Patent Description:
Psoriasis is a chronic relapsing/remitting, inflammatory, immune-mediated systemic skin disease. Plaque psoriasis (psoriasis vulgaris) is the most common type of psoriasis, characterized by sharply demarcated erythematous and scaly lesions/plaques with a silvery appearance (see <NPL> and <NPL>). In Western industrialized countries plaque psoriasis has a prevalence of around <NUM>% (<NPL>). Psoriasis is associated with an increased risk of developing serious clinical conditions such as inflammatory arthritis (psoriatic arthritis), and cardiovascular and other non-communicable diseases. Likewise, psoriasis causes great physical, emotional and social burden that lead to impairment in health-related quality of life (HRQoL) of people with psoriasis (see<NPL> and <NPL>).

Systemic therapy of psoriasis with fumarates, also known as fumaric acid esters (FAEs), was first investigated by a German scientist with psoriasis who experimented on himself and published his results in <NUM>. However, it was not until <NUM> that the first fumarate-based drug was approved in Germany for the treatment of severe psoriasis. This was marketed under the name of Fumaderm®, and represents a combination of DMF and three salts of monoethyl fumarate (see <NPL> and <NPL>).

DMF is considered the active component in the combination, as the monoethyl fumarate salts alone have not been shown to have significant clinical efficacy (<NPL>). The initial indication of Fumaderm® was expanded to include moderate disease in <NUM> (<NPL>). The use of FAEs in most of the European Union (EU) remained unlicensed until <NUM> when the EMA approved Skilarence®, an oral formulation of DMF, for the treatment of adults with moderate-to-severe chronic plaque psoriasis in need of systemic medical therapy (see <NPL> and the summary of product characteristics on Skilarence <NUM> gastro-resistant tablets, available from the European Medicines Agency (EMA)).

DMF is considered as a pro-drug for oral use to generate sufficient blood and tissue levels of monomethyl fumarate (MMF), the active in vivo metabolite. The immunomodulating and anti-inflammatory effects of MMF have not been clearly established (see<NPL>). However, without wishing to be bound by theory, it is thought that MMF effects are mainly due to the interaction with the intracellular reduced glutathione of cells directly involved in the pathogenesis of psoriasis. This interaction with glutathione leads to the inhibition of translocation into the nucleus and the transcriptional activity of the nuclear factor kappa-light-chain-enhancer of activated B-cells (NF-κB). The main activity of DMF and MMF is considered to be immunomodulatory, resulting in a shift in T helper (Th) cells from the Th1 and Th17 profile to a Th2 phenotype. The inflammatory cytokine production is reduced with induction of pro-apoptotic events, inhibition of keratinocyte proliferation, reduced expression of adhesion molecules, and diminished inflammatory infiltrate within psoriatic plaques (see the summary of product characteristics on Skilarence <NUM> gastro-resistant tablets, available from the European Medicines Agency (EMA)).

In a double-blind, placebo-controlled, non-inferiority phase III trial, the efficacy and safety of DMF (up to <NUM>/daily) was compared to Fumaderm® and placebo (<NPL>). A total of <NUM> patients diagnosed with moderate-to-severe psoriasis were randomized (<NUM>:<NUM>:<NUM>, respectively) to be treated for <NUM> weeks. The proportion of patients achieving an improvement (reduction) of ≥ <NUM>% in Psoriasis Area and Severity Index (PASI) score compared to the score at the visit of the first drug administration (PASI <NUM>) and the proportion achieving clear/almost clear in the Physician's Global Assessment (PGA) were used as co-primary endpoints. DMF was shown to be significantly superior to placebo and non-inferior to FAEs in both endpoints. The safety profile of DMF was also similar to FAEs, being gastrointestinal disorders the most frequently drug-related adverse events (AEs). No unexpected safety issues were detected. Based on this trial, DMF was approved by the EMA in June <NUM> to treat moderate-to-severe plaque psoriasis in patients in need of systemic drug treatment (see the summary of product characteristics on Skilarence <NUM> gastro-resistant tablets, available from the European Medicines Agency (EMA)).

However, despite the above, it has been recognised that there are a number of instances of FAE-resistant plaque psoriasis amongst the patients who are treated with these compounds, including many instances of DMF-resistant plaque psoriasis. Accordingly, there is a need for alternative therapeutic approaches for treating FAE-resistant plaque psoriasis.

It has been surprisingly discovered that anti-IL23 antibodies as herein defined, and in particular tildrakizumab, may be used to treat FAE-resistant plaque psoriasis. In particular, the present inventors have noted, based on unpublished results from the clinical trial described in Example <NUM>, that tildrakizumab is effective in treating FAE-resistant plaque psoriasis. Specifically, unpublished data from the above clinical trial indicates that some patients who were successfully treated with tildrakizumab during the clinical trials were suffering from FAE-resistant plaque psoriasis (i.e. had previously received an unsuccessful treatment with DMF). Any reference to a method of treatment practised on the human or animal body is to be interpreted as substances and compositions for use in such treatment.

The present invention therefore provides a method of treating FAE-resistant plaque psoriasis in a patient, said method comprising administering a therapeutically-effective amount of an anti-IL23 antibody to said patient, wherein said anti-IL23 antibody comprises a set of six CDRs, HCDR1, HCDR2, HCDR3, LCDR1, LCDR2 and LCDR3, wherein:.

The present invention further provides an anti-IL23 antibody for use in a method of treating of fumaric acid ester-resistant plaque psoriasis in a patient, wherein said method is as defined above.

The terms "treatment" and "treating" as used herein refers to the treatment of a disease or medical condition in a human patient which includes:.

The term "therapeutically effective amount" of a compound or composition as used herein means an amount sufficient to cure, alleviate or partially arrest the clinical manifestations of a given disease and its complications. An amount adequate to accomplish this is defined as "therapeutically effective amount". Effective amounts for each purpose will depend on the severity of the disease or injury as well as the weight and general state of the subject. It will be understood that determining an appropriate dosage may be achieved using routine experimentation, by constructing a matrix of values and testing different points in the matrix, which is all within the ordinary skills of a trained physician.

The plaque psoriasis to be treated in the present invention is a FAE-resistant plaque psoriasis (i.e. plaque psoriasis which is resistant or refractory to treatment with FAEs).

Typically, the FAE to which the plaque psoriasis is resistant is dimethyl fumarate (DMF). That is to say, typically the plaque psoriasis to be treated in the present invention is DMF-resistant plaque psoriasis.

The plaque psoriasis is preferably a moderate to severe plaque psoriasis. Thus, in one aspect, the plaque psoriasis is a moderate plaque psoriasis. In another aspect, the plaque psoriasis is a severe plaque psoriasis. The diagnosis and severity of plaque psoriasis can easily be made by a skilled person using standard test procedures. Suitable test procedures include the Psoriasis Area Severity Index (PASI), the Body Surface Area (BSA) assessment, the Physician's Global Assessments (PGA) - including the palmoplantar PGA (PPPGA) and the scalp PGA (ScPGA), the Pruritus - Visual Analogue Scale (Pruritus-VAS), the Medical Outcome Sleep Study (MOSS), the Dermatology Life Quality Index (DLQI), and the Skindex-<NUM>. Details on each of these procedures are provided below. PASI is preferred in the present invention for the diagnosing and assessing the severity of plaque psoriasis. Typically, the plaque psoriasis is moderate to severe plaque psoriasis if the patient exhibits a PASI score of ≥ <NUM>.

The plaque psoriasis may be present on any part of the body. Thus, it may be present on one or more of the head (including on the scalp) and neck, the upper extremities, the trunk, and the lower extremities.

The patient for treatment in the present invention is a patient having FAE-resistant plaque psoriasis. That is to say, the patient suffers from plaque psoriasis, and that plaque psoriasis is refractory or resistant to treatment with FAEs. Thus, the patient may also be described as one who is suffering from plaque psoriasis and is unresponsive (or does not respond) to treatment with FAEs. Such patients are known as "non-responder" patients. By "unresponsive" it is meant that the plaque psoriasis is not successfully treated by the FAE (i.e. the plaque psoriasis is resistant to treatment with the FAE). For the avoidance of doubt, the FAE may nevertheless cause a response not linked to treatment of plaque psoriasis in the patient. The present invention thus also provides a method of treating plaque psoriasis in a patient who is unresponsive (or does not respond) to treatment with FAEs, said method comprising administering a therapeutically-effective amount of an anti-IL23 antibody as defined herein to said patient.

The patient may be any subject having a FAE-resistant plaque psoriasis. However, typically, the patient is a human. Typically, the patient is an adult. Thus, the patient is preferably a human adult.

The patient may be afflicted with other forms of psoriasis in addition to plaque psoriasis, such as Guttate psoriasis, inverse psoriasis, pustular psoriasis, erythrodermic psoriasis and/or psoriatic arthritis. Alternatively, the patient may be suffering only from plaque psoriasis and not be suffering from other forms of psoriasis, such as those listed above.

A skilled person can easily determine whether plaque psoriasis is FAE-resistant, as discussed in further detail below. Patients who are unresponsive (or do not respond) to treatment with FAEs (i.e. "non-responder" patients) can be identified in the same manner.

Typically, FAE-resistant plaque psoriasis is a plaque psoriasis assessed as being resistant to treatment with a FAE, such as DMF, following a treatment regime with the treatment lasting for at least <NUM> weeks, preferably at least <NUM> weeks, more preferably at least <NUM> weeks, more preferably still at least <NUM> weeks, and most preferably at least <NUM> weeks, for example about <NUM> weeks. Preferably, the FAE-resistant plaque psoriasis is a plaque psoriasis assessed as being resistant to treatment with a FAE, such as DMF, following a treatment regime with the FAE DMF lasting for <NUM> weeks or about <NUM> weeks.

The treatment regime with a FAE, such as DMF, will typically be carried out according to a standard regime known to those skilled in the art (for example as defined in the summary of product characteristics on Skilarence <NUM> gastro-resistant tablets, available from the European Medicines Agency (EMA)).

The "standard regime" with DMF typically involves DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks (e.g. typically up to <NUM> weeks). A "standard regime" with an FAE other than DMF will typically be similar to that above.

A particularly preferred "standard regime" with DMF is carried out as follows:
In the first week, the patient takes DMF <NUM> once daily (one tablet in the evening). In the second week, the patient takes DMF <NUM> twice daily (one tablet in the morning and one in the evening). In the third week, the patient takes DMF <NUM> three times daily (one tablet in the morning, one at midday, and one in the evening). From the fourth week, treatment is switched to one tablet of DMF <NUM> in the evening. The patient then increases the daily DMF dose by one <NUM> tablet per week for the subsequent <NUM> weeks. Thus, in the fifth week, the patient takes DMF <NUM> twice daily (one tablet in the morning and one in the evening). In the sixth week, the patient takes DMF <NUM> three times daily (one tablet in the morning, one at midday, and one in the evening). In the seventh week, patient takes DMF <NUM> four times daily (one tablet in the morning, one at midday, and two in the evening). In the eighth week, the patient takes DMF <NUM> five times daily (two tablets in the morning, one at midday, and two in the evening). In the ninth week, the patient takes DMF <NUM> six times daily (two tablets in the morning, two at midday, and two in the evening) - the maximum daily dose. The maximum dosage is maintained for the subsequent weeks.

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, and the plaque psoriasis is resistant to treatment to a DMF treatment regime lasting for <NUM> weeks according to the standard regime recited above, which typically involves DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

The person skilled in the art can readily assess whether a plaque psoriasis is resistant (or refractory) to treatment with a FAE, such as DMF, through assessing the efficacy of the FAE treatment using standard test procedures. As noted above, suitable tests for diagnosing and assessing the severity of plaque psoriasis include the Psoriasis Area Severity Index (PASI), the Body Surface Area (BSA) assessment, the Physician's Global Assessments (PGA) - including the palmoplantar PGA (PPPGA) and the scalp PGA (ScPGA), the Pruritus - Visual Analogue Scale (Pruritus-VAS), the Medical Outcome Sleep Study (MOSS), the Dermatology Life Quality Index (DLQI), and the Skindex-<NUM>. Details on each of these procedures are given in turn below. However, PASI is preferred for assessing if a plaque psoriasis is FAE-resistant.

The PASI is a scoring method that can be used for the diagnosis, assessment and grading of the severity of psoriasis patients. The severity of the disease is calculated by scoring the signs of the disease (erythema, induration and scaling) for each body region. Overall scores range from <NUM> (no psoriasis) to <NUM> (the most severe disease).

A PASI <NUM> response, is defined as having an improvement (reduction) of ≥ <NUM>% in PASI scores compared to the baseline score. A PASI <NUM> response, is defined as having an improvement (reduction) of ≥ <NUM>% in PASI scores compared to the baseline score.

Typically, according to the present invention, plaque psoriasis is resistant to treatment with a FAE (such as DMF) if the patient does not exhibit a response of PASI <NUM> (i.e. does not exhibit an improvement (reduction) of ≥<NUM>% in PASI score compared to the baseline score) following a treatment regime with FAEs (i.e. typically a treatment regime as defined above). Thus, the plaque psoriasis is FAE-resistant if the patient exhibits a reduction of <<NUM>% in PASI score compared to the baseline score following a treatment regime with the FAE. Preferably, the reduction in PASI score in FAE-resistant plaque psoriasis is <<NUM>% compared to the baseline score, more preferably <<NUM>%, more preferably <<NUM>%, most preferably <<NUM>% or about <NUM>%. For the avoidance of doubt, some patients may exhibit an increase in PASI score following a treatment regime with the FAE, such as DMF.

Most preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient exhibits a reduction of <<NUM>% in PASI score compared to the baseline score following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

The BSA assessment measures the total area of the body affected by psoriasis. Using the surface of the hand to equal <NUM>% BSA, a physician may assess the total BSA affected. It is the patient's palm, including the five digits, that is used as the reference (to represent approximately <NUM>% of the total body surface area) and is used to repeatedly cover the lesions on the body. The physician totals the number of palms required and then estimates the percentage in each of the four body regions.

Typically, according to the present invention, the plaque psoriasis is FAE-resistant if the patient exhibits a reduction in BSA afflicted with plaque psoriasis of <<NUM>% compared to the baseline BSA afflicted with plaque psoriasis following a treatment regime with the FAE (i.e. typically a treatment regime as defined above). Preferably, the reduction in BSA afflicted with plaque psoriasis in FAE-resistant plaque psoriasis is <<NUM>% compared to the baseline BSA afflicted with plaque psoriasis, more preferably <<NUM>%, more preferably <<NUM>%, most preferably <<NUM>% or about <NUM>%. For the avoidance of doubt, some patients may exhibit an increase in the baseline BSA afflicted with plaque psoriasis following a treatment regime with the FAE, such as DMF.

Most preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient exhibits a reduction in the baseline BSA afflicted with plaque psoriasis of <<NUM>% compared to the baseline BSA afflicted with plaque psoriasis following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

The PGA is an assessment by a physician of the overall disease severity at the time of evaluation. The PGA is a <NUM>-point scale ranging from <NUM> (clear) to <NUM> (severe), incorporating an assessment of the severity of the three primary signs of the disease: erythema, scaling and plaque elevation. When making the assessment of overall severity, the physician should factor in areas that have already been cleared (i.e., have scores of <NUM>) and not just evaluate remaining lesions for severity, i.e., the severity of each sign is averaged across all areas of involvement, including cleared lesions.

The palmoplantar PGA (PPPGA) is an assessment by the physician of the palmoplantar disease severity at the time of evaluation. The PPPGA is a <NUM>-point scale ranging from <NUM> (clear) to <NUM> (severe).

Likewise, the scalp PGA (ScPGA) is an assessment by the physician of the scalp disease severity at the time of evaluation. The ScPGA is also <NUM>-point scale ranging from <NUM> (clear) to <NUM> (severe).

Typically, according to the present invention, the plaque psoriasis is FAE-resistant if the patient exhibits maintained or increased PGA, PPPGA and/or ScPGA scores compared to the baseline PGA, PPPGA and/or ScPGA scores following a treatment regime with the FAE (i.e. typically a treatment regime as defined above).

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient exhibits maintained or increased PGA, PPPGA and/or ScPGA scores compared to the baseline PGA, PPPGA and/or ScPGA scores following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

The pruritus-VAS is a single-item continuous scale comprised of a <NUM> (<NUM>) horizontal/vertical line anchored by two verbal descriptors, one for each symptom extreme. For pruritus intensity, the scale is anchored by "no pruritus" (score of <NUM>) and "worst imaginable pruritus" (score of <NUM>).

Typically, according to the present invention, the plaque psoriasis is FAE-resistant if the patient reports a maintained or increased pruritus-VAS score compared to the baseline pruritus-VAS score following a treatment regime with the FAE (i.e. typically a treatment regime as defined above).

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient reports a maintained or increased pruritus-VAS score compared to the baseline pruritus-VAS score following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

The MOSS questionnaire consists of <NUM> items leading to <NUM> subscales or domains: sleep disturbance, sleep adequacy, daytime sleepiness, 'supposed or known' snoring, being awakened by shortness of breath or by a headache, and quantity of sleep. Subscales are standardised to yield scores from zero to <NUM>, with the exception of sleep quantity. Higher scores on the MOSS reflects more of the attribute indicated by the subscale name.

Typically, according to the present invention, the plaque psoriasis is FAE-resistant if the patient reports maintained or increased MOSS scores on the subscales of sleep disturbance, daytime sleepiness, 'supposed or known' snoring, and/or being awakened by shortness of breath or by a headache compared to the baseline MOSS scores following a treatment regime with the FAE (i.e. typically a treatment regime as defined above).

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient reports maintained or increased MOSS scores on the subscales of sleep disturbance, daytime sleepiness, 'supposed or known' snoring, and/or being awakened by shortness of breath or by a headache compared to the baseline MOSS scores following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

Similarly, according to the present invention, the plaque psoriasis is FAE-resistant if the patient reports maintained or decreased MOSS scores on the subscales of sleep adequacy and sleep quantity compared to the baseline MOSS scores following a treatment regime with the FAE (i.e. typically a treatment regime as defined above).

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient reports maintained or decreased MOSS scores on the subscales of sleep adequacy and sleep quantity compared to the baseline MOSS scores following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

Patients are asked about the impact of their disease and the respective treatment on their lives. The DLQI score is calculated by summing the score of each question resulting in a maximum of <NUM> and a minimum of <NUM>. The higher the score, the more quality of life is impaired. The DLQI can also be expressed as a percentage of the maximum possible score of <NUM>.

Typically, according to the present invention, the plaque psoriasis is FAE-resistant if the patient exhibits a maintained or increased DLQI score compared to the baseline DLQI score following a treatment regime with the FAE (i.e. typically a treatment regime as defined above).

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient exhibits a maintained or increased DLQI score compared to the baseline DLQI score following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

Skindex-<NUM> is a further dermatological instrument to measure dermatology-specific health-related quality of life (HRQoL). The <NUM>-item Skindex questionnaire is divided into three domains: questions related to the patients' symptoms (<NUM>-<NUM>), emotions (<NUM>-<NUM>), and functioning (<NUM>-<NUM>). Each question asks the patient to quantify how much a specific aspect of their skin condition bothered them in the week prior to administration of the Skindex-<NUM>. The questions are answered on a scale from <NUM> (never bothered) to <NUM> (always bothered) with a total possible score ranging from <NUM> (best HRQoL) to <NUM> (worst HRQoL). Each item is then transformed to a linear scale from <NUM> to <NUM>.

Typically, according to the present invention, the plaque psoriasis is FAE-resistant if the patient exhibits a maintained or increased Skindex-<NUM> score compared to the baseline Skindex-<NUM> score following a treatment regime with the FAE (i.e. typically a treatment regime as defined above).

Preferably, therefore, the FAE-resistant plaque psoriasis is DMF-resistant plaque psoriasis, in which the patient exhibits a maintained or increased Skindex-<NUM> score compared to the baseline Skindex-<NUM> score following a DMF treatment regime lasting for <NUM> weeks and involving DMF <NUM> once daily in the first week, DMF <NUM> twice daily in the second week, DMF <NUM> three times daily in the third week, DMF <NUM> once daily in the fourth week, DMF <NUM> twice daily in the fifth week, DMF <NUM> three times daily in the sixth week, DMF <NUM> four times daily in the seventh week, DMF <NUM> five times daily in the eighth week, and DMF <NUM> six times daily in the ninth and subsequent weeks.

Examples of anti-IL-<NUM> antibodies which may be used in the practice of the present invention, as well as methods for generating the same, are described in <CIT> (e.g. the humanized 13B8-b antibody and the antigen-binding fragments thereof) which is incorporated herein by reference in its entirety, and particularly with respect to the discussion of antibody h13B8b and the antigen binding fragments thereof. Preferably, the antibody for use in the present invention is a humanized antibody.

An antibody or antigen binding fragment thereof for use in the invention may comprise a set of six CDRs, HCDR1, HCDR2, HCDR3, LCDR1, LCDR2 and LCDR3, wherein:.

Methods and techniques for identifying CDRs within HCVR and LCVR sequences will be known to those skilled in the art. Conventions for identifying CDRs include, for example, the Kabat definition, the Chothia definition, and the AbM definition. At a general level, the Kabat definition is based on sequence variability, the Chothia definition is based on the location of the structural loop regions, and the AbM definition is a compromise between the Kabat and Chothia approaches. See, e.g. <NPL>); <NPL>; and <NPL>. Public databases are also available to identify CDR sequences.

Preferably, the antibody or antigen binding fragment thereof comprises a HCVR/LCVR amino acid sequence pair wherein the HCVR has at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>% or at least <NUM>% sequence identity with a HCVR having an amino acid sequence of SEQ ID No. <NUM>, or wherein the LCVR has at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>% or at least <NUM>% sequence identity with a LCVR having an amino acid sequence of SEQ ID No. <NUM>. In some embodiments, the antibody or antigen binding fragment thereof comprises a HCVR/LCVR amino acid sequence pair wherein the HCVR has at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>% or at least <NUM>% sequence identity with a HCVR having an amino acid sequence of SEQ ID No. <NUM>, and wherein the LCVR has at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>%, at least <NUM>% or at least <NUM>% sequence identity with a LCVR having an amino acid sequence of SEQ ID No. <NUM>.

Sequence identity of amino acid sequences is typically measured using sequence analysis software. Protein analysis software matches similar sequences using measures of similarity assigned to various substitutions, deletions and other modifications, such as conservative amino acid substitutions. For instance, GCG software contains programs such as GAP and BESTFIT which can be used with default parameters to determine sequence identity between different amino acid sequences (see, e.g., GCG Version <NUM>). Amino acid sequences also can be compared using FASTA with default or recommended parameters, a program in GCG Version <NUM>. FASTA (e.g., FASTA2 and FASTA3) provides alignments and percent sequence identity of the regions of the best overlap between the query and search sequences. Another algorithm is the computer program BLAST, especially BLASTP or TBLASTN, using default parameters (see e.g. <NPL> and <NPL>, both of which are incorporated herein by reference).

An antibody or antigen binding fragment thereof for use in the present invention may comprise a HCVR comprising the amino acid sequence of SEQ ID No. <NUM> or a LCVR comprising the amino acid sequence SEQ ID No. <NUM>. Preferably, an antibody or antigen binding fragment thereof for use in the invention comprises a HCVR/LCVR amino acid sequence pair of SEQ ID No. <NUM>/ SEQ ID No. <NUM>.

Antibodies for use in the invention may be selected from any class of immunoglobulins, including IgM, IgG, IgD, IgA, and IgE. Preferably, the antibody is an IgG antibody. Any isotype of IgG can be used, including IgG1, IgG2, IgG3, and IgG4. Variants of the IgG isotypes are also contemplated. The antibody may comprise sequences from more than one class or isotype.

An antibody for use in the invention may comprise a γ1, γ2, γ3, or γ4 human heavy chain constant region or a variant thereof. An antibody for use in the invention may comprises a lambda or a kappa human light chain constant region.

An antibody or antigen binding fragment thereof for use in the present invention may comprise a heavy chain amino acid sequence of SEQ ID No. <NUM> or a light chain amino acid sequence of SEQ ID No. <NUM>. In some embodiments, the antibody or antigen binding fragment thereof may comprise a heavy chain amino acid sequence of SEQ ID No. <NUM> and a light chain amino acid sequence of SEQ ID No.<NUM>.

The antibody for use in the present invention may be tildrakizumab or an antigen binding fragment thereof. Antibodies (including antigen binding fragments thereof) are also envisaged for use in the invention which comprise the six CDRs of tildrakizumab; an HCVR/LCVR pair of tildrakizumab; or the heavy chain and light chain of tildrakizumab.

As was mentioned above, tildrakizumab is a high-affinity, humanised immunoglobulin (Ig) G1/κ monoclonal antibody specifically targeting the p19 subunit of IL-<NUM> (<NPL>), useful for the treatment of adults with moderate-to-severe plaque psoriasis who are candidates for systemic therapy (see the summary of product characteristics on Ilumetri, available from the European Medicines Agency (EMA)). Following completion of the phase III reSURFACE clinical trial programme, tildrakizumab was approval by the EMA in September <NUM>.

The term "antibody" as referred to herein includes whole antibodies as well as antigen binding fragments (i.e., "antigen-binding portion") or single chains thereof. As used herein, the term "antigen binding fragment thereof" and the like includes a reference to a fragment of an antibody that retains the ability to bind to and antagonise hIL-<NUM>. Examples of antibody fragments include Fab, Fab', F(ab')<NUM>, and Fv fragments; diabodies; linear antibodies; single-chain antibody molecules, e.g., sc-Fv; and multispecific antibodies formed from antibody fragments (see for example <NPL>; <NPL>). The methods for creating and manufacturing these antibody fragments are well known in the art (see for example <NPL>). Antibody fragments for use in the present invention include the fragments described in <CIT> in particular the antibody fragments of antibody h13B8b.

In general, the antibodies (and antigen-binding fragments thereof) for use in the present invention function by binding to and antagonizing human IL-<NUM>. Antibody affinities (e.g. for human IL-<NUM>) may be determined using standard analysis. In some embodiments, affinity may be measured by surface plasmon resonance, e.g. BIAcore or solution-affinity ELISA (e.g. at <NUM> or <NUM>). In one embodiment, affinity is measured by surface plasmon resonance (e.g. BIAcore SPR) at <NUM>. KD values of <NUM>-<NUM> pM and <NUM>-<NUM> pM have been determined by BIAcore for tildrakizumab in <CIT> which is incorporated herein by reference (tildrakizumab is referred to as h13B8-b in <CIT>).

Preferred antibodies and antigen binding fragments are those which bind human IL-<NUM> with an affinity constant (KD) value of no more than about <NUM>×<NUM>-<NUM> M; preferably no more than about <NUM>×<NUM>-<NUM>M; more preferably no more than about <NUM>×<NUM>-<NUM> M; and most preferably no more than about <NUM>×<NUM>-<NUM> M or even <NUM>×<NUM>-<NUM> M. In certain embodiments, the antibodies or antigen-binding fragments for use in the invention bind human IL-<NUM> with a KD value less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, or less than about <NUM> pM.

These affinity constant (KD) values may be applied to the antibody sequences described herein for use in the present invention. For example, an antibody or antigen-binding fragment thereof may comprise a set of six CDRs as defined herein and a KD for hIL-<NUM> as determined by SPR (Biacore) at <NUM> of less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM>, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, less than about <NUM> pM, or less than about <NUM> pM.

Typically, the anti-IL-<NUM> antibody as herein defined, such as tildrakizumab, for use in the invention is administered to the patient by injection. Preferably, the injection is a subcutaneous injection.

Preferably, the anti-IL-<NUM> antibody as herein defined, such as tildrakizumab, is administered to the patient in an aqueous composition comprising L-histidine, L-histidine hydrochloride monohydrate, polysorbate <NUM>, sucrose and the anti-IL23 antibody. A particularly preferred composition comprises L-Histidine, L-Histidine hydrochloride monohydrate, polysorbate <NUM>, sucrose, <NUM> of the anti-IL23 antibody (e.g. tildrakizumab) and water for injection in a total volume of <NUM>.

Typically, the anti-IL-<NUM> antibody as herein defined, such as tildrakizumab, is administered to the patient in an amount of <NUM>. However, in patients having certain characteristics (such as a high disease burden or a body weight of greater than <NUM>), the anti-IL-<NUM> antibody as herein defined, such as tildrakizumab, is preferably administered to the patient in an amount of <NUM>.

The anti-IL-<NUM> antibody as herein defined, such as tildrakizumab, may be administered at a frequency determined by a person skilled in the art. However, in a preferred embodiment, the anti-IL-<NUM> antibody as herein defined, such as tildrakizumab, is administered to the patient once in week <NUM>, once in week <NUM>, and then once every subsequent twelfth week.

The anti-IL-<NUM> antibody may be administered together with an additional medication and/or the administration carried out in parallel with a separate treatment method for the treatment of plaque psoriasis or other types of psoriasis.

Such medications and/or treatments are well known to the skilled person, and include topical treatments (such as corticosteroids, coal tar, anthracene derivatives, vitamin A and D derivatives, and salicylic acid preparations), phototherapy (such as photochemotherapy (e.g., Psoralen-UVA), phototherapy (e.g., UVA, UVB, UVB311), blue light therapy, and tanning salon or home-administered UVB), conventional systemic anti-psioratic drugs different to fumarate-based drugs (such as systemic corticosteroids, cyclosporine, methotrexate, mycophenolate mofetil, azathioprine, leflunomide, tacrolimus and apremilast), and other treatments (such as tumour necrosis factor-alpha inhibitors, IL-<NUM> inhibitors, IL-17R inhibitors, IL-<NUM>/<NUM> p40 inhibitors, IL-23p19 inhibitors or experimental biological products, and other medications affecting the immune function e.g. cytostatics).

Alternatively, the anti-IL-<NUM> antibody may be administered with additional medications or separate treatments for plaque psoriasis or other types of psoriasis.

The following non-limiting Examples illustrate the invention.

reSURFACE <NUM> was a <NUM>-part phase III, double-blind, randomized controlled trial to compare the safety and efficacy of tildrakizumab with placebo in <NUM> adult patients with chronic plaque psoriasis over <NUM> weeks (<NPL>). Part I spanned from week <NUM> to week <NUM>, part II spanned from week <NUM> to week <NUM>, and part III spanned from week <NUM> to week <NUM>. Patients in part I were randomly assigned (<NUM>:<NUM>: <NUM>) at baseline to tildrakizumab <NUM>, tildrakizumab <NUM>, or placebo at baseline and week <NUM>. In part II, patients received another dose at week <NUM> and those in placebo groups were re-randomized (<NUM>:<NUM>) to either tildrakizumab <NUM> or <NUM>. In part III, those who responded (PASI ≥<NUM>) and partial responders (PASI ≥<NUM>-<<NUM>) to tildrakizumab were re-randomized at week <NUM> to continue with the treatment or given a different dose of tildrakizumab or a placebo every <NUM> weeks until week <NUM>.

The proportions of tildrakizumab groups (<NUM>, <NUM>%; <NUM>, <NUM>%) achieving a PASI <NUM> response at week <NUM> were higher than in the placebo group (<NUM>%, p<<NUM>). The frequencies of tildrakizumab groups (<NUM>, <NUM>%; <NUM>, <NUM>%) achieving a PGA of "clear" or "minimal" at week <NUM> were higher than in the placebo group (<NUM>%, p<<NUM>). Patients who initially received placebo and transitioned to tildrakizumab had a steady increase in clinical response until week <NUM>, when the response plateaued to similar levels of patients taking tildrakizumab from baseline. The frequencies of the tildrakizumab groups (<NUM>, <NUM>% and <NUM>% respectively; <NUM>, <NUM>% and <NUM>%, respectively) achieving PASI <NUM> and PASI <NUM> at week <NUM> were higher than in the placebo group (<NUM>% and <NUM>% respectively, p<<NUM>). The proportions of patients achieving a Dermatology Life Quality Index (DLQI) of <NUM> or <NUM> at week <NUM> in the tildrakizumab groups (<NUM>, <NUM>%; <NUM>, <NUM>%) were higher than in the placebo group (<NUM>%, p<<NUM>). In the tildrakizumab <NUM> group, <NUM>% of responders and <NUM>% of partial responders at week <NUM> maintained or achieved a PASI <NUM> response at week <NUM>. In the tildrakizumab <NUM> group, <NUM>% of responders and <NUM>% of partial responders at week <NUM> maintained or achieved a PASI <NUM> response from weeks <NUM> to <NUM>.

reSURFACE <NUM> was a <NUM>-part phase III, double-blind, randomized controlled trial to compare the safety and efficacy of tildrakizumab with etanercept or placebo in <NUM> adult patients with chronic plaque psoriasis over <NUM> weeks (<NPL>). Part I spanned from week <NUM> to week <NUM>, part II spanned from week <NUM> to week <NUM>, and part III spanned from week <NUM> to week <NUM>. Patients were randomly assigned (<NUM>:<NUM>:<NUM>:<NUM>) at baseline to receive tildrakizumab <NUM>, tildrakizumab <NUM>, or placebo SC at baseline and week <NUM>, or etanercept <NUM> twice weekly. In part II patients received another dose at week <NUM>, both tildrakizumab groups received the same dose, whereas the placebo group was re-randomized (<NUM>:<NUM>) to either tildrakizumab <NUM> or tildrakizumab <NUM>. The etanercept group downgraded to once weekly. In part III, responders and partial responders to tildrakizumab at week <NUM> were randomized to continue the same treatment, switched to a different dose of tildrakizumab, or given a placebo every <NUM> weeks until week <NUM>.

At week <NUM> of reSURFACE <NUM> trial: the proportions of patients achieving a PASI <NUM> response in the tildrakizumab groups (<NUM>, <NUM>%; <NUM>, <NUM>%) were greater than in the placebo (<NUM>%, p<<NUM>) and etanercept (<NUM>%, p=<NUM>) groups. The frequencies of tildrakizumab groups (<NUM>, <NUM>%; <NUM>, <NUM>%) achieving "clear" or "minimal" PGA were greater than the placebo group (<NUM>%, p<<NUM>). The frequency of PGA response in the tildrakizumab <NUM>-mg group (<NUM>%) was higher compared with etanercept (<NUM>%, p=<NUM>). The frequencies of achieving PASI <NUM> and PASI <NUM> were higher in both tildrakizumab groups (<NUM>, <NUM>% and <NUM>%; <NUM>, <NUM>% and <NUM>%) than in placebo (<NUM>% and <NUM>%, p<<NUM>) and etanercept (<NUM>% and <NUM>%, p<<NUM>) groups. The proportions of patients achieving a DLQI of <NUM> or <NUM> were higher in the tildrakizumab groups (<NUM>, <NUM>%; <NUM>, <NUM>%) than in the placebo group (<NUM>%, p<<NUM>); <NUM>% of patients in the tildrakizumab <NUM>-mg group achieved a DLQI of <NUM> or <NUM> compared with <NUM>% in the etanercept group (p=<NUM>). In addition, in the tildrakizumab <NUM> group, <NUM>% of responders and <NUM>% of partial responders at week <NUM> maintained or achieved a PASI <NUM> response at week <NUM>. In the tildrakizumab <NUM> group, <NUM>% of responders and <NUM>% of partial responders at week <NUM> maintained or achieved a PASI <NUM> response at week <NUM>.

A number of the patients who were successfully treated with tildrakizumab during these clinical trials were suffering from FAE-resistant plaque psoriasis. That is to say, those patients had previously received unsuccessful treatments with DMF, but nevertheless were treated successfully with tildrakizumab. Thus, tildrakizumab was shown to provide an effective therapy for patients having fumaric acid ester-resistant plaque psoriasis.

This is a multicentre, randomized, parallel group, open label phase IV clinical study in patients with moderate-to-severe chronic plaque psoriasis. The main aim of the study is to evaluate the efficacy, safety and tolerability of tildrakizumab in non-responder patients from DMF after <NUM> weeks of treatment. The study consists in two parts. Part <NUM> will include a Screening Period of four weeks (one visit) and the first <NUM> weeks of the Treatment Period (seven visits: three virtual visits and four on-centre visits). Part <NUM> will include the last <NUM> weeks of the Treatment Period (three visits) and a Safety Follow-up Period that includes one visit four weeks after the last study drug medication dose. In addition, patients who have received tildrakizumab will have another visit during the Safety Follow-up Period, <NUM> weeks after the last study drug medication dose. Thus, for most of patients receiving only DMF the study will include a total of <NUM> visits (three virtual visits and nine on-centre visits) during a period of <NUM> weeks. Likewise, for patients receiving DMF and tildrakizumab the study will include a total of <NUM> visits (three virtual visits and <NUM> on-centre visits) during a period of <NUM> weeks.

Overall, approximately <NUM> patients will be randomized across <NUM> study centres in Europe (approximately <NUM>-<NUM> patients per centre); in at least Germany, Netherlands and United Kingdom (UK). Adult male and female patients will be eligible to participate in the study if they are FAEs and biologic treatment-naive. Non-treatment-naive patients must follow the a wash-out period according to the current or last treatment for psoriasis.

In the Treatment Period, eligible patients will be randomized (<NUM>:<NUM>) to receive either DMF standard scheme or DMF optimised scheme from Baseline to Week <NUM>. During study Part <NUM> the use of short courses of add-on mild or moderate potency topical corticosteroids (TCS) will be allowed from Baseline Visit up to Week <NUM>. The use of TCS should have a clinical justification and the complete TCS treatment information must be documented. Patients achieving a PASI <NUM> response (responder patients) at Week <NUM> will discontinue the study and they will be treated at the judgment of the Investigator or according to the centre's routine clinical practice. Patients failing to achieve a PASI <NUM> response but achieving a PASI <NUM> response (partial responder patients) at Week <NUM> will continue with DMF treatment until Week <NUM>. However, for patients continuing with DMF treatment and who do not achieve a clinically meaningful response at Week <NUM> at judgment of the Investigator, add-on mild or moderate potency TCS will be allowed from Week <NUM> to Week <NUM>. The use of TCS should have a clinical justification and the complete TCS treatment information must be documented. Patients failing to achieve a PASI <NUM> response (non-responder patients) at Week <NUM> will be treated with tildrakizumab until Week <NUM>. The primary efficacy endpoint of the study will be evaluated at Week <NUM> in these patients.

Tildrakizumab dose will be <NUM>/<NUM> administered as SC injection at Week <NUM>, <NUM> and <NUM> as indicated by the SmPC. To improve tolerability, DMF dose will be taken orally and will be gradually increased up to a maximum of <NUM>/day. For the standardised scheme group, DMF dosing uptitration will follow the SmPC indication while for the optimised scheme group, uptitration will follow an optimised version of it.

Besides the Treatment Period, all patients will undergo a Screening Period and a Safety Follow-Up Period. The duration of the Treatment Period will vary among patients. Responder patients at Week <NUM> will participate in the study for approximately <NUM> weeks, partial patients will be participate for approximately <NUM> weeks, and non-responder patients will be participate for approximately <NUM> weeks.

The expected duration of the trial is <NUM> months.

All patients included in the study will start DMF treatment, although patients will be randomized to receive two different uptitration dosing schemes. Once all the patients have reached the DMF maximum tolerated daily dose, the treatment response will be assessed and patients with a poor treatment response will start treatment with tildrakizumab.

No type of control group has been included in the design of this study as this is an open phase IV clinical study where the therapeutic indication, posology and method of administration will follow the SmPCs of DMF and tildrakizumab.

In this phase IV clinical study, the patient population will be included following the therapeutic indications for which DMF and tildrakizumab have been approved for the EMA: adults with moderate-to-severe plaque psoriasis who are candidates for systemic therapy.

In this phase IV clinical study, patients will be treated with DMF and tildrakizumab following the posology and method of administration in the SmPC of each study drug (subject to the parallel use of an optimised treatment protocol for DMF in some patients).

The study will be conducted in approximately <NUM> study centres in Europe, in at least Germany, Netherlands and UK. It is anticipated that approximately <NUM> patients will be randomized into the study. Approximately <NUM>-<NUM> patients will be randomized per centre. Thus, <NUM> patients will be treated with DMF in the Part <NUM> of the study (<NUM> patients in each DMF scheme), and assuming that <NUM>% of these patients will be non-responders at Week <NUM> and a drop-out rate of <NUM>% during the Part <NUM>, it is anticipated that <NUM> patients will be treated with tildrakizumab in the Part <NUM> of the study.

Patients eligible for inclusion in this study have to fulfil all of the following criteria:.

Patients will begin DMF treatment with a low initial dose with subsequent gradual increases. Although two different uptitration schemes will be followed during the DMF treatment, at the end study Part <NUM> all patients will have reached the DMF maximum tolerated daily dose.

The DMF standardised scheme will follow the SmPC posology. As such, in the first week, patients will take DMF <NUM> once daily (one tablet in the evening). In the second week, patients will take DMF <NUM> twice daily (one tablet in the morning and one in the evening). In the third week, patients will take DMF <NUM> three times daily (one tablet in the morning, one at midday, and one in the evening). From the fourth week, treatment is switched to only one tablet of DMF <NUM> in the evening. Patients will then increase DMF dose by one <NUM> tablet per week at different times of day for the subsequent <NUM> weeks. Thus, in the fifth week, patients will take DMF <NUM> twice daily (one tablet in the morning and one in the evening). In the sixth week, patients will take DMF <NUM> three times daily (one tablet in the morning, one at midday, and one in the evening). In the seventh week, patients will take DMF <NUM> four times daily (one tablet in the morning, one at midday, and two in the evening). In the eighth week, patients will take DMF <NUM> five times daily (two tablets in the morning, one at midday, and two in the evening). In the ninth week, patients will take DMF <NUM> six times daily (two tablets in the morning, two at midday, and two in the evening) - the maximum daily dose. The maximum dosage will be maintained for the subsequent weeks.

In the optimised DMF treatment scheme, in the first week, patients will take DMF <NUM> daily (one DMF <NUM> tablet in the morning and one in the evening). In the second week, patients will take DMF <NUM> daily (two DMF <NUM> tablets in the morning and two in the evening). In the third week, patients will take DMF <NUM> daily (three DMF <NUM> tablets in the morning and three in the evening). From the fourth week onwards, treatment is switched to DMF <NUM> tablets. In the fourth week, patients will take DMF <NUM> daily (one DMF <NUM> tablet in the morning and one in the evening). In the fifth week, patients will take DMF <NUM> daily (one DMF <NUM> tablet in the morning and two in the evening). From the sixth to eighth week, patients will take DMF <NUM> daily (two DMF <NUM> tablets in the morning and two in the evening). If a PASI reduction of ≥ <NUM>% is achieved at Week <NUM>, no further increase of dosage is necessary. By contrast, if the PASI reduction is <<NUM>% at Week <NUM>, uptitration will continue with DMF <NUM> daily (two DMF <NUM> tablets in the morning and three in the evening) in the ninth week and then DMF <NUM> daily (three DMF <NUM> tablets in the morning and three in the evening) from the tenth week onwards.

For both DMF treatment schemes, in case of significant individual intolerability to DMF at any time during the study, the dose should be reduced to the last tolerated dose. This dose should be maintained for at least seven days before a new dose increase is attempted.

If treatment success, defined as a PASI <NUM> response, is achieved before the maximum dose of <NUM> at Week <NUM> is reached in the standard scheme, no further increase of dose is necessary. Likewise, if treatment success is achieved before the maximum dose, <NUM> at Week <NUM> or <NUM> at Week <NUM>, is reached in the optimised scheme, no further increase of dose is necessary. After clinically relevant improvement of the skin lesions has been achieved, Investigators should consider a gradual reduction of the daily dose of DMF to the maintenance dose required by the patient.

During the Treatment Period, gradual dose adjustments may be tailored on a patient by patient basis using the dosage strengths available in order to mitigate AEs.

All DMF modifications should be collected.

During the treatment with DMF, a complete blood count with differential should be performed every <NUM> months as is indicated in the SmPC. Action is needed when lymphocyte levels drop below <NUM> × <NUM><NUM> cells/L, when leukocyte levels drop below <NUM> × <NUM><NUM> cells/L, and when there is any clinically-relevant change in hepatic enzymes or in renal function and urine status.

In patients switching from DMF to tildrakizumab at week <NUM>, blood tests will be performed to monitor leukocyte and lymphocyte counts.

In patients with certain characteristics (e.g. high disease burden, body weight ≥ <NUM>) <NUM> may provide greater efficacy. Investigators will be allowed to prescribe either of the two doses depending on the individual patient's characteristics at the beginning of the Part <NUM>. Once a dose is chosen and treatment with tildrakizumab is initiated, dose changes (e.g. from <NUM> to <NUM> or vice versa) will not be allowed.

DMF and tildrakizumab will be administrated according to the SmPC of each study drug.

DMF is for oral use and tablets must be swallowed whole with fluid during or immediately after a meal. The coating of the gastro-resistant tablets is designed to prevent gastric irritation. Therefore, the tablets should not be crushed, divided, dissolved or chewed. Regarding the daily dose, an uptitration will take place during the first weeks of the treatment in the Part <NUM> and two uptitration dosing schemes will be followed according to the treatment group.

Tildrakizumab is administered by SC injection. Injection sites should be alternated. Tildrakizumab should not be injected into areas where the skin is affected by plaque psoriasis or is tender, bruised, red, hard, thick, or scaly. The pre-filled syringe must not be shaken. Each pre-filled syringe is for single use only. The full amount of tildrakizumab should be injected according to the instructions for use provided in the package leaflet. While patients are in the trial, tildrakizumab will be administered by the Investigator or his/her designate during the visit.

The following sections indicate the timing of all study events.

This period will start with the signature of the ICF, then will follow with Visit <NUM> (Screening Visit), and will end at the Visit <NUM> (Baseline Visit).

Prior to signature of the ICF, Investigators will evaluate eligibility of patients for entry in the trial by comparing past and current medical status, as documented in the patient's medical records, to the inclusion/exclusion criteria of the study (Section <NUM>).

Eligible patients will receive a detailed description of all activities and requirements before signing the ICF to ensure their understanding and compliance with sample collection and clinical examinations.

Patients who require a washout period from prohibited concomitant treatments should be seen and sign the ICF prior to the Screening Visit, to ensure the necessary washout before.

No trial assessments will be performed on that date and the Screening Visit will be scheduled according to the washout length required for the specific medication stopped.

At Visit <NUM>, the following activities and assessments will be performed within <NUM> days prior to Visit <NUM>:.

Activities and assessments during Part <NUM> and Part <NUM> of Treatment Period are detailed below. Day <NUM> is considered to be the first day of study drug administration. Window period for each visit is ± <NUM> days.

Visit <NUM> (Week <NUM>) belongs to Part <NUM> Treatment Period, however, the study drug administration at this visit is considered to be the first study drug administration of the Part <NUM> Treatment Period.

Only in patients with palmar/plantar or scalp involvement the Palmoplantar and Scalp PGA assessments will be performed, respectively.

At Visit <NUM>, the following activities and assessments will be performed:.

Visits <NUM>, <NUM> and <NUM> are virtual visits and the following activities and assessments will be performed:.

At Visit <NUM> will be on Week <NUM> for patients in tildrakizumab treatment or on Week <NUM> in patients in DMF treatment. The following activities and assessments will be performed:.

A Safety Follow-Up Period will begin after Visit <NUM> (Week <NUM>) for completed patients, Visit <NUM> for responder patients at Week <NUM> and the premature discontinuation visit (when applicable), in order to check if any new AEs have occurred and to do follow-up of any previous AEs that was ongoing. This information will be recorded.

Visit <NUM> will be performed in all patients, <NUM> weeks after the last dose administration of the study drugs, and the following activity will be performed:.

Visit <NUM> will be performed in patients receiving tildrakizumab, <NUM> weeks after the last dose administration of the study drug, and the following activity will be performed:.

An unscheduled visit will be performed in female patients with a positive urine pregnancy test in order to perform a serum pregnancy test.

The following outcomes of interest will be measured:.

Approximately <NUM> patients will be enrolled in this trial to be treated DMF during <NUM> weeks. Assuming that <NUM>% of patients treated with DMF will be non-responders at Week <NUM> and considering a drop-out rate of <NUM>% during the first <NUM> weeks of the trial, it is predicted that there will be <NUM> non-responder patients still in treatment at Week <NUM>.

Approximately <NUM> patients will be enrolled in this trial to be treated DMF during <NUM> weeks. Assuming that <NUM>% of patients treated with DMF will be non-responders at Week <NUM> and considering a drop-out rate of <NUM>% during the first <NUM> weeks of the trial, there will be <NUM> non-responder patients still in treatment at Week <NUM>.

A total sample size of <NUM> non-responder patients at Week <NUM> will allow the estimation of around <NUM>% of patients treated with tildrakizumab achieving a PASI <NUM> response at Week <NUM>, with a precision of <NUM>% with a <NUM>% Confidence Interval (CI); i.e. a <NUM>% CI for the proportion of patients with a PASI <NUM> response at week <NUM> of <NUM>% - <NUM>%.

Claim 1:
An anti-IL23 antibody for use in a method of treating fumaric acid ester-resistant plaque psoriasis in a patient, said method comprising administering a therapeutically-effective amount of the anti-IL23 antibody to said patient, wherein said anti-IL23 antibody comprises a set of six CDRs, HCDR1, HCDR2, HCDR3, LCDR1, LCDR2 and LCDR3, wherein HCDR1 has the amino acid sequence of SEQ ID NO: <NUM>; HCDR2 has the amino acid sequence of SEQ ID NO: <NUM>; HCDR3 has the amino acid sequence of SEQ ID NO: <NUM>; LCDR1 has the amino acid sequence of SEQ ID NO: <NUM>; LCDR2 has the amino acid of SEQ ID NO: <NUM>; and LCDR3 has the amino acid sequence of SEQ ID NO: <NUM>.