Study to Evaluate APVO210 in Healthy Subjects, Patients With Psoriasis, and Patients With Ulcerative Colitis

Phase 1 study in 2 stages with 2 expansion cohorts. The first stage is a single ascending dose (SAD) study of APVO210 in healthy volunteers. The second stage is a multiple ascending dose (MAD) study of APVO210 in healthy volunteers. Two expansion cohorts evaluate multiple doses of APVO210 in psoriasis patients and ulcerative colitis patients.


Eligibility Criteria:
Inclusion Criteria:

Main Inclusion Criteria:

* Age 18 to 65 years old.
* Body mass index (BMI) \> 18.5 kg/m2 and \< 30.0 kg/m2; minimum body weight of 50 kg.
* Good health and no clinically significant findings on:
* Physical examination
* 12-lead ECG
* Clinical laboratory tests (serum chemistry, haematology, coagulation, urine drug screen, and urinalysis (UA))
* Seated systolic blood pressure (BP) 90 to 140 mm Hg.
* Seated diastolic BP 60 to 90 mm Hg.

Psoriasis Patients (Expansion Cohort):

Main Inclusion Criteria:

* Clinical diagnosis of chronic plaque psoriasis with a disease duration of at least 6 months; patients with concurrent psoriatic arthritis may be enrolled.
* Psoriasis Area and Severity Index (PASI) score ≥ 12 at baseline.
* Psoriasis plaque BSA (Body surface area) ≥ 10%
* PGA (Physician Global Assessment) ≥ 3.
* Age 18 to 65 years old.
* Body mass index \> 18.5 and \< 35.0 kg/m2; minimum body weight of 50 kg.

Ulcerative Colitis Patients (Expansion Cohort):

Main Inclusion Criteria:

* Moderately to severely active ulcerative colitis as defined by:
* Baseline Mayo Score of 6 to 12; and
* Endoscopic sub-score ≥2 as read by central reader
* Is intolerant, refractory, or only partially responsive to corticosteroids (not including budesonide), immunomodulators (azathioprine \[AZA\] or 6-mercaptopurine \[6-MP\], and methotrexate), or biologics.
* Age 18 to 65 years old.
* Body mass index \> 18.5 and \< 35.0 kg/m2; minimum body weight of 50 kg.

Exclusion Criteria:

Main Exclusion Criteria

* Clinically significant manifestation of metabolic; hepatic; renal; haematological; pulmonary; cardiovascular; gastrointestinal; musculoskeletal; dermatological; urogenital; eye, ear, nose, and throat; psychiatric; or neurological disorders.
* Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \> 1.2 times the upper limit of normal (ULN) as defined by the laboratory.
* Positive hepatitis panel (hepatitis B surface antigen \[HBsAg\] and anti-hepatitis C virus \[HCV\]) or positive human immunodeficiency virus (HIV) antibody.
* Positive Quantiferon tuberculosis (TB) test at Screening Visit.
* Receipt of live vaccine less than 1 month prior to Check in or plan to receive live vaccine during the study or up to 3 months following End of Treatment visit.
* Infection in the 4 weeks prior to Check-in that required hospitalization or parenteral antibiotics.

Psoriasis Patients (Expansion Cohort):

Main Exclusion Criteria:

* History of malignancy, diagnosed or known to be active or actively treated within the past 5 years, other than resected lesions of low malignant potential, such as basal cell skin cancers or low risk squamous cell carcinomas of the skin.
* Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \> 2 times the upper limit of normal (ULN) as defined by the laboratory.
* Creatinine \> 1.5 times ULN as defined by the laboratory.
* Positive hepatitis panel (hepatitis B surface antigen \[HBsAg\] and anti-hepatitis C virus \[HCV\]) or positive human immunodeficiency virus (HIV) antibody.
* Positive Quantiferon tuberculosis (TB) test at Screening Visit.
* Receipt of live vaccine less than 1 month prior to Check in or plan to receive live vaccine during the study or up to 3 months following End of Treatment visit.
* Infection in the 4 weeks prior to Check-in that required hospitalization or parenteral antibiotics.
* Use of a prescription medication that could have an effect on psoriasis (eg, lithium, systemic steroids, immunosuppressants) during the 14 days before Check-in; use of prescription medications for psoriasis is not permitted until after the Follow-up Visit.
* Non plaque forms of psoriasis (eg, erythrodermic, guttate, or pustular).
* Use of biologic agents (eg, adalimumab, etanercept, infliximab, ustekinumab, ixekizumab, secukinumab, guselkumab, tildrakizumab, brodalumab) or psoralen and ultraviolet A (PUVA) within 12 weeks prior to Check-in, ultraviolet B (UVB) phototherapy, use of tanning beds, or use of systemic medications such as methotrexate, cyclosporine A, acitretin, tofacitinib or apremilast within 4 weeks prior to Check-in, or topical anti-psoriasis medications (except emollients) within 2 weeks prior to Check-in.

Ulcerative Colitis Patients (Expansion Cohort):

Main Exclusion Criteria:

* Ulcerative colitis requiring immediate surgical, endoscopic, or radiological intervention including massive haemorrhage, perforation and sepsis, suppurative complications, or toxic colon.
* Stool positive for Clostridium difficile toxin, enteric pathogens, or ova and parasites.
* Positive hepatitis panel (hepatitis B surface antigen \[HBsAg\] and anti hepatitis C virus \[HCV\]) or positive human immunodeficiency virus (HIV) antibody.
* Positive Quantiferon tuberculosis (TB) test at Screening Visit.
* Receipt of live vaccine less than 1 month prior to Check in or plan to receive live vaccine during the study or up to 3 months following End of Treatment visit.
* Infection in the 4 weeks prior to Check-in that required hospitalization or parenteral antibiotics.
* Use of biologic agents (eg, adalimumab, etanercept, infliximab, ustekinumab, ixekizumab, secukinumab, guselkumab, tildrakizumab, brodalumab) or psoralen and ultraviolet A (PUVA) within 12 weeks prior to Check-in, ultraviolet B (UVB) phototherapy, use of tanning beds, or use of systemic medications such as methotrexate, cyclosporine A, acitretin, tofacitinib or apremilast within 4 weeks prior to Check-in, or topical anti-psoriasis medications (except emollients) within 2 weeks prior to Check-in.