Clinical trial NCT04523428: REtreatment With VEnetoclax and Acalabrutinib After Venetoclax Limited Duration (REVEAL)
Official title: A Prospective, Multicenter, Phase-II Trial of Venetoclax Plus Acalabrutinib in Patients Who Have Relapsed After First Line Venetoclax + Anti-CD20 mAb Treatment for Chronic Lymphocytic Leukemia (CLL or SLL)
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE2
Conditions: CLL/SLL
Lead sponsor: Stichting Hemato-Oncologie voor Volwassenen Nederland
Sponsor class: OTHER
First posted: 2020-08-21
Enrollment: 60
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: Fixed-duration regimens containing combinations of venetoclax with CD20 targeting agents are expected to soon become standard practice in first-line patients with chronic lymfocytic leukemia (CLL). The advantage of a fixed duration venetoclax combination as part of first-line treatment is the potential to retreat with venetoclax in patients who develop relapsed disease after a treatment free period. However, efficacy of venetoclax retreatment following a fixed duration venetoclax combination is still hypothetical as clinical data are lacking. Thus, there is an urgent need for data proving efficacy of venetoclax combinations following venetoclax treatment cessation. Testing of a novel venetoclax-containing regimen for relapsed CLL without the repeat of anti-CD20 monoclonal antibody (mAb) is a rational approach.

Detailed description: First-line venetoclax and CD20 antibody containing regimens that are currently being tested are based on either a fixed duration schedule or on an MRD-based time-limited schedule. The assumption of these regimens is that, aside from the deep (often uMRD) and often longstanding remissions, relapsed disease can be retreated with a venetoclax-based regimen. This, however, has not been formally proven.

In this study, patients who received a first line regimen with either venetoclax and rituximab (GAIA/CLL13/HOVON 140 trial, \[NCT02950051\] ) or venetoclax and the second generation anti-CD20 antibody obinutuzumab (GAIA/CLL13/HOVON 140 trial, and the HOVON139 trial \[Netherlands Trial Registry ID number #NTR6043\]) and have relapsed with the need for a subsequent treatment are eligible to enter the study and to receive a combination of venetoclax with the highly selective BTK inhibitor acalabrutinib. Combination of venetoclax with acalabrutinib is expected to lead to uMRD, making discontinuation of therapy possible.

Eligibility criteria: Inclusion Criteria:

* Documented CLL or SLL requiring treatment according to IWCLL criteria (appendix A) after at least (clinical) partial response as best response after the following initial study treatment: venetoclax-rituximab in HOVON 140/GAIA or venetoclax-obinutuzumab in HOVON 139/GIVE or HOVON 140/GAIA;
* WHO/ECOG performance status 0-3 (appendix C), stage 3 only if attributable to CLL
* Age at least 18 years;
* Adequate BM function defined as:

  * Hemoglobin \>5 mmol/l or Hb \> 8 g/dL
  * Absolute neutrophil count (ANC) \>0.75 x 109/L (750/μL), unless directly attributable to CLL infiltration of the BM, proven by BM biopsy
  * Platelet count \>30 x 109/L (30,000/μL) without transfusion and irrespective whether it is attributable to CLL infiltration in the BM;
* Estimated Glomerular Filtration Rate (eGFR) (MDRD) or estimated creatinine clearance (CrCl ≥ 30ml/min (Cockcroft-Gault appendix E); Please note: in case eGFR or CrCl is \<50ml/min the patient needs to be considered high risk for TLS
* Adequate liver function as indicated:

  * Serum aspartate transaminase (ASAT) and alanine transaminase (ALAT) ≤ 3.0 x upper limit of normal (ULN);
  * Bilirubin ≤1.5 x ULN (unless bilirubin rise is due to Gilbert's syndrome or of nonhepatic origin);
* Prothrombin time (PT)/International normal ratio (INR) \<1.5 x ULN and activated partial thromboplastin time (aPTT) \<1.5 x ULN;
* Negative serological testing for hepatitis B virus (HBV) (Hepatitis B surface antigen (HBsAg) negative and hepatitis B core antibody (anti-HBc) negative) and hepatitis C virus (hepatitis C antibody). Subjects who are positive for anti-HBc or hepatitis C antibody may be included if they have a negative PCR within 6 weeks before enrollment. Those who are PCR positive will be excluded; Please note: For patients positive for anti-HBc HBV-DNA PCR has to be repeated every month until 12 months after last dose of study treatment.
* Patient is able and willing to adhere to the study visit schedule and other protocol requirements;
* Patient is capable of giving informed consent;
* Written informed consent.

Exclusion Criteria:

* Any prior therapy with BTK inhibitor;
* Prior treatment with venetoclax other than first line;
* Other therapy with exception of chemo-/immunotherapy which is allowed also after venetoclax first line relapse;
* Transformation of CLL (Richter's transformation);
* Patient with a history of confirmed progressive multifocal leukoencephalopathy (PML);
* Malignancies other than CLL currently requiring systemic therapy or not treated in curative intention or showing signs of progression after curative treatment;
* Known allergy to xanthine oxidase inhibitors and/or rasburicase;
* History of drug-specific hypersensitivity or anaphylaxis to any study drug (including active product or excipient components);
* Active bleeding or history of bleeding diathesis (e.g. hemophilia or von Willebrand disease);
* Active fungal, bacterial, and/or viral infection that requires systemic therapy; Please note: active controlled as well as chronic/recurrent infections are at risk of reactivation/infection during treatment;
* Concurrent severe and/or uncontrolled medical condition (e.g. uncontrolled: infection, auto-immune hemolysis, immune thrombocytopenia, diabetes, hypertension, hyperthyroidism or hypothyroidism etc.);
* Patient known to be HIV-positive;
* Patient requiring treatment with a strong cytochrome P450 (CYP) 3A inhibitor/inducer (see appendix J) or anticoagulant therapy with warfarin or phenoprocoumon or other vitamin K antagonists; Please note: Patients being treated with DOACs apixaban, edoxaban or rivaroxaban can be included, but must be properly informed about the potential risk of bleeding under treatment with acalabrutinib. (see appendix J)
* History of stroke or intracranial hemorrhage within 6 months prior to registration;
* Severe cardiovascular disease (arrhythmias requiring chronic treatment, congestive heart failure or symptomatic ischemic heart disease, myocardial infarction within 6 months) (CTCAE grade III-IV, see appendix D);
* Severe pulmonary dysfunction (CTCAE grade III-IV, see appendix D);
* Severe neurological or psychiatric disease (CTCAE grade III-IV, see appendix D);
* Patient who has difficulty with or are unable to swallow oral medication, or have significant gastrointestinal disease that would limit absorption of oral medication;
* Vaccination with live vaccines within 28 days prior to registration;
* Use of any other experimental drug or therapy within 28 days of registration;
* Major surgery within 28 days prior to registration;
* Steroid therapy within 10 days prior to registration, with the exception of inhaled steroids for asthma, topical steroids, steroids up to 20 mg or dose equivalents of prednisolone daily to control autoimmune phenomenon's, or replacement/stress corticosteroids;
* Pregnant women and nursing mothers;
* Fertile men or women of childbearing potential unless: (1) surgically sterile or ≥ 2 years after the onset of menopause; (2) willing to use a highly effective contraceptive method such as oral contraceptives, intrauterine device, sexual abstinence or combination of male condom with either cap, diaphragm, or sponge with spermicide (double barrier methods) during study treatment and for 30 days after end of treatment;
* Current participation in other clinical trial (other than follow up HOVON139/HOVON140);
* Any psychological, familial, sociological and geographical condition potentially hampering compliance with the study protocol and follow-up schedule.

Primary outcomes:
measure: uMRD in BM by flow cytometry after 26 cycles (2 acalabrutinib and 24 AV).
timeFrame: 26 months
Secondary outcomes:
Other outcomes:
Locations:
city: Brussels
country: Belgium
facility: BE-Bruxelles-STLUC
city: Leuven
country: Belgium
facility: BE-Leuven-UZLEUVEN
city: Aarhus
country: Denmark
facility: DK-Aarhus N-AUH
city: Amsterdam
country: Netherlands
facility: NL-Amsterdam-AMC
city: Arnhem
country: Netherlands
facility: NL-Arnhem-RIJNSTATE
city: Breda
country: Netherlands
facility: NL-Breda-AMPHIA
city: Delft
country: Netherlands
facility: NL-Delft-RDGG
city: Den Bosch
country: Netherlands
facility: NL-Den Bosch-JBZ
city: Dordrecht
country: Netherlands
facility: NL-Dordrecht-ASZ
city: Ede
country: Netherlands
facility: NL-Ede-ZGV
city: Eindhoven
country: Netherlands
facility: NL-Eindhoven-MAXIMAMC
city: Groningen
country: Netherlands
facility: NL-Groningen-UMCG
city: Leeuwarden
country: Netherlands
facility: NL-Leeuwarden-MCL
city: Maastricht
country: Netherlands
facility: NL-Maastricht-MUMC
city: Nieuwegein
country: Netherlands
facility: NL-Nieuwegein-ANTONIUS
city: Rotterdam
country: Netherlands
facility: NL-Rotterdam-IKAZIA
city: Rotterdam
country: Netherlands
facility: NL-Rotterdam-MAASSTADZIEKENHUIS
city: Utrecht
country: Netherlands
facility: NL-Utrecht-UMCUTRECHT
Study officials:
affiliation: AMC/HOVON
name: A. Kater
role: PRINCIPAL_INVESTIGATOR
References: