An Open Label Phase Ia/b Dose Escalation Followed by Dose Expansion Safety and Tolerability Trial of CAP-100, a Humanized C-C-chemokine Receptor 7 Antibody, Administered as Monotherapy in Subjects With r/r Chronic Lymphocytic Leukemia
Introduction of immuno-chemotherapy in the treatment options of CLL and SLL changed the treatment paradigm of these diseases. Presently, first-line therapies for CLL/SLL include targeted therapies (e.g. ibrutinib, acalabrutinib) or combined immuno-chemotherapy regimens (e.g., fludarabine, cyclophosphamide, and rituximab for patients aged \<65 years without del17p/TP53 mutations or bendamustine and rituximab for patients ≥65 years who have additional comorbidities). Despite the gradual introduction of targeted therapies, new treatment strategies efficacious for patients ineligible for/unresponsive to these therapies are still required. These new strategies should ideally overcome disease relapse and circumvent compound-specific safety challenges. Emerging treatment options include new compounds aimed for both untreated and relapsed/refractory CLL, and combination therapies of existing compounds that extend single-agent efficacy in specific high-risk patient populations. CAP-100 is expected to prevent the migration of leukemia cells to and their survival in lymphoid niches as well as to eliminate CCR7-positive leukemia cells via ADCC, resulting in measurable clinical responses. The present trial is the first-in-human trial of CAP-100 and is divided into two phases. The aim of the Phase Ia (dose escalation) is to define the Recommended Phase 2 Dose (RP2D) versus the Maximum Tolerated Dose (MTD) of CAP-100 in subjects with CLL. Phase Ib of the trial (expansion phase) will evaluate the safety and preliminary clinical benefit of CAP-100 monotherapy at RP2D (response rate, lymph node size reduction, assessment of minimal residual disease \[MRD\]) to support the design of future trials investigating CAP-100 either as monotherapy or in a combination setting with approved treatments for CLL.
• Age ≥ 18 years.
• Able to understand and sign a written informed consent document.
• Eastern Cooperative Oncology Group (ECOG) performance status 0, 1 or 2.
• Relapsed or refractory to at least two (2) prior standard systemic treatment regimen for CLL or SLL (USA).
• Relapsed or refractory to at least two (2) prior standard systemic treatment regimen for CLL or SLL and without available therapies known to provide clinical benefit (until new amendment implemented, Spain).
• Prior CLL or SLL systemic therapy must have been discontinued for a duration of at least five times its half-life (palliative low dose steroids are allowed to bridge the time to CAP-100; major surgery or irradiation for CLL must have been completed \> 4 weeks prior to the first trial dose of medication). Prior chimeric antigen receptor (CAR)-T cell therapy is allowed.
• Life expectancy \> 16 weeks.
• Subjects must have met the diagnostic criteria for CLL according to the iwCLL 2018 guidelines (Hallek et al, 2018) or for SLL (NCCN guidelines, 2020) at some point during their disease course.
• Subjects must meet iwCLL 2018 guideline criteria (Hallek et al, 2018) for active disease.
• Platelet count ≥ 50,000/ μL, unless decrease is attributable to bone marrow infiltration of CLL.
⁃ Adequate liver function as indicated by aspartate transaminase (AST)/ alanine transaminase (ALT) ≤ 2.5 times upper limit of normal (ULN), unless directly attributable to the subject's tumor (in this case, acceptable levels are ≤ 5 x ULN).
⁃ Renal function as defined by creatinine clearance (CrCl)≥ 45 mL/min/1.73m2 (by CKD-EPI formula).
⁃ Women of childbearing potential and male subjects who have partners capable of reproduction must agree to use an effective contraceptive method during the course of the trial and for 4 months following the completion of their last treatment. Women of childbearing potential must have a negative serum β-subunit of hCG gonadotropin (β-hCG) pregnancy test result within 7 days of first trial dose. Female subjects who are surgically sterilized or who are \> 45 years old and have not experienced menses for \> 2 years may have β-hCG pregnancy test waived.