RECRUITING Phase 2 ClinicalTrials.gov

A Study of Vemurafenib and Obinutuzumab Compared to Cladribine and Rituximab in People With Hairy Cell Leukemia (HCL)

Sponsor: Memorial Sloan Kettering Cancer Center • ClinicalTrials.gov ID: NCT06561360

Registry updated: 2026-09-09

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Description

The researchers are doing this study to compare the safety of vemurafenib in combination with obinutuzumab to the standard of approach of cladribine in combination with rituximab. The researchers will look at which treatment causes fewer or milder side effects. Researchers think vemurafenib and obinutuzumab (non-chemotherapy drugs) may cause fewer side effects compared with the usual approach of chemotherapy drugs. They will also compare the two approaches to see which approach is more effective at eliminating cancer cells.

Interventions

Vemurafenib (Drug)
Vemurafenib orally twice daily (b.i.d.) continuously in cycles of 4 weeks (28 days) for a total of 4 cycles.
Obinutuzumab (Drug)
Obinutuzumab will be administered concomitantly with vemurafenib starting at cycle 2 of treatment in cycles of 4 weeks.
Cladribine (Drug)
Cladribine IV on days 1-5 concurrently with rituximab.
Rituximab (Drug)
Rituximab on days 1-5 concurrently with rituximab.

Eligibility criteria

Inclusion Criteria: * Patients must be ≥ 18 years of age * Histologically confirmed classical HCL by the enrolling institution * Presence of BRAF V600E mutation as confirmed by PCR, NGS or immunohistochemistry. If patient is known to have negative BRAF mutation, repeat testing is advisable as well as discussion with the main study principal investigator. * Has not received any prior therapy for the disease * Patients who meet the standard treatment initiation criteria, as defined by ANC ≤1.0, Hgb ≤ 10.0 or PLT ≤100K * ECOG performance status of 0 - 2 * Acceptable pre-study organ function during screening as defined as: * Total bilirubin ≤ 1.5 times the upper limit of normal (ULN), except in patients with known Gilbert's syndrome who may be enrolled if direct bilirubin ≤ 3 x ULN); * Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5x ULN; and * Serum creatinine ≤ 1.5x ULN * Electrocardiogram (ECG) without evidence of clinically significant ventricular arrhythmias or ischemia as determined by the investigator and a rate-corrected QT interval (QTc, Bazett's formula) of \< 480 msec * For women of childbearing potential, agreement to the use of two acceptable methods of contraception, including one barrier method, during the study and for 6 months after discontinuation of vemurafenib and cladribine, and 18 months after discontinuation of rituximab and obinutuzumab * For men with female partners of childbearing potential, agreement to use a latex condom and to advise their female partner to use an additional method of contraception during the study and for 6 months after discontinuation of vemurafenib * Negative serum pregnancy test within 7 days of commencement of treatment in women of childbearing potential Exclusion Criteria: * Have had previous treatment for HCL, including purine analogs, vemurafenib, rituximab, obinutuzumab, and other investigational agents. Previous treatment with transfusions and other supportive care such as G-CSF and erythropoietin are allowed. * Known hypersensitivity to any of the study drugs. * Patients with known long QT syndrome or uncorrectable electrolyte abnormalities * Clinically significant history of liver disease, including viral or other hepatitis, current alcohol abuse, or cirrhosis. * Presence of positive test results for hepatitis B virus (HBV), hepatitis B surface antigen (HBsAg) or hepatitis C (HCV) antibody ° Patients with occult or prior HBV infection (defined as positive total hepatitis B core antibody \[HBcAb\] and negative HBsAg) may be included if HBV DNA is undetectable. These patients must be willing to undergo monthly DNA testing and take HBV viral prophylaxis such as entecavir. * Known infection with HIV or human T-cell leukemia virus 1 (HTLV-1) * Active uncontrolled infection, e.g. persistent bacteremia, supplemental oxygen or pressor supports, etc. * Live vaccination within 28 days of randomization * Patients with concurrent active malignancies as defined by malignancies requiring any therapy other than expectant observation or hormonal therapy, with the exception of squamous and basal cell carcinoma of the skin, in situ cervical cancer, adequately treated stage I/II cancer from which the patient is current in complete remission, or any other cancer from which the patient has been disease free for five years * Malabsorption syndrome or other condition that precludes enteral route of administration * Patients with HCL variant (as defined by absence of expression of CD25) * Pregnant or lactating, or intending to become pregnant during the study

Conditions

Hairy Cell Leukemia

Locations

Dana Farber Cancer Institute — Boston, Massachusetts, United States
Mayo Clinic Cancer Center — Rochester, Minnesota, United States
Memorial Sloan Kettering at Basking Ridge (All Protocol Activities) — Basking Ridge, New Jersey, United States
Memorial Sloan Kettering Monmouth (Limited Protocol Activities) — Middletown, New Jersey, United States
Memorial Sloan Kettering Bergen (Limited Protocol Activities) — Montvale, New Jersey, United States
Memorial Sloan Kettering Cancer Commack - Suffolk (Limited Protocol Activities) — Commack, New York, United States
Memorial Sloan Kettering Westchester (All Protocol Activities) — Harrison, New York, United States
Memorial Sloan Kettering Cancer Center (All Protocol Activities) — New York, New York, United States
Memorial Sloan Kettering Nassau (Limited Protocol Activities) — Uniondale, New York, United States
Ohio State University — Columbus, Ohio, United States

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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

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