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FDA approval of acalabrutinib for adult patients with CLL or SLL
On the 21st November 2019, the U.S. Food and Drug Administration (FDA) approved acalabrutinib for the treatment of adult patients with chronic lymphocytic leukaemia (CLL) or small lymphocytic lymphoma (SLL).1 This is the second approval to be granted by Project Orbis, an initiative of the US FDA Oncology Center of Excellence, which provides a framework for concurrent submission and review of oncology medicines among international partners.2,3
Acalabrutinib, a second-generation selective inhibitor of Bruton’s tyrosine kinase (BTK), is also approved for the treatment of adult patients with mantle cell lymphoma (MCL) who have received at least one prior therapy.4 The supplemental approval of the new indications is based on the results of two phase III randomized clinical trials: ELEVATE-TN (NCT02475681) and ASCEND (NCT02970318).
The ELEVATE-TN trial included 535 patients with previously untreated CLL who were randomized (1:1:1) into three treatment arms: acalabrutinib monotherapy, acalabrutinib plus obinutuzumab, and chlorambucil plus obinutuzumab. With a median follow-up of 28.3 months, profession-free survival (PFS; IRC-assessed) was significantly improved in both acalabrutinib arms compared with chlorambucil chemotherapy plus obinutuzumab.1 The interim analysis results will be presented at the upcoming American Society of Hematology congress.5
In the ASCEND trial, 310 patients with relapsed/refractory CLL were randomized (1:1) into two treatment groups: acalabrutinib monotherapy or rituximab with investigator’s choice of idelalisib or bendamustine. Results showed a statistically significant and clinically meaningful improvement in PFS (IRC-assessed) with acalabrutinib monotherapy compared with the second treatment group.6
Across both studies, the safety and tolerability of acalabrutinib were consistent with the known profile. The most common adverse effects observed were anemia, neutropenia, upper respiratory tract infection, thrombocytopenia, headache, diarrhea, and musculoskeletal pain.2
The acalabrutinib clinical development program is ongoing in various hematologic malignancies including CLL, MCL, diffuse large B-cell lymphoma, and Waldenström macroglobulinaemia.7
References
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