Calithera Biosciences Announces First Patient Enrolled in Phase 2 Clinical Trial of Mivavotinib in Relapsed/Refractory non-GCB (ABC) Diffuse Large B-Cell Lymphoma

— Novel biomarker will be used to identify patients in genetically defined subgroup associated with poorer outcomes

— Study will evaluate SYK inhibitor both in patients with wild-type disease and those with tumors that harbor MYD88 or CD79b mutations

Excerpt from the Press Release:

SOUTH SAN FRANCISCO, Calif., June 23, 2022 (GLOBE NEWSWIRE) — Calithera Biosciences, Inc. (Nasdaq: CALA), a clinical-stage, precision-oncology biopharmaceutical company, announced that the first patient has been enrolled in a multicenter phase 2 clinical trial evaluating its spleen tyrosine kinase (SYK) inhibitor mivavotinib (CB-659) in patients with relapsed/refractory non-germinal center B-cell like (non-GCB) diffuse large B-cell lymphoma (DLBCL), a DLBCL subpopulation that primarily comprises patients with activated B-cell like disease (ABC).

In a retrospective analysis of prior phase 1/2 studies in patients with DLBCL, patients with non-GCB DLBCL who received mivavotinib had a response rate of 53%, as compared to a response rate of 22% in patients with GCB DLBCL. Additionally, recent preclinical studies have shown enhanced SYK activity, and greater sensitivity to SYK inhibition, in DLBCL tumor-cell lines with mutations in MYD88 and CD79b genes. A significant fraction of patients with non-GCB DLBCL have tumors that harbor these mutations, and this subset of patients is known to have poorer outcomes with standard-of-care therapies.

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