On December 24, 2014, Genentech reported that the U.S. Food and Drug Administration (FDA) approved a supplemental biologics license application (sBLA) for Gazyva in combination with chlorambucil chemotherapy in people with previously untreated chronic lymphocytic leukemia (CLL) (Press release Genentech, DEC 24, 2014, View Source [SID:1234501261]). The sBLA adds to the label data from Stage 2 of the CLL11 study showing significant improvements with Gazyva plus chlorambucil across multiple clinical endpoints when compared head-to-head with Rituxan (rituximab) plus chlorambucil.

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The approval includes complete response (CR) and minimal residual disease (MRD) data from Stage 2 of the study. Additionally, overall survival (OS) data was added from Stage 1 of the study comparing Gazyva plus chlorambucil to chlorambucil alone.

"Gazyva is the first and only medicine to significantly help people live without their disease worsening when combined with chlorambucil compared to Rituxan and chlorambucil in people with previously untreated chronic lymphocytic leukemia," said Sandra Horning, M.D., chief medical officer and head of Global Product Development. "These new data enhance our understanding of the disease and its treatment, and this approval affirms an important treatment option for people with this difficult-to-treat disease."

The sBLA approval updated the Gazyva prescribing information with the following data:

Gazyva plus chlorambucil helped people with previously untreated CLL live nearly a year longer without their disease worsening or death (progression-free survival; PFS) than Rituxan plus chlorambucil (median PFS: 26.7 months vs. 14.9 months, respectively. HR=0.42, 95 percent CI 0.33-0.54, p<0.0001).
Gazyva plus chlorambucil nearly tripled the number of people showing no evidence of disease (CR) compared to Rituxan plus chlorambucil (26.1 percent vs. 8.8 percent, respectively).
Of the people who achieved a complete response with or without complete recovery from abnormal blood cell counts (CR, CRi), 19 percent (18/94) of people in the Gazyva arm compared to 6 percent (2/34) of people in the Rituxan arm were MRD negative in the bone marrow, and 41 percent (39/94) of people in the Gazyva arm compared to 12 percent (4/34) people in the Rituxan arm were MRD negative in the peripheral blood. MRD negative means no residual traces of the cancer were found.
Data from the first stage of the CLL11 study showed that at nearly two years, the rate of death was 9 percent (22/238) for people who received Gazyva plus chlorambucil compared to 20 percent (24/118) for those who received chlorambucil alone (HR=0.41, 95 percent CI 0.23-0.74). The median OS has not yet been reached.

Gazyva can cause serious or life-threatening side effects including: Hepatitis B reactivation, progressive multifocal leukoencephalopathy (PML), infusion reactions, tumor lysis syndrome, infections, and low white blood cell counts. The most common side effects of Gazyva are infusion reactions, low white blood cell counts, low platelet counts, low red blood cell counts, fever, cough, nausea, and diarrhea.

Gazyva, the first medicine approved with the FDA’s Breakthrough Therapy Designation, was approved for use in combination with chlorambucil in people with previously untreated CLL on November 1, 2013. Gazyva, known as Gazyvaro in Europe, was approved by the European Commission for the same indication in July 2014. Gazyva is also being investigated in a broad development program across various types of blood cancers, including multiple Phase III studies in non-Hodgkin’s lymphoma (NHL).

About the CLL11 Study

CLL11 is a Phase III, multicenter, open-label, randomized three-arm study, conducted in cooperation with the German CLL Study Group, in 781 previously untreated people with CLL and co-existing medical conditions. Stage 1 (n=589) compared Gazyva plus chlorambucil to chlorambucil alone and Rituxan plus chlorambucil to chlorambucil alone. Stage 2 (n=663) compared Gazyva plus chlorambucil directly with Rituxan plus chlorambucil. The primary endpoint of the study was PFS with secondary endpoints including overall response rate (ORR), OS, CR, median duration of response, MRD and safety profile. Results from Stage 2 and updated data from Stage 1 were presented in 2013 during the Plenary Scientific Session of the American Society of Hematology (ASH) (Free ASH Whitepaper) meeting and published in the New England Journal of Medicine in 2014.