Genentech announced 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).
Gazyva was the first medicine approved with the FDA’s Breakthrough Therapy Designation, and was approved for use in combination with chlorambucil in people with previously untreated CLL in late, 2013.
CLL is characterized by the production of atypical lymphocytes. Lymphocytes are specialized immune cells that exist in two forms: B- and T-cells. These cells are produced in the bone marrow and each serves a specific function in aiding the body to fight infection. The large majority of CLL cases involve mature B-lymphocytes that tend to live much longer than normal. B-lymphocytes accumulate in the blood, bone marrow, lymph nodes, and spleen. This results in overcrowding of these areas and suppression of the formation and function of blood and immune cells. Additionally, the cancerous lymphocytes themselves do not function normally, leading to a further reduction in the body’s ability to fight infection. The disease tends to get worse slowly.
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.
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