Genzyme Corporation (Nasdaq: GENZ) announced today that it has filed a supplemental New Drug Application with the U.S. Food and Drug Administration for the use of Clolar® (clofarabine) to treat adult patients with acute myeloid leukemia (AML). The company has requested priority review of its application and, if granted, Clolar could be approved for this indication in the first half of 2009.
Clolar is currently approved in the United States and Europe for the treatment of acute lymphoblastic leukemia (ALL) in relapsed and refractory pediatric patients one to 21 years old who have received at least two prior treatments, and it is now a standard of care in this setting. Genzyme is developing clofarabine globally for the treatment of adult AML, earlier-line pediatric ALL, and myelodysplastic syndromes (MDS), broader indications that the company estimates could drive peak annual sales of the product to approximately $600 million.
“Clolar has an important role in the treatment of pediatric leukemia and has great potential to help a broader set of patients with hematological disorders,” said Beth Trehu, M.D., vice president and general manager for Clofarabine. “We are committed to fulfilling the potential of this product by expanding its indications and securing approvals globally.”
Supplemental NDA filing
AML is a cancer characterized by the rapid proliferation of abnormal white blood cells that accumulate in the bone marrow and interfere with the production of normal blood cells. The condition is the most common acute leukemia affecting adults.
Genzyme’s supplemental NDA seeks approval for Clolar’s use as a single agent in previously untreated adults aged 60 years or older with AML who have at least one unfavorable prognostic factor. Many older AML patients with unfavorable prognostic indicators currently have poor outcomes using available induction chemotherapy. Clolar, if approved, would fulfill an unmet need for this difficult to treat patient population. Approximately 30 percent of older adult patients with AML receive any form of chemotherapy.
According to the American Cancer Society, in 2008 approximately 13,290 people will be diagnosed with acute myeloid leukemia (AML) in the United States, and most AML patients will be adults. The median age of a patient with AML is about 67 years.
The median survival for those patients receiving the current available induction chemotherapy-which is associated with high mortality-can vary from 1 to 13 months, and the 5-year survival rate over the past three decades remains at less than 10 to 15 percent. Older AML patients often have disease features such as an adverse cytogenetics profile or pre-existing blood disorders such as MDS that result in lower response rates and worse treatment outcomes compared to younger patients treated with conventional combination chemotherapy. In addition, current therapies are poorly tolerated in older patients with unfavorable risk factors, such as advanced age and poor performance status.
Genzyme will use the results of the CLASSIC II study to support its label expansion filing. This large Phase 2 clinical trial demonstrated that patients with at least one pre-specified unfavorable prognostic factor who received single agent Clolar achieved a 45 percent overall remission rate, including a 40 percent complete remission rate and a 5 percent complete remission rate with incomplete platelet recovery. These data were presented in June at the American Society of Clinical Oncology meeting. Updated data will be presented in December at the American Society of Hematology (ASH) meeting in San Francisco.
Importantly, the 30 day all-cause mortality, one of the study’s secondary endpoints, was 9.6 percent, which compares favorably to conventional induction chemotherapy, known as the “7 + 3″ regimen, where the 30 day induction mortality ranges from 10-30 percent up to 50-80 percent with increasing age and worsening performance status.
These patients had manageable treatment-related side effects. The most commonly occurring adverse reactions included nausea, febrile neutropenia, vomiting, diarrhea, rash, increased alanine aminotransferase, increased aspartate aminotransferase, fatigue, pneumonia, fever, headache, neutropenia, anorexia, mucosal inflammation, pruritus, and thrombocytopenia.
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