FDA APPROVES EXPANDED USE OF IMBRUVICA TO TREAT CHRONIC LYMPHOCYTIC LEUKEMIA

FROM:  FOOD AND DRUG ADMINISTRATION 
FDA NEWS RELEASE
For Immediate Release: Feb. 12, 2014
FDA approves Imbruvica to treat chronic lymphocytic leukemia

The U.S. Food and Drug Administration today expanded the approved use of Imbruvica (ibrutinib) for chronic lymphocytic leukemia (CLL) patients who have received at least one previous therapy.

CLL is a rare blood and bone marrow disease that usually gets worse slowly over time, causing a gradual increase in white blood cells called B lymphocytes, or B cells. The National Cancer Institute estimates that 15,680 Americans were diagnosed and 4,580 died from the disease in 2013.

Imbruvica works by blocking the enzyme that allows cancer cells to grow and divide. In November 2013, the FDA granted Imbruvica accelerated approval to treat patients with mantle cell lymphoma, a rare and aggressive type of blood cancer, if those patients received at least one prior therapy.

“Today’s approval provides an important new treatment option for CLL patients whose cancer has progressed despite having undergone previous therapy,” said Richard Pazdur, M.D., director of the Office of Hematology and Oncology Products in the FDA’s Center for Drug Evaluation and Research. “The FDA completed its review of Imbruvica’s new indication under the agency’s accelerated approval process, which played a vital role in rapidly making this new therapy available to those who need it most.”

Under the agency’s accelerated approval process, the FDA may approve a drug based on a surrogate or intermediate endpoint that is reasonably likely to predict clinical benefit. Drugs receiving accelerated approval are usually subject to an agreement to conduct confirmatory trials verifying and describing clinical benefit. Imbruvica for CLL also received priority review and orphan-product designation because the drug demonstrated the potential to be a significant improvement in safety or effectiveness in the treatment of a serious condition and is intended to treat a rare disease, respectively.

The FDA’s accelerated approval of Imbruvica for CLL is based on a clinical study of 48 previously treated participants. On average, participants were diagnosed with CLL 6.7 years prior to the study and had received four previous therapies. All study participants received a 420 milligram orally administered dose of Imbruvica until the treatment reached unacceptable toxicity or the disease progressed. Results showed nearly 58 percent of participants had their cancer shrink after treatment (overall response rate). At the time of the study, the duration of response ranged from 5.6 to 24.2 months. An improvement in survival or disease-related symptoms has not been established.

The most common side effects observed in the clinical study include low levels of platelets in the blood (thrombocytopenia), diarrhea, bruising, a decrease in infection-fighting white blood cells (neutropenia), low red blood cells (anemia), upper respiratory tract infection, fatigue, pain in the muscles and bones (musculoskeletal pain), rash, fever (pyrexia), constipation, swelling of tissues (peripheral edema), joint pain (arthralgia), nausea, mouth sores (stomatitis), sinus infection (sinusitis) and dizziness.

Imbruvica is manufactured by Sunnyvale, Calif.-based Pharmacyclics.

FDA APPROVES DRUG TO TREAT AGGRESSIVE TYPE OF BLOOD CANCER

FROM:  U.S. FOOD AND DRUG ADMINISTRATION 
FDA approves Imbruvica for rare blood cancer
Second drug with breakthrough therapy designation to receive FDA approval

The U.S. Food and Drug Administration today approved Imbruvica (ibrutinib) to treat patients with mantle cell lymphoma (MCL), a rare and aggressive type of blood cancer.

MCL is a rare form of non-Hodgkin lymphoma and represents about 6 percent of all non-Hodgkin lymphoma cases in the United States. By the time MCL is diagnosed, it usually has already spread to the lymph nodes, bone marrow and other organs.

Imbruvica is intended for patients with MCL who have received at least one prior therapy. It works by inhibiting the enzyme needed by the cancer to multiply and spread. Imbruvica is the third drug approved to treat MCL. Velcade (2006) and Revlimid (2013) are also approved to treat the disease.

“Imbruvica’s approval demonstrates the FDA’s commitment to making treatments available to patients with rare diseases,” said Richard Pazdur, M.D., director of the Office of Hematology and Oncology Products in the FDA’s Center for Drug Evaluation and Research. “The agency worked cooperatively with the companies to expedite the drug’s development, review and approval, reflecting the promise of the Breakthrough Therapy Designation program.”

Imbruvica is the second drug with breakthrough therapy designation to receive FDA approval. The Food and Drug Administration Safety and Innovation Act, passed in July 2012, gave the FDA the ability to designate a drug a breakthrough therapy at the request of the sponsor if preliminary clinical evidence indicates the drug may offer a substantial improvement over available therapies for patients with serious or life-threatening diseases.

The FDA is approving Imbruvica under the agency's accelerated approval program, which allows the FDA to approve a drug to treat a serious disease based on clinical data showing that the drug has an effect on a surrogate endpoint that is reasonably likely to predict a clinical benefit to patients. This program provides earlier patient access to promising new drugs while the company conducts confirmatory clinical trials. The FDA also granted Imbruvica priority review and orphan-product designation because the drug demonstrated the potential to be a significant improvement in safety or effectiveness in the treatment of a serious condition and is intended to treat a rare disease, respectively.

Imbruvica’s accelerated approval for MCL is based on a study where 111 participants were given Imbruvica daily until their disease progressed or side effects became intolerable. Results showed nearly 66 percent of participants had their cancer shrink or disappear after treatment (overall response rate). An improvement in survival or disease-related symptoms has not been established.

The most common side effects reported in participants receiving Imbruvica are low levels of platelets in the blood (thrombocytopenia), diarrhea, a decrease in infection-fighting white blood cells (neutropenia), anemia, fatigue, musculoskeletal pain, swelling (edema), upper respiratory infection, nausea, bruising, shortness of breath (dyspnea), constipation, rash, abdominal pain, vomiting, and decreased appetite. Other clinically significant side effects include bleeding, infections, kidney problems and the development of other types of cancers.

Imbruvica is co-marketed by Sunnyvale, Calif.-based Pharmacyclics and Raritan, N.J.-based Janssen Biotech, Inc. Velcade (bortezomib) is marketed by Millennium Pharmaceuticals, based in Cambridge, Mass. Revlimid (lenalidomide) is marketed by Summit, N.J.-based Celgene.