FDA: Proposed Bristol-Myers Drug Appears To Slow Leukemia
2007-11-30 13:14:48FDA: Proposed Bristol-Myers Drug Appears To Slow Leukemia
June 1, 2006: 10:55 a.m. EST
By Jennifer Corbett Dooren Of DOW JONES NEWSWIRES ATLANTA -(Dow Jones)-
The U.S. Food and Drug Administration said Thursday a proposed drug
from Bristol-Myers Squibb Co. (BMY) appears to slow the progression of
certain types of leukemia in patients who failed other treatments
including Novartis AG's (NVS) Gleevec, based on preliminary clinical
studies.
The FDA posted its review of the drug, dasatinib, on its Web site
Thursday, a day before an outside panel of medical experts is set to
make recommendations about whether the agency should approve the drug.
The FDA's oncology advisory panel meeting will be held in Atlanta to
coincide with the American Society of Clinical Oncology's annual
meeting, which brings together top cancer researchers and experts.
Specifically, Bristol-Myers is seeking FDA approval for dasatinib to
treat patients with chronic myeloid leukemia, or CML, who have failed
treatment with other therapies such as Gleevec and the treatment of
adults with Philadelphia chromosome-positive acute lymphoblastic
leukemia and lymphoid blast chronic myeloid leukemia who have failed
other treatments.
Bristol-Myers submitted four Phase II studies looking at 551 patients
with different types of leukemia. All of the studies show dasatinib,
which the company has proposed selling under the brand name Sprycel,
either halted the progression of the disease or made it undetectable
in several patients. The drug showed a response rate in a range of 31%
to 74% of patients depending on which type of leukemia they had.
However, the patients haven't been followed long enough to determine
whether treatment with dasatinib improves overall survival.
The studies also showed that almost all patients suffered from an
adverse event, such as diarrhea, nausea and vomiting, that likely was
caused by the drug. About 66% of patients suffered more serious
problems including fluid retention, a worsening of underlying blood
problems such as anemia and, in some cases, cardiac problems.
One of the issues the panel will consider is whether a lower starting
dose of dasatinib should be recommended in order to lower the rate of
adverse events. The panel also will be asked whether the company has
submitted enough data "to recommend dasatinib for the imatinib
(Gleevec) intolerant population," the FDA said in a memo.
When considering cancer drugs, the FDA sometimes accepts earlier Phase
II studies rather than larger Phase III studies it typically requires
most companies to submit with drug-approval applications. The FDA can
grant so-called accelerated approval of a drug based on Phase II
studies. But to gain full approval, companies must eventually submit
Phase III data. In 2001, the FDA approved Gleevec for the treatment of
chronic myeloid leukemia based on preliminary Phase II data. Novartis
later gained full approval for Gleevec for CML and then received
approval to treat a rare type of gastrointestinal cancer.
Some patients have developed resistance to Gleevec and there's
currently no FDA-approved treatment for CML patients who are
Gleevec-resistant. So far, the studies of dasatinib suggest the drug
works in many of those patients.
Bristol-Myers said it is "likely treatment with dasatinib will result
in a survival benefit in patients," based on the the Phase II data
which showed the drug produced a so-called cytogenetic response in
many patients.
The FDA typically follows its panel's advice, but isn't required to.
The agency is expected to make a final decision on dasatinib by the
end of the month.
The agency granted dasatinib priority review status, which the agency
grants to drugs or products that it believes are an advance over
existing treatments. It cuts about four months off of the typical
10-month FDA drug-review period.
In recent trading, Bristol-Myers shares were up 29 cents, or 1.2%, at
$24.84 on volume of 1.5 million. Average daily volume is 7.3 million.
-By Jennifer Corbett Dooren, Dow Jones Newswires; 202-862-9294;
Jennifer.Corbett@...