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Ohio State study: Targeted ovarian cancer therapy not cost-effective
Date:3/7/2011

COLUMBUS, Ohio An analysis conducted by Ohio State University cancer researchers has found that adding the targeted therapy bevacizumab to the treatment of patients with advanced ovarian cancer is not cost effective.

The findings comparing the relative value of various clinical strategies will be published online March 7 in the Journal of Clinical Oncology.

The researchers performed a cost-effectiveness analysis looking at a clinical trial conducted by the Gynecologic Oncology Group (GOG) studying the use of bevacizumab along with standard chemotherapy for patients with advanced ovarian cancer, said first author Dr. David E. Cohn, a gynecologic surgical oncologist and researcher at The Ohio State University Comprehensive Cancer Center Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC James).

Bevacizumab is a novel targeted therapy designed to inhibit angiogenesis, the process by which new blood vessels develop and carry vital nutrients to a tumor.

Although a discussion regarding cost-effectiveness of a potentially life-extending intervention invariably suggests the rationing of limited health care resources, the intent of this study was to provide a framework with which to evaluate the pending results of a clinical trial of three different interventions for ovarian cancer, said Cohn.

"We do not suggest that bevacizumab, also known by the brand name Avastin, should be withheld from a patient with ovarian cancer, but rather argue that studies evaluating the effectiveness of new treatments should also be interpreted with consideration of the expense," says Cohn, who collaborated with Dr. J. Michael Straughn Jr., an associate professor of obstetrics and gynecology at the University of Alabama at Birmingham.

The results of the randomized phase III GOG clinical trial demonstrated an additional 3.8 months of progression-free survival when maintenance bevacizumab was added for about one year following treatment with standard chemotherapy drugs carboplatin and paclitaxel along with bevacizumab.

"We put together a model looking at the variety of treatment arms on this clinical trial, each of which included 600 patients," said Cohn. "Given the fact that the addition of the drug was associated with 3.8 months of additional survival without cancer, we set out to determine whether or not that benefit of survival was justified by the expense of the drug."

The model showed that standard chemotherapy for patients in the clinical trial would cost $2.5 million, compared to $78.3 million for patients who were treated with standard chemotherapy and bevacizumab, plus additional maintenance treatments of bevacizumab for almost one year.

Bevacizumab has been used in the treatment of recurrent ovarian cancer, and the U.S. Food and Drug Administration has approved it for the treatment of colorectal, lung, breast, brain (glioblastoma) and renal cell cancers.

Typically each treatment with bevacizumab costs $5,000, with most of those costs directly attributable to the cost of the drug, Cohn said.

Effectiveness was defined as months of progression-free survival, and costs were calculated as total costs per strategy. Cost-effectiveness strategies were defined as the cost per year of progression-free survival. Incremental cost-effectiveness ratio was defined as the costs per progression-free life-year saved.

"Ultimately, we found that if you reduced the drug cost to 25 percent of the baseline, it does become cost effective to treat patients with bevacizumab," said Cohn. "Or, if the survival could be substantially increased above the 3.8 months of progression-free survival, that could lead to cost-effective treatment for patients with advanced ovarian cancer."

Ovarian cancer is the most lethal gynecologic cancer, with almost 14,000 women expected to die from the disease this year, according to the American Cancer Society.

"It is anticipated that in the future, there will be increased scrutiny regarding the individual and societal costs of an effective medication," said Cohn. "We hope that future clinical trials will incorporate the prospective collection of cost, toxicity and quality-of-life data to allow for a fully informed interpretation of the results."


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Contact: Eileen Scahill
Eileen.Scahill@osumc.edu
614-293-3737
Ohio State University Medical Center
Source:Eurekalert

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