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Cancer Health Center

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Targeted Drugs Slow Kidney Cancer

Drugs That Target a Tumor's Blood Supply May Help Treat Advanced Kidney Cancer
WebMD Health News
Reviewed by Louise Chang, MD

Jan. 10, 2007 -- Drugs that target blood vessels that feed tumors are showing promise in the treatment of advanced kidneycancer.

Two studies published in the latest issue of The New England Journal of Medicine represent a "major step forward" in kidney cancer treatment, a leading researcher in the field tells WebMD.

The studies offer some of the best evidence yet that therapies that target the tumor blood supply -- known as antiangiogenesis drugs -- have a role to play in cancer treatment, says James Brugarolas, MD, PhD, of the University of Texas Southwestern Medical Center in Dallas.

Researchers evaluated the oral drugs sunitinib and sorafenib. The drugs target the blood supply of the tumor and tumor growth.

"Just a few years ago, we only had one highly toxic drug approved for the treatment of this cancer," says Brugarolas, who did not participate in the two trials. "We now have these new treatments that arise from our understanding of the biology of this cancer."

The two new drugs did not cure patients of their disease, and it is not yet clear if they help keep patients alive longer than traditional drug therapies.

But both drugs appeared to slow tumor growth by several months in patients who participated in the two studies.

Particularly Deadly Cancer

An estimated 39,000 Americans are diagnosed with kidney cancer each year, and 13,000 people die of the disease, according to the American Cancer Society.

Surgery is the treatment of choice for localized disease, but in well over half of cases the tumor has either spread beyond the kidneys at diagnosis or the cancer recurs following surgery.

For many years, the toxic therapies interferon alfa or interleukin-2 have been the only available treatments for advanced renal kidney cancer, but they work for only a small percentage of patients.

As a result, the estimated five-year survival rate for patients with advanced kidney cancer is less than 10%, according to the National Cancer Institute.

These drugs help prevent tumor growth and target the tumor's blood supply. Both sunitinib and sorafenib have been approved by the FDA for the treatment of advanced kidney cancer.

The brand name of sunitinib is Sutent; it's made by Pfizer. The brand name of sorafenib is Nexavar; it's made by Bayer Healthcare. Both are WebMD sponsors.

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