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Gene Test Predicts Return of Colon Cancer

Test Called Oncotype DX Could Help Patients Decide if Chemotherapy Is Needed

The Chemotherapy Dilemma continued...

In patients with low recurrence scores, "I don't think any doctor would recommend chemotherapy. The side effects and hassle of chemotherapy outweigh the benefits," he says.

But in patients with high recurrence scores, chemo can cut the risk of cancer coming back by another 5%, Kerr tells WebMD. "We know from other work that patients are willing to accept side effects given that degree of benefit."

What about patients at intermediate risk? There, the answer is less clear, Kerr says. "In my clinical practice, I find that younger medium-risk patients tend to say the benefits of chemo outweigh the risks. Those age 70 and older say, 'Thanks, but no thanks.'"

Schilsky tells WebMD that the new test is a good step forward. But he says he would like to see it better discriminate between patients at low and high risk of recurrence.

Kerr says studies to refine the test, incorporating more genes that may be involved in colon cancer and following larger numbers of patients, are under way.

His team also hopes to develop a score to predict not only whether a patient will suffer a recurrence, but also whether chemotherapy will actually work. Their first attempt at such a test failed, largely due to too few patients, Kerr says.

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