Targeting lung cancer genes improves outcome: study

Lung cancer patients who received a drug designed to target a genetic dysfunction lived longer with fewer side effects than those who received traditional chemotherapy, a study showed Saturday.

Researchers found that patients with an abnormal ALK gene who received Pfizer's targeted drug crizotinib remained cancer-free for nearly five months longer.

"This study demonstrates the value of testing lung cancer tissue for an ALK rearrangement, and it underscores the potential of cancer genomics to target cancer treatments to each patient," said senior author Pasi Janne of Harvard's Dana-Farber Cancer Institute in Massachusetts.

"ALK now becomes the second abnormal gene that we are able to successfully target in lung cancer with drugs other than chemotherapy."

Just five percent of the patients with the most common form of lung cancer have an abnormal ALK gene, but crizotinib could nonetheless help 5,000 patients a year in the United States.

The phase III trial of 347 patients with advanced non-small cell lung cancer found that those who received the drug went a median time of 7.7 months before their disease began to worsen, compared with three months for those who received traditional chemotherapy.

The response rate of 65 percent was also more than triple that of chemotherapy. Survival rates were similar because chemotherapy patients whose tumors progressed were switched over to crizotinib.

The side effects -- visual disorders, gastrointestinal problems, elevated liver enzymes, and leg swelling -- were generally mild and not as severe as the fatigue and hair loss associated with chemotherapy.

While this study examined the impact of crizotinib on patients who had already received one round of chemotherapy, another phase III study is currently underway to see how it performs as the first treatment for newly diagnosed patients.

A second study reported the first case of resistance to crizotinib among patients with a different and recently-identified genetic mutation, ROS1.

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Targeting lung cancer genes improves outcome: study