U.S. OKs New Colon-Cancer Drug
The Food and Drug Administration approves a new drug for colon cancer -- the second-biggest cancer killer. Called Avastin, the new drug blocks tumors' blood supply. Earlier in February, the FDA approved Erbitux, which shrinks colon tumors by blocking a protein they need to grow. Each drug is the first of its kind. NPR's Richard Knox reports.

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