A year ago, bile duct cancer seen in Vietnam veterans was a hot topic in the news, briefly. Now it’s fallen out of the headlines — but it hasn’t stopped affecting veterans, and a U.S. senator is calling for a federal study.

Bile duct cancer in veterans who served in Vietnam (or Korea, Thailand or Laos) no doubt comes from eating fish contaminated with a water-borne parasitic worm called a fluke, from

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