Working out of a tribal-owned hospital in Anchorage, Alaska, liver specialist Brian McMahon has spent decades treating the long shadow of hepatitis B. Before a vaccine became available in the 1980s, he saw the virus claim young lives in western Alaskan communities with stunning speed.

This story was produced in partnership with KFF Health News .

One of his patients was 17 years old when he first examined her for stomach pain. McMahon discovered she had developed liver cancer caused by hepatitis B, just weeks before she was set to graduate from high school as valedictorian. She died before the ceremony.

McMahon thinks often of an 8-year-old boy who showed no signs of illness until he complained of pain from what turned out to be a rapidly growing tumor on his liver.

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