What’s behind the rapid rise of cancer in the under-50s?

Ian Sample speaks to the Guardian’s health editor, Andrew Gregory,
about the worrying global rise in cancers in under-50s, and hears
from Yin Cao, an associate professor in surgery and medicine at
Washington University in St Louis, who is part of a team conducting
a huge study into why young people are developing bowel cancer at
record rates. Help support our independent journalism at
theguardian.com/sciencepod