Why cancer patients waste away

A tumor-produced protein prevents cells from consuming sugar, two fly studies find

Ovaries

SHRIVELED  Tumors implanted in adult female fruit flies cause healthy ovaries (one shown, left) to waste away. The wasting (right) is caused by a protein secreted by cancer cells. The bar shown represents 500 micrometers.

D. Bilder and A. Figueroa-Clarevega/Univ. of California, Berkeley

A protein released by tumors is what causes cancer patients to waste away, studies of fruit flies suggest.