LA JOLLA, California, Sept. 10 -- The Salk Institute for Biological Studies issued the following news release:

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Why does the immune system sometimes help tumors grow?

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* Highlights

* Salk researchers identify what flips a molecular "switch" that causes anti-cancer interferon activity to transition into pro-cancer activity, a longstanding mystery in cancer biology

* Chronic interferon activates a mito . . .

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