The U.S. health system could get some relief from rising drug prices from an unlikely source: a venture capitalist starting a new company to try to make medicines less expensive.

Alexis Borisy, 47, is a fixture in Boston biotech, known for his striking felt fedoras. He co-founded Foundation Medicine and Blueprint Medicines, both of them based in Cambridge, Mass., and focused, in different ways, on using genetics to treat cancer — the kind of approach that has produced remarkable outcomes but also driven up the price of drugs. His next company, called EQRx and being launched Monday, seeks to bring them down. He will serve as both CEO and chairman.