Sen. Elizabeth Warren (D-MA) (Michael Brochstein/Sipa USA/Sipa via AP Images)

De­moc­rats pe­ti­tion US patent of­fice to probe Mer­ck­'s new Keytru­da re­quests

De­moc­rats in both the House of Rep­re­sen­ta­tives and the Sen­ate are ask­ing the US Patent and Trade­mark Of­fice (PTO) to take a clos­er look at …

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