** Shares of Revolution Medicines RVMD.O up 16% at $125 in after-market trading
** Merck's MRK.N shares marginally down 0.6% at $110.30
** Peer cancer therapy developer Erasca ERAS.O up 10.2% at $6.40
** Merck is in talks to buy cancer drug developer Revolution Medicines, the Financial Times reported on Thursday, citing people familiar with the matter
** MRK and RVMD did not immediately respond to Reuters' requests for comment
** As of Thursday's close, MRK up 2.2%, RVMD up 4.6% and ERAS up 56.2% YTD
(Reporting by Megavarshini G. Somasundaram in Bengaluru)
((Megavarshini.SomasundaramGnanasundari@thomsonreuters.com))