** Shares of Arvinas Inc ARVN.O fall 14.1% to $45.10, its
biggest one-day pct slump in more than 3 months
** Sanofi SASY.PA stopped further work on its experimental
breast cancer drug amcenestrant, which belongs to a class of
drugs known as selective oestrogen receptor degraders (SERD)
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** ARVN is developing a similar drug, ARV-471, for some
breast cancer patients
** Shares of Olema Pharma OLMA.O , which is also developing
a SERD treatment, down 5.6% at $4.03
** Jefferies says Sanofi's SERD discontinuation supports
mixed view of the drug class
** Including session fall, ARVN shares are down ~45% YTD
(Reporting by Manas Mishra)
((Manas.Mishra@thomsonreuters.com;
www.twitter.com/Manaswrites15;))