** Shares in biotech co Aptevo Therapeutics APVO.O drop
27.6% to $12.33 premarket
** APVO trending at No. 4 on retail investor-focused social
media platform Stocktwits.com, with message volume up 4,125%
** Co reported its best day on Tuesday after preliminary
data showed one high-risk cancer patient treated with its drug
and chemotherapy achieved complete remission after one cycle of
treatment urn:newsml:reuters.com:*:nL4N2SE2MA
** APVO was the sixth most traded stock on Fidelity's
trading app on Tuesday, indicating retail investors' interest
** Both brokerages covering APVO rate the stock "buy"
** Stock down 53.5% this year, as of last close
(Reporting by Bansari Mayur Kamdar)
((BansariMayur.Kamdar@thomsonreuters.com;))