** Shares of drug developer Compass Therapeutics CMPX.O fall 14.5% to $1.62
** CMPX says its experimental biliary tract cancer drug, tovecimig, when combined with chemotherapy, showed an overall response rate $(ORR.AU)$ of 17.1% in patients compared to 5.3% who received chemotherapy alone
** ORR is the proportion of patients whose tumors reduced in size or disappeared over a predefined period of time
** Brokerage Leerink Partners says this response rate is lower than expected, and lower than what was seen in previous trials
** Other treatments, such as Enhertu by AstraZeneca AZN.L and Pemazyre by Incyte INCY.O, have shown higher response rates in similar patient populations, brokerage says
** Including sessions moves, CMPX stock up 31% YTD
(Reporting by Padmanabhan Ananthan)
((padmanabhan.ananthan@thomsonreuters.com))
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