** Shares of drugmaker Exelixis EXEL.O rise 23.8% to $49.97 premarket
** EXEL on Sunday said its experimental oral therapy zanzalintinib, combined with Roche's ROG.S Tecentriq, improved survival in patients with a type of colorectal cancer in a late-stage study
** Colorectal cancer develops in the colon’s inner lining and is the third most common cancer, according to CDC
** Males are more likely to develop this type of cancer than females
** As of last close, EXEL stock up 21.23% YTD
(Reporting by Padmanabhan Ananthan)
((Padmanabhan.Ananthan@thomsonreuters.com))