X0305 4/A 2012-04-27 2012-04-30 0001097264 ALLOS THERAPEUTICS INC ALTH 0001489966 Morris Charles Q 11080 CIRCLEPOINT ROAD SUITE 200 WESTMINSTER CO 80020 1 Chief Medical Officer Common Stock 2012-04-27 4 S 0 7970 1.8101 D 655031 D These shares are being sold pursuant to a 10b5-1 plan for Charles Q. Morris in order to cover the withholding tax and other costs associated with such sale (i.e., wire fees, commission or interest) in connection with the vesting of restricted stock units on April 26, 2012. /s/ David C. Clark, Attorney-in-Fact for Charles Q. Morris 2012-05-22