Medicine CLL & CML 53953ea2 Which has worst prognosis in CLL? A 11q Deletion B 12q Trisomy C 17p Deletion D 13q Deletion High-Yield Explanation 13q deletion : Indolent course ; good prognosis Trisomy 12 : Intermediate prognosis 11q deletion : Poor prognosis 17p deletion : Poorest prognosis