222 CML patients from the ongoing German TIGER study (CML-V; NCT01657604) were investigated...patients carrying an ASXL1 mutation at diagnosis showed a less favorable molecular response to nilotinib treatment, as a major molecular response (MMR) was achieved less frequently at month 12 (55% vs. 85%; p=0.0036), month 18 (60% vs. 89%; p=0.0018), and month 24 (65% vs. 89%; p=0.0076) compared to patients without mutations.