The ORR was 62%,with six pts reaching complete response (CR),four pts reaching marrow CR and three pts achieved marrow CR+ hematologic improvement (HI)...In these 21 pts, the most frequently mutated genes are ASXL1 (28.6%), RUNX1 (14.3%) and TET2 (14.3%)...This is the first study to evaluate the efficacy and safety of sintilimab plus decitabine in pts with untreated higher-risk MDS. The preliminary results demonstrate that the combination therapy is relatively safe with anti-tumor activity.