To further investigate the effect of CTX-712 on tumor growth in vivo, we established 13 MDS/AML-derived xenografts (PDXs), which were treated with varying doses of CTX-712. Among the 13 PDX models, SRSF2 mutation was found in 2 cases, which had the SRSF2 P95H or P95L mutation...Overall, 10 out of 13 PDX AML/MDS models, including 2 SRSF2-mutated models, showed anti-tumor effect of CTX-712.