Pediatric Blood & Cancer: In vivo evaluation of the lysine-specific demethylase (KDM1A/LSD1) inhibitor SP-2577 (Seclidemstat) against pediatric sarcoma preclinical models: A report from the Pediatric Preclinical Testing Consortium (PPTC) (Kurmasheva, Houghton)

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Raushan T. KurmashevaStephen W. EricksonRuolan HanBeverly A. TeicherMalcolm A. SmithMichael RothRichard GorlickPeter J. Houghton


SP-2577(Seclidemstat), an inhibitor of lysine-specific demthylase KDM1A (LSD1) that is overexpressed in pediatric sarcomas, was evaluated against pediatric sarcoma xenografts. SP-2577 (100 mg/kg/day × 28 days) statistically significantly (p < .05) inhibited the growth of three of eight Ewing sarcoma (EwS), four of five rhabdomyosarcoma (RMS), and four of six osteosarcoma (OS) xenografts. The increase in EFS T/C was modest (<1.5) for all models except RMS Rh10 (EFS T/C = 2.8). There were no tumor regressions or consistent changes in dimethyl histone H3(K4), HOXM1, DAX1, c-MYC, and N-MYC, or tumor histology/differentiation. SP-2577 has limited activity against these pediatric sarcoma models at the dose and schedule evaluated.

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Article Categories: Research Paper