Primary zebrafish RMS tumor cells expressing a transgenic (rag2:dsRed) fluorescent reporter derived from three tumors were transplanted into a pool of syngeneic CG1-strain host zebrafish, and engrafted tumor fish were treated with DMSO (vehicle control), MYCi361 (100 mg/kg), vincristine (0.4 mg/kg) or MYCi361 and vincristine in combination with half the dosage for each drug for 7 days. This evidence concerns the gene RAG2 and neoplasm.