In conclusion, we identified novel recurrently mutated genes in T-PLL, including PTPRC, regulating the JAK/STAT pathway, epigenetic regulators like PRDM2 and HERC1/2, and genes involved in DNA damage response and DNA repair like SAMHD1, which has most likely a tumor-suppressor function in T-PLL. The gene discussed is PRDM2; the disease is neoplasm.