Cell viability screening showed a significant difference in drug response to the nucleoside analogues cytarabine (adjusted p-value = 1E-04) and fludarabine (adjusted p-value = 4E-03), showing higher cell viability after 48 h in SAMHD1 mutated compared to unmutated patient-derived MCL cells....In conclusion, we report that SAMHD1 is recurrently mutated in MCL and confers resistance to nucleoside analogue therapy in vitro.