P348: MRK-560 AND DEXAMETHASONE ARE SYNERGISTIC IN THE TREATMENT OF T-CELL ACUTE LYMPHOBLASTIC LEUKEMIA. (23rd June 2022) - Vandersmissen, C.; Prieto Fernàndez, C.; Gielen, O.; Jacobs, K.; Govaerts, I.; Maertens, J.; Segers, H.; Cools, J.