P1336: ANTIVIRAL EXPOSURE TO GANCICLOVIR AND VALGANCICLOVIR IS NOT ASSOCIATED WITH INCREASED INCIDENCE OF RELAPSE OR SECONDARY MALIGNANCIES IN HEMATOPOIETIC STEM CELL TRANSPLANTATION RECIPIENTS. (23rd June 2022) - Duarte, D.; Duarte, S.; Sol dos Reis, C.; Silva Coelho, P.; Leite, L.; Branca, R.; Roncon, S.; Pinho Vaz, C.; Campos, A.