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Background Drug–drug interactions between antiretroviral treatment (ART) and cytostatics may have a negative impact in the prognosis of people with HIV (PWH) and cancer. Objective The objective of this study is to evaluate the impact of the implementation of interdisciplinary management and the type of ART in PWH diagnosed with lymphoid neoplasms. Methods This is a multicentric, retrospective observational cohort study including PWH diagnosed with lymphoid neoplasm who started first-line chemotherapy between 2008 and 2020. Demographic, clinical and therapeutic variables were obtained from the electronic medical records and associated with 5-year progression-free survival (PFS) and overall survival (OS) using Cox proportional hazard models. Results A total of 118 individuals were included. Boosted ART was being used in 55 (46.6%) cases at the time of neoplasm diagnosis. The Infectious Diseases or the Pharmacy Department was consulted before starting chemotherapy in 79/118 (66.9%) cases. Interdisciplinary management resulted in fewer subjects taking boosted ART (17.7% versus 71.8%, P  < 0.001) and more subjects using unboosted integrase strand transfer inhibitor–based ART (74.7% versus 7.7%, P  < 0.001). The use of boosted ART with chemotherapy was associated with worse 5-year PFS (P  = 0.003) and 5-year OS (P  = 0.016). There was a trend towards better 5-year PFS and OS when interdisciplinary management was implemented, with significant differences for individuals receiving boosted ART at neoplasm diagnosis (P  = 0.0246 and P  = 0.0329, respectively). Conclusions Our findings underscore the significant impact of the type of ART on the prognosis of PWH undergoing chemotherapy. Encouraging collaborative management between oncologists, pharmacists and HIV teams for these patients enhances PFS and OS rates. [ABSTRACT FROM AUTHOR]