[A retrospective cohort study on the incidence and influencing factors of malignancies among HIV-infected patients in Taizhou, Zhejiang Province].
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Objective: To analyze the incidence and risk factors of malignant tumors among HIV-infected patients in Taizhou, Zhejiang Province. Methods: The data were collected from the China Information System for Disease Control and Prevention and the Taizhou Chronic Disease Information Management System. A retrospective cohort study design was used. The subjects were HIV-infected patients who had their household registration in Taizhou from 2005 to 2023 and participated in the follow-up. The observation period was until December 31, 2024. The standardized incidence ratios (SIR) of malignant tumors among HIV-infected patients were analyzed. Cox proportional hazards regression model was used to analyze the influencing factors of malignant tumor incidence. Results: A total of 3 593 HIV-infected patients were included, of whom 292 had malignant tumors. The proportions of AIDS-defining malignancies and non-AIDS-defining malignancies were 12.33% (36/292) and 87.67% (256/292), respectively. The proportion of malignant tumors before and after AIDS confirmation was 43.49% (127/292) and 56.51% (165/292), respectively. 3 466 HIV-infected patients were included in the follow-up cohort, with a total follow-up of 24 968.59 person-years. The incidence rate of malignant tumors in patients with HIV infection was 658.46 per 100 000 (SIR=1.89, 95%CI: 1.61-2.20). The SIR of malignant tumors showed an upward trend with the increase of time. The results of Cox proportional hazards regression model analysis showed that HIV-infected patients in the age groups of 45-59 and ≥60 years (aHR=2.58, 95%CI: 1.26-5.28; aHR=5.00, 95%CI: 2.38-10.51) were more likely to develop malignant tumors. HIV-infected patients with an educational level of senior high school or above (aHR=0.52, 95%CI: 0.29-0.95) and those in the first CD4+T lymphocyte/CD8+T lymphocyte count ratio ≥0.5 (aHR=0.52, 95%CI: 0.28-0.97) were less likely to develop malignant tumors. Conclusions: From 2005 to 2023, the incidence of malignant tumors among HIV-infected people in Taizhou was higher than that of the general population, and most of them were non-AIDS-defining malignancies. It is necessary to strengthen the early screening and diagnosis of malignant tumors among HIV-infected patients.