Effect of chronic diseases on willingness to receive the second COVID-19 vaccine booster dose among cancer patients: A multicenter cross-sectional survey in China.

BACKGROUND: Cancer patients and those with chronic diseases face severe outcomes from SARS-CoV-2 infection. However, their willingness to receive a second booster dose remains low. This study identified factors affecting the willingness of cancer patients with chronic diseases (CPCD) and cancer patients without chronic diseases (non-CPCD) to receive the second COVID-19 booster vaccine dose. METHODS: A multicenter cross-sectional study was conducted across 4 tertiary care hospitals in China. Based on the Health Belief Model, a questionnaire assessed respondents' perceptions of the second booster dose. Multivariable logistic regression analyzed factors influencing the willingness to receive a second vaccine dose. RESULTS: Out of 171 CPCD and 722 non-CPCD, CPCD showed a higher willingness to receive the second booster dose than non-CPCD (46.8% vs 32.3%, P < .001). Factors influencing CPCD's willingness included the belief that vaccination was detrimental to cancer treatment and the perceived higher infection risk compared to healthy individuals. Fear of vaccination's negative impact on cancer treatment was the main factor affecting non-CPCD's willingness (each P < .05). CONCLUSIONS: Different factors influenced the willingness of the 2 groups. Health education interventions should be implemented alongside vaccination, involving patients' relatives and medical staff, for both CPCD and non-CPCD populations. Additionally, health management service interventions should emphasize the benefits of vaccination for CPCD to improve their second dose coverage.