Abstract
PURPOSE: This study aimed to evaluate the influence of hepatitis B virus (HBV) infection status on the initial metastatic pattern and prognosis in metastatic breast cancer (MBC). METHODS: MBC patients admitted to Chongqing University Cancer Hospital between January 2011 and December 2019 were enrolled. The association of HBV infection status with clinicopathological features was analyzed. The impact of HBV infection status on initial metastatic pattern and survival was evaluated. RESULTS: A total of 1124 patients with MBC, including 310 with de novo (cohort A) and 814 with relapsed metastatic disease (cohort B), were eligible for this study. Seropositive HBsAg was identified in 28 (9.0%) and 68 (8.4%) patients in cohort A and B, respectively. The clinicopathological features are similar between HBsAg-positive and HBsAg-negative patients. There was no significant association of HBV infection status with the rate of metastasis at each site in de novo and relapsed MBC. HBsAg-positive patients tended to have longer metastasis-free survival (MFS) and/or overall survival (OS) time, but it was not the independent prognostic factor. CONCLUSION: In conclusion, HBV infection status does not influence the initial metastatic pattern and the prognosis of MBC patients.