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Multivariate regression analysis. Cox proportional hazards model for overall survival. Bold writing: significant results (p < 0.05). *Metastasis at diagnosis was documented either synchronous (M1) or metachronous (M0). Abbreviations: BMI body mass index, CCI Charlson Comorbidity Index, CI confidence interval, HR hazard ratio, HER2 human epidermal growth factor receptor 2, metachr metachronous, synchr synchronous
