[Characteristics and prognosis of female breast cancer in Guangzhou, 2008-2017].

Abstract

Objective: To describe the distributions of demographic and clinic pathological characteristics and relations with survival on female breast cancer patients in Guangzhou from 2008 to 2017. Methods: The baseline information of the subjects was obtained from the Guangzhou cancer registry and the outcomes were from the Cancer Follow-up System of Guangzhou. Kaplan-Meier was used to calculate the 1-, 3-, 5-year overall survival rates. Univariate and multivariate Cox proportional hazards regression models were used to identify the factors related to the overall survival. Results: Among the 12 465 breast cancer patients recruited in the study, the average age at diagnosis was 53.9 years old, with those aged 45 to 54 making up the largest proportion (43.9%). Only 15.6% of the patients had college or above degrees. Patients with normal BMI accounted for 78.2%. Most of the patients (90.0%) had received surgical treatment. Invasive ductal carcinoma appeared the most common histologic type, accounting for 82.3%. Among the 2 640 patients diagnosed in the four large hospitals, clinical stages 0-Ⅰ, Ⅱ, Ⅲ and Ⅳ accounted for 35.0%, 44.8%, 17.2% and 3.0%, respectively. The proportions of ER-positive, PR-positive and HER-2 positive breast cancer were 79.5%, 70.8%, and 19.2%, respectively. In terms of subtypes, Luminal B was the most common one, accounted for 53.3%. The 1-, 3- and 5-year overall survival rates were 99.0%, 95.3% and 92.1%, respectively. Results from the multivariate analysis indicated that factors as: age over 55 years old at diagnosis, advanced TNM stage, ER negative, PR negative, Luminal B subtype and triple-negative subtype were associated with poorer prognosis. Conclusions: Compared with the previous hospital-based studies in China, this population-based study revealed that the proportions of patients with advanced age, early clinical stage or ER positive breast cancer were relatively high and the overall survival rate for breast cancer was higher than that in the previous studies. Relationships between characteristics and prognosis of breast cancer were consistent with the previous findings.