Background and Objective: There are different characteristics of BC in developing countries and developed countries. We intend to study the factors which influence the survival and prognosis of BC between southern China and the United States.
Methods: To study the two groups BC patients in southern China from 2001 to 2016 and SEER database from 1975 to 2016. To register, collect and analyze the clinicopathological features and treatment information.
Results: Our study found that there are significant differences in tumor size, positive lymph node status and KI-67 between southern China and SEER cohort (P<0.000).
Conclusions: The age, tumor size, positive-node and KI-67 may cause the difference of morbidity and mortality of BC patients in southern China and SEER cohort.