<qa>  What is the primary objective of metastatic breast cancer treatments?The primary objectives are to evaluate the duration of metastatic breast cancer treatments chemotherapy, hormonal therapy and biological therapies according to biological subtype Luminal A, Luminal B, HER2 positive, triple-negative and to evaluate the number of lines of metastatic breast cancer treatments according to biological subtype Luminal A, Luminal B, HER2 positive, triple-negative. 