Comparing the prognostic and predictive utility of serum thymidine kinase 1 and CA 15-3 in patients with hormone receptor positive metastatic breast cancer starting first-line endocrine therapy in SWOG S0226.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: Identify all the mentioned drugs in the given text. Text may or may not contain drug. If they contain more than 1 drug, use ";" as delimiter and join them. ### Input: Comparing the prognostic and predictive utility of serum thymidine kinase 1 and CA 15-3 in patients with hormone receptor positive metastatic breast cancer starting first-line endocrine therapy in SWOG S0226. ### Output: 