Differences in treatment outcomes in relation to level of human epidermal growth factor receptor-2 (HER2) expression, HER2-low vs HER2-zero, in patients with hormone receptor-positive metastatic breast cancer treated with cyclin dependent kinase CDK4/6 inhibitors: A systematic review and meta-analysis.
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: Differences in treatment outcomes in relation to level of human epidermal growth factor receptor-2 (HER2) expression, HER2-low vs HER2-zero, in patients with hormone receptor-positive metastatic breast cancer treated with cyclin dependent kinase CDK4/6 inhibitors: A systematic review and meta-analysis. ### Output: 