211P - Is axillary lymph node dissection necessary in breast cancer patients with mastectomy and false-negative frozen section in sentinel lymph node biopsy?
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: 211P - Is axillary lymph node dissection necessary in breast cancer patients with mastectomy and false-negative frozen section in sentinel lymph node biopsy? ### Output: 