Progression-free survival as a surrogate endpoint of overall survival in advanced biliary tract cancer: A meta-analysis of randomized trials and individual-patient level correlation.
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: Progression-free survival as a surrogate endpoint of overall survival in advanced biliary tract cancer: A meta-analysis of randomized trials and individual-patient level correlation. ### Output: 