Factbox: Colombia’s Santos latest leader treated for cancer

(Reuters) – Colombian President Juan Manuel Santos will undergo surgery for a non-aggressive prostate cancer on Wednesday. Here is a look at some world leaders who have had cancer while in office: * COLOMBIA’S JUAN MANUEL SANTOS: – Colombian President Juan Manuel Santos said he would undergo surgery for a non-aggressive prostate cancer in a health scare that seemed unlikely to derail his government’s imminent talks with Marxist rebels to end decades of war. …