Asking for suggestion. Course of action.

My father, whose details i have already mentioned, has been diagnosed with poorly differentiated adenocarcinoma a couple of days ago. The local doctors suggest surgery as the tumour has already blocked a substantial portion of the colon, and is rapidly increasing. But since Ranchi, our city, doesn't have a hospital where the surgery can be done, we need suggestions as to which is the best hospital in India where the surgery can be done with the lowest possible risk. Also considering the fact that my father is 82 years old and also has a cardiac stent which was installed in 2011. Also, he has had a history of respiratory trouble. It would be preferable for the hospital to be in Kolkata, for the ease of lodging and finances are not a big trouble. Therefore, i request your help on the matter for our course of action.