Sorry to hear about the incredible rate of cc in your area. I read on this website of veterans who served in vietnam having a very high rate of cc compared to the general public and it was ascribed to parasites that were in that climate. Sometimes when there is cancer clustering it really can be from the water or some other environmental factor. Another very good website dealing specifically with cc is cholangiocarcinoma.org. I have found the members there (as well as here) helpful, well informed and incrediblely compassionate. Be well and good luck.