GB different slant on your story.
Eight guys all played golf together, as of today I believe 6 or 7 of the 8 are dead due to pancreatic cancer. Environmental chemicals are everywhere these days.
The LPGA cut the cancer rate by 2/3 having the women players and staff shower immediately after getting off the Golf Course before interviews etc.
Colon cancer is endemic in Chinese mainland cultures due to the use of cured soy beans and soy byproducts.
i do not believe you are wrong in your assumption/presumption of an environmental cause. It has been more common as we are using more chemicals and processed foods in our daily lives.
Hope all turns out for the best