Husband’s CA19-9 plunged by 90%

Hi,
My husband just finished 11 rounds of chemo with oxaliplatin and irinitican. During this time, he also has been working with a nutritionist to clean up his diet, taking some Rick Simpson cannibis oil, doing red light theray and high dose Vitamin C drips. His CA19-9 plunged by 90% during the six months and after a recent CT scan, the surgeon scheduled Whipple surgery. The surgeon feels there is a more than 50% chance he will be able to remove the entire mass. Leading up to surgery, my husband is gaining strength after chemo and keeping up with the holistic therapies he has been doing during his treatment regime. The surgeon expressed that only 15% of his patients have the response rate to the chemo my husband has had. We believe that all of his complimentary efforts are paying off. Anyone else have this kind of success with chemo alone?