They still are not sure. The gallbladder walls are thickening so they suspect it may be where the cancer is coming from. On gem sis since November, Seems to slow the growth of lymph node cancer but switch me to folfoxin August, a bit tougher but hope to shrink the tumors down and then talk about radiation. They said if they remove the gallbladder in 70 percent of cases cancer returns so they are not pursuing that option.