We went for a 2nd opinion, thank goodness. And, we liked the Dr. here but after surgery and a 6 month round of FOLFOX, metastases developed. His plan was to start FOLFIRI but we decided a second opinion was appropriate because of the apprent growth of metastases during/after chemotherapy. We chose M.D. Anderson in Houston. They confirmed our doctor's recommendation to start FOLFIRI and do it ASAP, but they also asked for a tissue sample from the original surgery in case there was a drug trial that he might be a candidate for.
FOLFIRI proved to cause significant side effects and the Dr. took him off it. About that time M.D. Anderson called his Dr. about the possibility of putting my husband in a new drug trial. His cancer has a mutated BRAF gene which is very resistant to most chemo, that is why it had continued to grow.
The drug trial is Plexxikon PLX4032 which has completed a successful trial on melanoma and is now being tested on other cancers with the BRAF mutation.
We learned that his type of cancer was extremely aggressive and there were not any really good treatments. Without this specialized testing, we would've continued down a chemo path that would likely not have worked. Instead, he is on a drug trial that holds real hope for his type of cancer.
So, I would say that if you are concerned, a 2nd opinion at a leading colon cancer hospital is appropriate. They know some things that are not yet in general oncological practice. It could save his life.