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[–] NeoGoat ago 

I've heard, and it sounds reasonable, that biopsy can help it spread, as cells break loose during the process. I would think surgery might have similar problems, but it does remove the bulk of the tumor. One main problem with chemotherapy is it often knocks down the immune system which is needed to fight any remaining cancer cells. Also, I understand "survival" is defined as living 5 yrs from diagnosis; if you die 5 yrs and 1 day later, the treatment is still documented as having made you survive.