If azoospermic men are more likely to get cancer then are people who lost both testicles at same risk? please explain.

2.2% risk of cancer: The Stanford study which found increased cancer risk in azoospermic men did not evaluate men who were castrated (is that which you mean by "lost both testicles"?) Of course a man who has no testicles, can not get testicular cancer (unless they were removed FOR testicular cancer). Castrated men have a lower risk of prostate cancer due to lack of testosterone.