Christian Science: Question 2!

After reading this thread, I began discussing it with my fiance. We are not christians, and do not have extensive knowledge of the specifics for chirstian science, but from this talk, I kind of got this idea.

People don’t really get sick, they only have a mental problem and think that they are sick. After praying, they are reminded that they are spirtual beings, not physical beings, and this can remove illness(?)

The original discussion was basically about animals, but this brings me to my point…

How does Christian science explain cancer? or tumors? or anything of that sort where there is scientific proof of ailments? Am I on to something here, or am I just missing the point of Christian Science? Or just missing the point all together?