I need to know the answer to this question

I'm pretty sure it is sex-linked recessive.

Explanation:

Since unaffected parents had effected children you know that it has to be recessive, and since predominantly males are effected, this is a sign that it is sex-linked because males are more likely to inherit an x-linked trait.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.

not always but somethings can be reproduced in a laboratory.