I think the answer it’s a Hereditary genetic trait, or non-hereditary cause their the ones who have the genetic components to give it to offspring but not be effected themselves? Best I could answer for you sorry goodluck
Step-by-step explanation:
It’s a mutation of the RB1 gene , mutations that are present in all of the body genetically down to your reproductive systems. It’s a eye cancer developed very young (ages up to 3-5 a lot) it’s a heredity gene to passed down on offspring and suggested not to have children with genetic diseases like this.