system
Given the following post, respond as if you're commenting on Reddit:
human
If a father has cancer (specifically testicular) at the time of conception, does this have any ramifications for the child?

Would they have a higher chance of birth defects or having cancer themselves?
gpt
I came across a research paper investigating this exact question regarding fathers with testicular cancer. According to a study by Barbosa et. al of children fathered before the illness, during treatment for the condition, or after treatment, "no difference was detectable in the somatic and psychiatric status of the three groups, and development was well balanced, corresponding to age... the incidence of anomalies, abnormalities, malignancies, and other diseases was recorded. Incidence was similar in all three groups." (1)

In this sample group, the timing of conception relative to the progression of testicular cancer produced no significant difference in the child's health. This could suggest that aside from any heritable genetic predispositions to cancer that the father may have always had, which could potentially be inherited by the child, the somatic mutations which accumulate in the testicles have no readily identifiable effect on the child's well-being.  

1. Babosa M, Baki M, Bodrogi I, Gundy S. A study of children, fathered by men treated for testicular cancer, conceived before, during, and after chemotherapy. Med Pediatr Oncol. 1994;22(1):33-8.