The Adenovirus strain used caused tumours in laboratory animals...rats, mice, and hamsters. Ironically the hamsters developed the most aggressive tumours. I haven’t had any problems from the vaccine except that while in the USAF the women wouldn’t leave me alone. It was horrible. Almost every night I had to fend them off....unsuccessfully many times though.
Oddly enough, the same thing happened to me in the USAF, but I never took the vaccine.