Also found this
"If you suspect your new puppy has a RV there are holistic ways of preventing infection. It is also very important that this pup is not spayed until she has her first heat cycle because most times the vulva will correct itself as a result of that heat cycle (sometimes it takes 2 cycles to correct but most often only one cycle). If you spay prior to the first heat you could be subjecting the pup to a lifetime of infections. Be sure and ask your vet if they have ever dealt with this as there are vets who have never seen a case and would not know what they are looking at. If that is the case please seek out another vet so you are not advised to spay your pup prior to first heat.
For those afraid to wait to spay because they have read about cancer and infections, please see this link. The risk starts to go up after age 2.5 and most dogs will have a first heat by 1 year, although some will go a bit beyond that"
I think I answered my own question.... the risk or cancer is far less than the risk of infections.