You don't need to worry about cancer.
If warts are big and obtrusive, they should be treated. My preference is for a series of
liquidLiquid co-q10
Liquid pedvaxhib
Liquid pred nitrogen sessions. They aren't pleasant, but most people tolerate them just fine, and they're much easier to deal with than aggressive surgery or laser. Perhaps you husband should reconsider.
Best.
Dr. Rockoff