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 barosperse
Liquid calcium with vitamin d
Liquid co-q10
Liquid e-z paque
Liquid pedvaxhib
Liquid polibar
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