“Nitric oxide delivered by inflammatory cells, in particular, is important in causing changes in intestinal epithelial cells, setting the stage for cancer development,”
This study doesn't really say much...But I interperet this as N.O. MAY be needed to nurish a development of cancer. In other words, Not so much that N.O. causes cancer in any way but that the cancer may not survive/develop without N.O.
I could see where this could possibly lead to N.O. blockers being used as specific cancer treatment, much like A.I.'s are used for breast cancer treatment.
As far as N.O. boosters, they may increase free radicals, so supplementing with anti oxidants might be a good idea if you are a frequent user.