That is not a good analogy. Dry rot would be analogous to cells ceasing to replicate and just dying.
With cancer, cells continue to replicate, it is just that the replication process has an error resulting in bad copies.
Now you could be right in that the C only minimizes the replication errors and they will return with the reduction in C.
Beg to differ: If you fail to remove the conditions which cause cancer, it will return.
Same applies to dry rot.
Depends, of course, on whether you believe cancer is preventable. I know people who reversed their cancers naturally. Thus, cancer is preventable, just like dry rot.