Please do not directly associate silver affinity with being silver loving.
There are numerous chemical substances that will bind to silver that may be produced within certain cells.
The binding of certain cells to silver could just as easily suppress the tumor growth as it could increase the growth. In fact, it is highly unlikely that the silver would increase the growth of the tumor in any case.
The difference is in whether the affinity causes cancer, NO, or whether the cancer creates compounds that will bind to silver.