I know that some chemicals related with cancer can be detected by trained dogs in urine, sweat, respiration, or simply smelling that person, but PCR proved more sensitive and is routinely available, detection is as least 3 years in advance to go clinical it finds transcripts of genes used by cancerous cells and not used by normal cells.

In cancer management you may consider systems evolution, some parts of genome are highly conserved, same information for more than 1 billion years, revealed by extensive sequencing of DNA of many species.

About 465MHz is easy to generate but i have no experience, i purchased some broad band power d mos fets up to 2 Ghz, 100w, even I was a child 30 years ago I generated some w in that band, now i see is perfectly possible to use a fiber laser as carrier, and target tumors.