My rat sisters both got tumors at ~18 months. I asked the vet about hormone blockers since my rat Flipper didn’t get much benefit from surgery. For about $500 she put a ferret implant called deslorenen between their scapula. #2 is 2 3/4 yrs now, #1 died at 2 1/4 yrs vet-us.virbac.com/home/product...

SUPRELORIN® F (deslorelin acetate) Implant (4.7 mg)

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$500 is a lot of money but my stinker tells me she is worth it everyday. Her sister’s tumors grew fast starting at about 25 months and killed her in 8 weeks. There are a few studies out there, but it’s a gamble. We got lucky.