I've personally seen a tumor shrink rapidly in one of my rescued Egyptian Spiny Mice, I'd simply give him 1 or 2 organic Almonds and an organic Apple core 'W/ Pips' a day. The vet who had previously told me 'nothing could be done' other then pts when too uncomfortable, later said 'well maybe it was not a tumor but something else' when I showed her it Was gone. Unfortunately it didn't work with an elderly common mouse I had, sadly I didn't have any apricot pips to try😔.