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Hello, its Dr. Bob. I'm sorry to read of Angelo's sad condition. I went through a similar situation recently with a much-loved ca,t and my advice is fairly simple: Continue to keep him comfortable and feeling loved until it is quite clear that he's not enjoying his life, then let him go.
As he's losing weight, the chances are very good that the cancer has already spread in his body, so even should he survive the surgery, his long-term outlook would still be dim.
He's had a long life in a loving home, and it just doesn't get better than that for a pet. To hold on to a suffering pet too long can become selfish. Love him while you have him and let him go when the quality of his life is obviously poor.
If I can answer any more questions for you, please let me know.
Warm regards, *****