I am sorry to hear about your cat.
My name is Rebecca. I am a veterinarian, and will do my best to help.
Which glands was the cancer in? Mammary glands, anal glands?
How old is your cat?
Was a biopsy done?
If this is a female cat, and it is in the mammary (milk) glands, it can be very serious. This type of cancer tends to spread internally to the lungs and lymph nodes, and it tends to grow back after surgery. If it was not all removed the first time, a second surgery should be done to get it all.
I am not seeing responses from you. I hope you can see what I am writing!
I can try to connect another way if I do not hear from you.