Treating Cancer in Siamese Cat

My cat was examined for possibly having cancer in the gland area!
Besides removing most of his teeth, how suggested by the doctor, are there other alternatives to saving him?

Hello!

My name is Dina and I am a pet owner of a Siamese cat. He is only 4 years old but might be diagnosed with infectious cancer in the area of his teeth. The doctor who has seen him,took his blood work and said that everything looks fine and then he suggested to consider surgery to remove almost all his teeth.  

He has prescribed him Clavamax but the cat has been vomiting with blood. Following instructions of the doctor, I stopped giving him the medication.
Is the blood normal, as part of the side effect? Is this medication harming him in this case?

Is there anything that could be done to right now or considered to save little guy?

THANK YOU!!!

[Jim Humphries, B.S., D.V.M.]

I'm confused so decided to post a comment to ask for more information.  

Cancer.  are you sure they said Cancer?  
Cancer of the Gland Area?  What does that mean?  There are glands (like lymph glands) all through the body.  Do they mean lymph glands of the neck and jaw?  
What does the cancer have to do with the teeth?  I'm very confused about this comment.
Could this be infection of the gums?  Would they have said the word "CanKER"?
How was this diagnosed?  Biopsy? Visual? Aspiration and Cytology?
Before anyone removes all the teeth, let's be very sure of all this.  I think it would be very rare to have the need to remove all teeth.
No, Clavamox should absolutely not cause bloody vomiting.  There may be something else going on here.  Even if he could not tolerate that antibiotic, there are others to try.  

I suspect we don't have the whole story.  Please try to give us all the information you can.  We would like to help.