Australia here.
My Father in Law beat Leukemia about 18 months ago after a 2 year battle. As we are aware, you're never totally out of the woods. He now has a blood problem that was brought on by some delayed reaction to the chemo. In order for treatment, they say he has to have the vaccination first. I was blown away, does this sound right? BTW, the treatment of the Chemo reaction, is a low dose Chemo tablet. Doesn't sound right to me.
I think it is a contraindication to give anyone on chemo a vaccine. The chemo weakens your immune system. Mixing vaccines and chemo is not a good idea.
Find a lawyer and sue.
Many cancer centers will not allow you to enter if you've just had a vaccine.