Help my dad get his treatment

Hi guys 2 years ago my dad got diagnosed with head and neck cancer they managed to cure the neck cancer but unfortunately it is now in the lungs. He started his chemo last week but it is makin his white cells to low and very sick so unfortunately he can not have it anymore. There is another one he can try which is an immunetherapy but it is going to cost $3000 every 3weeks. So please if you can help in anyway it will be greatly appreciated. This is pretty much his last hope