help cancer!

My father has been taken in to hospital and has been told he has a cancerous tumor between the right lung and heart, which has caused a swelling in one of the veins (vena cava)which is causing him breathing problems.

He is on oxygen to help him breath, but the doctors can not decide what type of cancer it is and therefore can not start either chemo or radio.

What alternatives can I start with him, he is in his 80's.

Many thanx.