Praveen,
I have to agree with Joanna that the treatment protocol sounds as aggressive as possible. In some repects it sounds like they are using more advanced drugs then he would have received in the US, the Grafeel for instance (although they also have a similar drug in the US (the name slips my mind, "Nuelasta" maybe).

What Nelie mentioned about the "ethyol" (the generic name for Amofostine may be true - they both have the letters "fost" in them. Sometimes that's the clue. It's main use is to preserve the salivary glands but it can be a very difficult to tolerate treatment.

From what you have described in the way of his treatment your guess at his staging sounds about right. We have many advanced stage cancer survivors here - do not give up hope.