Hi Ruth, I'm Mike and I was diagnosed Feb2010 and had high paraprotein levels. Mine was found via blood tests at the doctors.
Paraproteins are only part of the picture and up to 8 cycles (the number I had)of Chemotherapy is common. The response that he has had after 4 cycles I think is good progress. My paraprotein levels took longer than most to come down, and only got to 11 by the time they did collection of the stem cells for my SCT. It is better if possible to first consider an Autologus transplant,(one using his own cells)and reading your post, it still sounds infinitely possible that they can do this and just for now a donor won't be necessary.
I had my SCT Christmas day, and although it has taken me a few months to get my strength back, I am doing OK at the moment, so it is not all bad.
I really do think that you should contact either a Clinical Specialist Nurse at your local hospital or contact the number at the top of the page and talk to Ellenwho will give you all the advise and support you need.
If you still have questions I can probably answer from my own experience of treatment.
Mike.