Spotzy, I'm sorry for the loss of your friend but as you say the oncologist made a mistake. The only monoclonal that I know of that is being used for Waldenstroms is Rituximab. However, Campath does not wipe out bone marrow. It does destroy lymphocytes (white blood cells) but not the marrow itself.
But as you rightly point out anyone considering an extreme form of treatment such as this should get as much information as they can.
Marie, Lymphocyte count returns to normal levels within about six months after treatment.
Do not go gentle into that good night. Rage, rage against the dying of the light.