a. Low-grade non-Hodgkin's lymphoma or plasma cell neoplasm with either of the following, and with stable disease or better prior to transplantation: i. Progressed during multiagent therapy, failed at least two prior therapies (excluding single agent rituximab), or there is evidence of prior transformation ii. SLL or CLL with 11q or 17p deletion or with progression < 6 months after a purine analog-containing regimen