- Patients with advanced Multiple Myeloma that meet the eligibility requirements for mobilization/debulking with Cytoxan/VP-16/G-CSF, Cytoxan/Taxol/G-CSF, or Cytoxan/G-CSF (according to protocol 506.03); if clinically indicated a lower dose of cytoxan than 4g/m2 may be used for mobilization based on the attending's discretion; also, if the patients had previously collected PBSC of sufficient number in the past and meet the other eligibility requirements, they may be entered on this study after approval by the PI