Patients with a variety of different types of cancerous tumors that have spread (metastasized) and whose conditions have not improved with stand therapy, will be eligible to participate. Those patients selected to participate in the study will undergo a procedure known as a "mini-transplant". The mini-transplant is a transplantation of stem-cells collected from a sibling (brother or sister) of the patient. Unlike traditional bone marrow transplants, the mini-transplant does not require intense chemotherapy or radiation therapy. Because of this, patients experience fewer and less severe side effects.