Colon Cancer Research Today is a free monthly online journal that collates and summarizes the latest research about Colon Cancer, including details on causes, treatment, symptoms. | ||||||||
|
Allogeneic nonmyeloablative hematopoietic cell transplantation in metastatic colon cancer: tumor-specific T cells directed to a tumor-associated antigen are generated in vivo during GVHD.Carnevale-Schianca F, Cignetti A, Capaldi A, Vitaggio K, Vallario A, Ricchiardi A, Sperti E, Ferraris R, Gatti M, Grignani G, Rota-Scalabrini D, Geuna M, Fizzotti M, Sangiolo D, Sottile A, De Rosa G, Bucci AR, Lambertenghi-Deliliers G, Benedetti E, Nash R, Aglietta M Laboratory of Tumor Immunology, Division of Medical Oncology, Unit of Radiation Therapy, Institute for Cancer Research and Treatment, IRCC, Strada Provinciale No. 140, Candiolo, Turin, Italy. A pilot study was conducted to evaluate safety and activity of nonmyeloablative allogeneic hematopoietic cell transplantation (HCT) in colorectal carcinoma (CRC) and to determine whether a T-cell response to a tumor-associated antigen (TAA) was induced. Fifteen patients with metastatic CRC underwent HCT from human leukocyte antigen (HLA)-matched siblings after a nonmyeloablative conditioning regimen. All patients engrafted with a median donor T-cell chimerism of 72% at day +56. Eight patients experienced grades II to IV acute graft-versus-host disease (GVHD). Despite progressive disease before HCT, partial remission and disease stabilization longer than 90 days were observed in 1 and 3 patients, respectively. Induction of TAA-specific T cells was evaluated with a carcinoembryonic antigen (CEA)-specific HLA-A(*)0201 pentamer in 6 patients with CRC. CEA-specific CD8(+) T cells were detected in 3 of 3 patients concomitant with GHVD onset, but not in 3 of 3 patients without GVHD. They were also not detected in 9 of 9 control patients with GVHD who received transplants for diagnoses other than CRC. Antitumor activity of CEA-specific T cells was also validated in vitro. In one patient, the induction of CEA-specific T cells was associated with a decrease of serum CEA levels and a partial response. Thus, graft-versus-host reactions associated with allogeneic HCT can trigger the generation of T cells specific for CEA, and this may be associated with a clinical response. Published 21 April 2006 in Blood, 107(9): 3795-803.
© 2004-2008 Colon Cancer Research Today. All Rights Reserved. |
| ||||||
