Abstract:
BACKGROUND AIMS:Adoptive transfer of tumor-specific lymphocytes is a promising strategy in the treatment of cancer. We conducted intratumoral administration of an allogeneic irradiated continuous T-cell line (C-Cure 709) expressing an HLA-A2-restricted MART-1-specific T-cell receptor (TCR) into HLA-A2(+) melanoma patients. The C-Cure 709 cell line is cytotoxic against MART-1(+) HLA-A2(+) melanoma cell lines and secretes several immune stimulatory cytokines upon stimulation. METHODS:Anti-tumor immune responses against the commonly expressed tumor antigen (Ag) MART-1 were longitudinally analyzed in peripheral blood by fluorescence-activated cell sorting (FACS) before and after intratumoral injection of C-Cure 709. RESULTS:No treatment-induced increase in Ag-specific T-cell frequencies was observed in peripheral blood, and the phenotype of MART-1-specific T cells was very stable during the treatment. Interestingly, despite a very stable frequency of MART-1-specific T cells over the course of treatment, clonotype mapping revealed that the response was in fact highly diverse and dynamic, with new clonotypes emerging during treatment. Only a few clonotypes were recurrently detected in consecutive samples. One MART-1-specific T-cell clone disappearing from peripheral blood was later detected in a metastatic lesion. CONCLUSIONS:Sequence analyzes of the CDR3 region revealed conserved structural characteristics in the MART-1-specific TCR used by T-cell clones.
journal_name
Cytotherapyjournal_title
Cytotherapyauthors
Køllgaard T,Duval L,Schmidt H,Kaltoft K,Seremet T,Andersen MH,Maase Hv,Straten Pt,Hadrup SRdoi
10.1080/14653240902923146subject
Has Abstractpub_date
2009-01-01 00:00:00pages
631-41issue
5eissn
1465-3249issn
1477-2566pii
912415145journal_volume
11pub_type
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