Survivin, a member of the
inhibitor of apoptosis protein (IAP) family, is abundantly expressed in most
malignancies, but is hardly detectable in normal adult tissues. Previously we have identified a
human leukocyte antigen (HLA)-A24-restricted antigenic
peptide, survivin-2B80-88 (AYACNTSTL), recognized by CD8(+) cytotoxic T lymphocytes (CTL). Survivin-2B80-88-specific CTL were induced efficiently from peripheral blood mononuclear cells (PBMC) of
oral cancer patients after stimulation with the
peptide in vitro. We conducted a phase I clinical study to evaluate the safety and the efficacy of survivin-2B80-88
peptide vaccination in HLA-A24-positive patients with advanced or recurrent
oral cancer. The
vaccines were given subcutaneously or intratumorally six times at 14-day intervals. Eleven patients were enrolled and 10 patients completed the vaccination protocol. No adverse events were observed in any patients. In two patients, the levels of serum
squamous cell carcinoma (
SCC) antigen decreased transiently during the period of vaccination.
Tumor regression that was compatible with a partial response (PR) was noted in one patient. The remaining nine patients experienced progressive disease (PD). Immunologically, an increase of the
peptide-specific CTL frequency was detected in six of the eight patients evaluated by
HLA-A24/
peptide tetramer analysis. The present clinical trial revealed that survivin-2B
peptide vaccination was safe and had therapeutic potential for
oral cancer patients. However, subsequent clinical trials in combination with various adjuvant drugs will be required to improve the immunological and therapeutic efficacy. This trial was registered with University Hospital Medical Information Network (UMIN) number UMIN000000976.