SESSION TYPE: Lung Cancer III
PRESENTED ON: Tuesday, October 23, 2012 at 02:45 PM - 04:15 PM
PURPOSE: Since the prognosis of small cell lung cancer (SCLC) remains poor, development of new therapeutic approaches, including immunotherapies, would be desirable. In the current study, to evaluate immunological responses in refractory SCLC patients, we conducted a small scale phase II clinical trial of personalized peptide vaccination (PPV), in which vaccine antigens are selected based on pre-existing host immunity.
METHODS: Ten refractory SCLC patients, who had failed to respond to chemo- and/or chemoradiotherapies(median number of regimens, 2.5; median duration,20.5 months), were enrolled. A maximum of four human leukocyte antigen (HLA)-matched peptides showing higher antigenspecific humoral responses were subcutaneously administered (weekly for six consecutive weeks and then bi-weekly thereafter).
RESULTS: PPV was terminated before the 3rd administration in four patients because of rapid disease progression, whereas the remaining six patients completed at least one cycle (six times) of vaccinations. Peptide-specific immunological boosting was observed in all of the six patients at the end of the first cycle of vaccinations, with their survival time of 25, 24.5 (alive), 10(alive), 9.5, 6.5, and 6 months. Number of previous chemotherapy regimens and frequency of CD3+CD26+ cells in peripheral blood were potentially prognostic in the vaccinated patients(hazard ratio [HR] = 2.540, 95% confidence interval [CI] = 1.188- 5.431, P = 0.016; HR = 0.941, 95% CI = 0.878-1.008, P = 0.084; respectively).
CONCLUSIONS: Based on the feasible immune responses in refractory SCLC patients who received at least one cycle (six times) of vaccinations, PPV could be recommended for a next stage of larger- scale, prospective clinical trials.
CLINICAL IMPLICATIONS: PPV might be one of the new treatment of small cell lung cancer.
DISCLOSURE: The following authors have nothing to disclose: Yasuhiro Terazaki, Takashi Mine, Yoshiyama Koichi, Masahiro Mitsuoka, Shinzo Takamori, Akira Yamada, Tetsuro Sasada, Kyogo Itho, Kazuo Shirouzu
No Product/Research Disclosure InformationDepartment of Surgery, Kurume University School of Medicine, Kurume, Japan