Abstract
Abstract Background and objective: Tumor-specific cytotoxic T lymphocytes (CTLs) can be activated in vivo by dendritic cell (DC)-based vaccination. However, clinical responses to the immunotherapy with DC vaccination have only been observed in a minority of patients with solid cancer. In the current study, the clinical efficacy of the DC vaccine pulsed with the peptide derived from breast cancer-associated antigens has been evaluated in the patients with advanced, inoperable breast cancer. Patients and Methods: 21patients with advanced, inoperable breast cancer refractory to standard treatment were entered the study. DCs which were generated from CD14+ monocytes from leukapheresis by 6-day cultivation with granulocyte macrophage-colony stimulating factor (GM-CSF) and interleukin (IL)-4, were matured by OK-432, a streptococcal agent, and were pulsed with the pancreatic cancer-associated antigens, such as WT1, MUC1. These DCs (1 × 107) were intradermally administered more than 5 times at 14-day intervals. Results: Of the 21 patients, complete response (CR) was observed in 0 (0%), partial response (PR) in 2 (9.6%), stable disease (SD) in 7 (33.3%), progressive disease (PD) in 12 (57.1%). Response rate was 9.6%. Tumor control rate was 42.9%. Mean survival time after DC therapy was 514days. Severe side effects of more than grade 3 which were assessed in accordance with NCI-Common Toxicity Criteria v.2.0, were not observed. Conclusions: It was strongly suggested that the DC vaccination pulsed with cancer associated-peptides was safety and effective in the patients with the inoperable breast cancer refractory to standard treatment. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr LB-154. doi:10.1158/1538-7445.AM2011-LB-154
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