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|Ref Type||Journal Article|
|Authors||Rahma OE, Ashtar E, Czystowska M, Szajnik ME, Wieckowski E, Bernstein S, Herrin VE, Shams MA, Steinberg SM, Merino M, Gooding W, Visus C, Deleo AB, Wolf JK, Bell JG, Berzofsky JA, Whiteside TL, Khleif SN|
|Title||A gynecologic oncology group phase II trial of two p53 peptide vaccine approaches: subcutaneous injection and intravenous pulsed dendritic cells in high recurrence risk ovarian cancer patients.|
|Journal||Cancer immunology, immunotherapy : CII|
|Abstract Text||Peptide antigens have been administered by different approaches as cancer vaccine therapy, including direct injection or pulsed onto dendritic cells; however, the optimal delivery method is still debatable. In this study, we describe the immune response elicited by two vaccine approaches using the wild-type (wt) p53 vaccine.Twenty-one HLA-A2.1 patients with stage III, IV, or recurrent ovarian cancer overexpressing the p53 protein with no evidence of disease were treated in two cohorts. Arm A received SC wt p53:264-272 peptide admixed with Montanide and GM-CSF. Arm B received wt p53:264-272 peptide-pulsed dendritic cells IV. Interleukin-2 (IL-2) was administered to both cohorts in alternative cycles.Nine of 13 patients (69%) in arm A and 5 of 6 patients (83%) in arm B developed an immunologic response as determined by ELISPOT and tetramer assays. The vaccine caused no serious systemic side effects. IL-2 administration resulted in grade 3 and 4 toxicities in both arms and directly induced the expansion of T regulatory cells. The median overall survival was 40.8 and 29.6 months for arm A and B, respectively; the median progression-free survival was 4.2 and. 8.7 months, respectively.We found that using either vaccination approach generates comparable specific immune responses against the p53 peptide with minimal toxicity. Accordingly, our findings suggest that the use of less demanding SC approach may be as effective. Furthermore, the use of low-dose SC IL-2 as an adjuvant might have interfered with the immune response. Therefore, it may not be needed in future trials.|
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|TP53 wild-type||ovarian cancer||predicted - sensitive||Ad.p53-DC vaccine||Phase I||Actionable||In Phase I and Phase II clinical trials, various forms of p53 gene therapy (such as adenoviral-p53) have been shown to be generally safe and have demonstrated clinical efficacy in patients with ovarian cancer (PMID: 12082455; PMID: 19621448; PMID: 21927947; PMID: 15297186; PMID: 12082456).||15297186 21927947 19621448 12082455 12082456|
|TP53 over exp||ovarian cancer||predicted - sensitive||HLA-A2 p53:264-272 vaccine||Phase I||Actionable||In a Phase I trial, the HLA-A2 p53:264-272 vaccine demonstrated safety and preliminary efficacy in patients with TP53 overexpressing ovarian cancer, resulting in a progression-free survival of 5.5 months and an overall survival of 40.4 months (PMID: 21927947).||21927947|