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Ref Type Journal Article
PMID (21328579)
Authors Leffers N, Vermeij R, Hoogeboom BN, Schulze UR, Wolf R, Hamming IE, van der Zee AG, Melief KJ, van der Burg SH, Daemen T, Nijman HW
Title Long-term clinical and immunological effects of p53-SLP® vaccine in patients with ovarian cancer.
Abstract Text Vaccine-induced p53-specific immune responses were previously reported to be associated with improved response to secondary chemotherapy in patients with small cell lung cancer. We investigated long-term clinical and immunological effects of the p53-synthetic long peptide (p53-SLP®) vaccine in patients with recurrent ovarian cancer. Twenty patients were immunized with the p53-SLP® vaccine between July 2006 and August 2007. Follow-up information on patients was obtained. Clinical responses to secondary chemotherapy after p53-SLP® immunizations were determined by computerized tomography and/or tumor marker levels (CA125). Disease-specific survival was compared to a matched historical control group. Immune responses were analyzed by flow cytometry, proliferation assay, interferon gamma (IFN-γ) ELISPOT and/or cytokine bead array. Lymphocytes cultured from skin biopsy were analyzed by flow cytometry and proliferation assay. Of 20 patients treated with the p53-SLP® vaccine, 17 were subsequently treated with chemotherapy. Eight of these patients volunteered another blood sample. No differences in clinical response rates to secondary chemotherapy or disease-specific survival were observed between immunized patients and historical controls (p = 0.925, resp. p = 0.601). p53-specific proliferative responses were observed in 5/8 patients and IFN-γ production in 2/7 patients. Lymphocytes cultured from a prior injection site showing inflammation during chemotherapy did not recognize p53-SLP®. Thus, treatment with the p53-SLP® vaccine does not affect responses to secondary chemotherapy or survival, although p53-specific T-cells do survive chemotherapy.


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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
TP53 wild-type ovarian cancer no benefit p53-SLP vaccine Phase II Actionable In a Phase II trial, p53-SLP vaccine was demonstrated to be safe, well tolerated and to induce p53-specific T-cell responses in ovarian cancer patients; however clinical impact was lacking (PMID: 19621448, PMID: 21328579). 21328579 19621448