AI Article Synopsis

  • The study focused on immunizing patients with pancreatic cancer against tumor-specific K-ras codon 12 mutations, aiming to investigate safety and efficacy.
  • Patients received a peptide vaccine containing their specific mutation, with no severe toxicities observed, mostly mild reactions at the injection site.
  • Out of 24 vaccinated patients, one showed a specific immune response, while overall survival rates were reported, highlighting a need for more effective vaccine strategies in future research.

Article Abstract

Purpose: Codon 12 mutations of K-ras are frequent in pancreatic adenocarcinoma, and represent potential tumor-specific neoantigens. The objective of this study was to assess the safety and efficacy of immunizing patients with resected pancreatic cancer with a vaccine targeted against their tumor-specific K-ras mutation.

Methods: Patients with resected pancreatic cancer, with K-ras mutations at codon 12, were vaccinated once monthly for 3 months with a 21-mer peptide vaccine containing the corresponding K-ras mutation of the patient's tumor. About 200 μg of peptide vaccine was injected intradermally on day 7 of a 10-day course of intradermal granulocyte macrophage colony-stimulating factor. Toxicity was assessed by National Cancer Institute Common Toxicity Criteria v2.0. Immune responses were evaluated by delayed-type hypersensitivity (DTH) tests and the enzyme-linked immunosorbent spot assays.

Results: Of 62 screened patients, 24 were vaccinated. There were no grade 3-5 vaccine-specific toxicities. The only National Cancer Institute grade 1 and 2 toxicity was erythema at the injection site (94%). Nine patients (25%) were evaluable for immunologic responses. One patient (11%) had a detectable immune response specific to the patient's K-ras mutation, as assessed by DTH. Three patients (13%) displayed a DTH response that was not specific. Median recurrence free survival time was 8.6 months (95% confidence interval, 2.96-19.2) and median overall survival time was 20.3 months (95% confidence interval, 11.6-45.3).

Conclusions: K-ras vaccination for patients with resectable pancreatic adenocarcinoma proved to be safe and tolerable with however no elicitable immunogenicity and unproven efficacy. Future development of adjuvant vaccine therapies should use more immunogenic vaccines.

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Source
http://dx.doi.org/10.1097/COC.0b013e3181e84b1fDOI Listing

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