Mutated Ras-transfected, EBV-transformed lymphoblastoid cell lines as a model tumor vaccine for boosting T-cell responses against pancreatic cancer: a pilot trial.

Abstract:

:Genetically modified lymphoblastoid cell lines (LCL) have been shown to be an attractive alternative source of antigen-presenting cells for cancer vaccination in vitro. We tested their application in patients with pancreatic cancer in a phase I clinical trial. As a model tumor antigen, we selected the point-mutated (codon 12) Ki-Ras p21 oncogene (muRas) frequently (∼85%) present in pancreatic adenocarcinoma. Autologous LCLs were established in vitro by spontaneous outgrowth from peripheral blood lymphocytes of seven pancreatic carcinoma patients and were genetically modified with an episomal Epstein-Barr virus (EBV)-based expression vector to express muRas (muRas-LCL). Weekly vaccinations with subcutaneous injection of 5×10(6) muRas-LCL were done. In six of seven patients, therapeutic vaccination elicited a T-cell response with an increase in the frequency of muRas-specific precursor cytotoxic T lymphocytes in the peripheral blood and positive delayed-type hypersensitivity reactions at the injection site. Besides local reactions and flu-like symptoms, there were no signs of toxicity and no acute EBV infection, onset of EBV-associated lymphoma, or other severe complications. A clinical response (stable disease) was observed for a short time period (2-4 months) in four of seven patients (57%), mostly in earlier tumor stages. Our results indicate that LCL presenting genetically modified antigen represent a valuable and easily available tool for in vivo autologous tumor vaccination. LCL can be transfected with any known tumor antigen and therefore should be further clinically investigated.

journal_name

Hum Gene Ther

journal_title

Human gene therapy

authors

Kubuschok B,Pfreundschuh M,Breit R,Hartmann F,Sester M,Gärtner B,König J,Murawski N,Held G,Zwick C,Neumann F

doi

10.1089/hum.2011.153

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

1224-36

issue

12

eissn

1043-0342

issn

1557-7422

journal_volume

23

pub_type

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