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2-step immunotherapy attacks advanced ovarian cancer
Date:1/31/2013

endritic cell vaccine created from tissue in the patients' own tumor, which was stored at time of surgery. All of these women's cancers had progressed on standard of care chemotherapy.

In the first segment of the study, the team prepared an individualized dendritic cell vaccine for each patient. They harvested dendritic cells from each patient using apheresis, the same process volunteers go through when they donate platelets or other blood products such as those collected for stem cell transplants. Kandalaft and colleagues then exposed each patient's dendritic cells to tumor extract produced from the woman's own tumor, which teaches the dendritic cells who the enemy is. After this priming, the investigators vaccinated each patient with her own dendritic cells and gave them a combination chemotherapy regimen of bevacizumab and cyclophosphamide. Because dendritic cells are like the generals of the immune system, they then induce other immune cells to take up the fight.

Of the six patients who received the dendritic cell vaccine, four developed an anti-tumor immune response, indicating that the approach was working. One of those patients had no measurable disease at study entry because all of it had been successfully removed during surgery. She remains in remission today, 42 months following vaccine treatment. The other three who had an immune response to the vaccine still had residual disease and went on to the second segment of treatment.

The team harvested T cells from each of these three women. Using a technique developed at Penn, they grew the cells in the laboratory, expanding their numbers exponentially, and then reintroduced them into each patient after she underwent a lymphodepleting chemotherapy regimen. Because the T cells had already been trained by the dendritic cell vaccine to attack the tumor cells, the adoptive T cell transfer amplifies the anti-tumor immune response.

Two of the women showed a restored immune respon
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Contact: Holly Auer
holly.auer@uphs.upenn.edu
215-349-5659
University of Pennsylvania School of Medicine
Source:Eurekalert

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