Researchers develop personalized ovarian cancer vaccines

Researchers at the University of Connecticut have found a new way to identify protein mutations in cancer cells. The novel method is being used to develop personalized vaccines to treat patients with ovarian cancer.

“This has the potential to dramatically change how we treat cancer,” says Dr. Pramod Srivastava, director of the Carole and Ray Neag Comprehensive Cancer Center at UConn Health and one of the principal investigators on the study. “This research will serve as the basis for the first ever genomics-driven personalised medicine clinical trial in immunotherapy of ovarian cancer, and will begin at UConn Health this fall,” Srivastava says.

 Dr. Angela Kueck, a gynecological oncologist at UConn Health, will run the initial clinical study, once it is approved by the FDA. The research team will sequence DNA from the tumours of 15 to 20 women with ovarian cancer, and use that information to make a personalized vaccine for each woman.

The researchers focused their clinical trial on patients with ovarian cancer because the disease usually responds well to surgery and chemotherapy in the short term, but often returns lethally within a year or two. That gives researchers the perfect window to prepare and administer the new therapeutic vaccines, and also means they may be able to tell within two years or so whether the vaccine made a difference. If the personalized vaccines prove to be safe and feasible, they’ll design a Phase II trial to test its clinical effectiveness by determining whether they prolong patients’ lives.

In order for the immune system to attack cancers, it first has to recognize them. Every cell in the body has a sequence of proteins on its exterior that acts like an ID card or secret handshake, confirming that it’s one of the good guys. These protein sequences, called epitopes, are what the immune system ‘sees’ when it looks at a cell. Cancerous cells have epitopes, too. Since cancer cells originate from the body itself, their epitopes are very similar to those of healthy cells, and the immune system doesn’t recognize them as bad actors that must be destroyed.

But just as even the best spy occasionally slips up on the details, cancer cell epitopes have tiny differences or mistakes that could give them away, if only the immune system knew what to look for.

“We want to break the immune system’s ignorance,” Srivastava says. For example, there could be 1,000 subtle changes in the cancer cell epitopes, but only 10 are “real,” meaning significant to the immune system. To find the real, important differences, Mandoiu, the bioinformatics engineer, took DNA sequences from skin tumours in mice and compared them with DNA from the mice’s healthy tissue.

Previous researchers had done this but looked at how strongly the immune system cells bound to the cancer’s epitopes. This works when making vaccines against viruses, but not for cancers. Instead, Srivastava’s team came up with a novel measure: they looked at how different the cancer epitopes were from the mice’s normal epitopes. And it worked. When mice were inoculated with vaccines made of the cancer epitopes differing the most from normal tissue, they were very resistant to skin cancer.

Theoretically, this approach could work for other cancers, although the research has yet to be done. University of Connecticut