Cancer mutations are like that. As oncology moves toward precision medicine – the idea that if we knew exactly which genetic mutations make a particular cancer tick, we could pick exactly the right treatments – oncologists have to keep up with an ever-expanding library of mutations and the drugs that might foil them. The number of cancer research papers published increases every year; there were about 35,000 published in 2015 just in the U.S. It’s far more than any one person can keep up with.
In the same way that a university has research librarians who keep up with the literature in specific fields, JAX has experts who keep up with cancer gene and drug research, even studies that are ongoing and not yet published.
Bull’s Eye Treatment
Imagine that a patient has surgery or a needle biopsy to diagnose a tumor. It’s a particularly ugly tumor, the surgeon, oncologist, and pathologist all agree. Invasive, spreading, and perhaps this isn’t the first time this patient has had to come in for cancer surgery. The tumor is sampled and sent for genetic testing. In about two weeks, the results come back: there are three genetic variants in the tumor that might be drug targets.
“The goal is to define the optimal treatment regimen for each individual patient” who may not have good options otherwise, says Dr. Ketan R. Bulsara, chief of neurosurgery at UConn Health and one of the principal investigators on the project.
The focus is always on the patient. But behind the scenes, there’s an entire team of researchers whose work goes into the genetic tumor report. Scientists at JAX Clinical Laboratory sequence the tumor’s genetic code and report information on more than 200 cancer-related genes. The genes were picked because they are associated with both malignancy and potential drug treatments. Any mutations or variants in these genes might be a clue to the cancer’s weakness. Or a red herring.
Be a part of cancer treatment at UConn
The clinical genomic curators are specialists in fields such as molecular oncology and oncological pharmacology. They’re dedicated to keeping up with the literature on cancer genes and the drugs that target them. More and more of these drug-gene connections are being discovered every day. It’s exciting, but the sheer volume of papers can be overwhelming. Navigating that ocean of scientific papers is the medical curators’ full-time job. They’re like librarians curating a Boston Public Library-size collection of genes and drugs with no cross references in the card catalog and only an imperfect search function. The hope is that just as a good librarian’s knowledge of the subject matter can unearth texts a researcher would never otherwise find, a medical curator’s grasp of oncological genetics and pharmacology can identify potential treatments that would otherwise remain obscure.
Each mutation identified by the genetic panel might require 10 to 20 scientific publications to understand. Once the curators have a handle on the variants’ significance, the clinical laboratory decides which two or three should be described in the report to the oncologist.
Sifting the information down to something relevant and digestible is the ultimate goal.
“Today, all this information is disorganized and may not all be in the oncologist’s head. We’re trying to bring it together,” says Jens Rueter, medical director for the Maine Cancer Genomics Initiative.
The ideal outcome of a tumor genetic analysis would be to identify a mutation such as the HER2 gene that is turned on in the most aggressive breast cancers. HER2 is responsible for the cancer’s malignancy. But it’s also the cancer’s Achilles’ heel. Once drugs were developed to block the HER2 protein, survival rates climbed sharply.
The goal of the Maine Cancer Genomics Initiative is to enable oncologists to identify other drug-gene connections as potent as the ones found for HER2. Although more and more of these drug-gene connections are being discovered, it remains difficult to provide a patient with access to these drugs. Many of them are only available if a patient participates in a clinical trial. And often, there are barriers to accessing clinical trials, and getting drugs off-label is the only way to get patients to treatments. That’s another benefit that Antov, Bulsara, and Rueter hope UConn Health’s collaboration with JAX will bring.
Ultimately, the researchers hope to demonstrate that this approach leads to better outcomes for patients. During the past year more than 350 patients and 70 oncology practitioners (more than 80 percent of the Maine oncology community) enrolled in the Maine Cancer Genomics Initiative study protocol. A few patients have already been offered a targeted treatment through a trial or a compassionate drug access program as a result of enrollment in the program. And Maine health care professionals have logged more than 1,200 certified education hours through 35 genomic tumor boards, online modules, and annual forums held by JAX.
So far, five patients have done this at UConn Health within the last two months. Generous donors have given enough to fund 20 more.
UConn Health already has the infrastructure to do this, in particular a biorepository for tumors set up by Neag Cancer Center director Dr. Pramod Srivastava and pathologist Dr. Melinda Sanders. With that foundation and support from UConn Medical School dean Dr. Bruce Liang and UConn Health CEO Dr. Andrew Agwunobi, the program was piloted in the Department of Surgery by Bulsara, its chief of neurosurgery, with support from Department of Surgery chairman Dr. David McFadden, hematology, and oncology chief Dr. Susan Tannenbaum, anatomical pathology chief Dr. Qian Wu, and JAX Clinical Laboratory director Honey Reddi.
If the UConn Health–JAX initiative does prove its feasibility, the approach will continue to spread and become a standard of care.
The hope is that just as a good librarian’s knowledge of the subject matter can unearth texts a researcher would never otherwise find, a medical curator’s grasp of oncological genetics and pharmacology can identify potential treatments that would otherwise remain obscure.
This story first appeared in the Fall 2018 issue of UConn Health Journal. For more stories on UConn Health research and clinical innovations, visit healthjournal.uconn.edu.