DALLAS - May 1, 2014 - Two UT Southwestern doctors have received more than a half-million dollars in grants from the Department of Defense for innovative studies on lung cancer pathways and to test the effectiveness of a potentially less expensive drug therapy.
"We think tumors hijack the hedgehog signaling pathway that is normally active during development and in the repair of injured tissues and then use the pathway for their own purpose, which is to grow," said Dr. Kim, who received a Career Development Award designed to encourage and assist promising researchers in the early stages of their careers. "We will test the idea that interfering with the hedgehog pathway will disrupt communication between tumor cells and their surrounding environment and thus slow the cancer's growth."
Originally developed as an anti-fungal medication, itraconazole is less expensive than many cancer drugs and already approved by the Food and Drug Administration for non-cancer treatments in thousands of patients, so its effect on people is well known and the drug has an established safety record.
"The repurposing of an existing drug such as itraconazole is an excellent opportunity for oncology drug development," said Dr. Gerber, co-leader of the Experimental Therapeutics Program in the Harold C. Simmons Comprehensive Cancer Center at UT Southwestern. "Because the drug already has an established safety record and dosing regimen, we can focus on the drug's efficacy and biologic effects early on."
All of the hedgehog pathway inhibitors that have been developed for cancer are still on patent and cost several thousand dollars per month, Dr. Kim said. Itraconazole, on the other hand, costs a fraction of these other agents, said Dr. Gerber.
Itraconazole is considered promising because the drug also appears to inhibit angiogenesis, which is the growth of new blood vessels required to deliver oxygen and nutrients to cancer cells. Cancer researchers have long focused on targeting angiogenesis as a way of stopping tumor development.
Dr. Gerber's planned study will use blood tests, tumor biopsies, and MRI scans before and after itraconazole therapy to determine the drug's effects on angiogenesis and the hedgehog pathway. In addition, researchers will track itraconazole levels in blood and tumor tissue, and determine if the tests can predict which patients are most likely to benefit from itraconazole therapy.
The Department of Defense has begun funding research to fend off expected increases in lung cancer among veterans. Compared to civilians, veterans have twice the incidence of lung cancer and have lower survival rates from the disease, Dr. Gerber said. According to a 2009 Institute of Medicine estimate, just over 20 percent of the U.S. population smokes, while 22 percent of veterans smoke and 32 percent of active-duty military personnel smoke.
Other faculty taking part in the studies include Dr. Kemp Kernstine, Professor and Chief of the Division of Thoracic Surgery in the Department of Cardiovascular and Thoracic Surgery; Dr. Rolf Brekken, Associate Professor of Surgery and principal investigator in the Nancy B. and Jake L. Hamon Center for Therapeutic Oncology Research; Dr. Robert Lenkinski, Professor of Radiology and the Advanced Imaging Research Center; and Dr. Richard Leff, Professor and Senior Associate Dean for Clinical/Translational Research at Texas Tech University Health Sciences Center School of Pharmacy and Founding Director of the Clinical Pharmacology & Experimental Therapeutics Center.
Drs. Gerber, Kim, Kernstine, Brekken and Lenkinski are members of UT Southwestern's Harold C. Simmons Comprehensive Cancer Center, which includes 13 major cancer care programs with a focus on treating the whole patient with innovative treatments, while fostering groundbreaking basic research that has the potential to improve patient care and prevention of cancer worldwide. In addition, the Center's education and training programs support and develop the next generation of cancer researchers and clinicians.
About UT Southwestern Medical Center
UT Southwestern, one of the premier academic medical centers in the nation, integrates pioneering biomedical research with exceptional clinical care and education. The institution's faculty includes many distinguished members, including five who have been awarded Nobel Prizes since 1985. Numbering more than 2,700, the faculty is responsible for groundbreaking medical advances and is committed to translating science-driven research quickly to new clinical treatments. UT Southwestern physicians provide medical care in 40 specialties to nearly 91,000 hospitalized patients and oversee more than 2 million outpatient visits a year.