Fox Chase Cancer Center Conducts Important Study To Determine Genetic Link to Lung Cancer Risk in Women
PHILADELPHIA (November 12, 1999) -- Fox Chase Cancer Center is conducting a new prevention study on lung cancer susceptibility among high-risk female smokers. It is estimated that 68,000 American women will die from lung cancer this year, making lung cancer the number one cancer killer among this group. Early detection is key, but difficult because there is no screening readily available and symptoms often do not appear until the cancer is advanced and the disease has spread.
Michael Unger, M.D., director of pulmonary cancer detection and prevention at Fox Chase, is leading the study. "We can screen for breast cancer using mammography, cervical cancer with the Pap test and prostate cancer with the PSA blood test. However, there are no acceptable ways of screening and discovering patients with preinvasive and early malignant stages of lung cancer," said Dr. Unger. "If treated in its early stages, lung cancer survival and cure rates are greatly improved when compared with cases detected later."
Women with a significant history of cigarette smoking are at an increased risk of developing lung cancer. This new study will determine if there is a link between cigarette smoking, women with a particular gene mutation and abnormal findings determined during sputum (mucus coughed up from the lungs) evaluation and bronchoscopy (examination of the lung's main airways).
Research conducted in the lab of Fox Chase scientist Margie Clapper, Ph.D., comparing lung cancer patients and healthy individuals, revealed an association between an increased risk of lung cancer and the presence of the CYP1A1 gene mutation. This association was only significant for females.
Data collected suggests that CYP1A1 may serve as a biological marker of lung cancer risk in women and, therefore, as a potential marker for selecting a target group of women most appropriate for screening.
Eligible participants for the study are women, 25 years of age or older. Additional requirements include the following:
- Must have at least a 15 pack year smoking history (A pack year is the number of packs smoked per day multiplied by the number of years a woman has smoked.)
- Must be a current smoker defined as: at least pack per day within the last year and/or stopped smoking within the past two months
- Must not be pregnant or lactating
- Must not have received radiation therapy to the chest area or had chemotherapy within the past six months
A woman who qualifies for the study will complete questionnaires and have a physical examination as well as clinical testing to make sure her medical condition is good. She will be asked to produce sputum for analysis. Then a physician will look at the airways of the lung during bronchoscopy and LIFE (lung imaging fluorescence endoscopy). Areas that appear suspicious will be biopsied for further evaluation.
LIFE is used in addition to routine bronchoscopy. Its fluorescent light identifies pre-malignant and early malignant lesions as small as one to two millimeters, undetectable by any other technique. Such tiny tumors would be missed by routine bronchoscopy alone - the standard procedure using a lighted tube that physicians ordinarily use to diagnose thoracic tumors.
If the results of this study verify a link between cigarette smoking, the CYP1A1 gene mutation and abnormal findings in sputum, then CYP1A1 may be used as a marker to indicate high-risk women. A simple blood test to detect the gene mutation would determine which women are at highest risk for lung cancer and therefore warrant screening. Future studies are still required to continue working toward an effective method of early detection of lung cancer.
Since it is too early to determine the significance of this gene mutation in terms of lung cancer risk, the women who participate in the study will not be informed about their CYP1A1 status.
Women diagnosed with premalignant changes in the lung lining through this study will be offered participation in a lung chemoprevention trial. Patients diagnosed with minimally invasive carcinoma will be offered the opportunity to participate in photodynamic therapy (PDT), a technique using activation of a special photosensitizer by laser minimizing damage to normal tissues; brachytherapy, a type of radiation treatment; and surgical resection studies.
For more information about the study or to find out how to enroll, call 1-800-ENROLL-ME (1-800-367-6556).
Fox Chase Cancer Center is one of 37 National Cancer Institute-designated comprehensive cancer centers in the nation. The Center's activities include basic and clinical research; prevention, detection and treatment of cancer; and community outreach programs.
Fox Chase Cancer Center, part of Temple University Health System, is one of the leading cancer research and treatment centers in the United States. Founded in 1904 in Philadelphia as one of the nation’s first cancer hospitals, Fox Chase also was among the first institutions to receive the National Cancer Institute’s prestigious comprehensive cancer center designation in 1974. Fox Chase researchers have won the highest awards in their fields, including two Nobel Prizes. Fox Chase physicians are routinely recognized in national rankings, and the Center’s nursing program has achieved Magnet status for excellence three consecutive times. Fox Chase conducts a broad array of nationally competitive basic, translational, and clinical research and oversees programs in cancer prevention, detection, survivorship, and community outreach. For more information, call 1-888-FOX-CHASE (1-888-369-2427).