Combining PSA Testing with Novel Drug Therapy Helps Doctors Identify Hard-to-Diagnose Prostate Cancer
Aug 8, 2012
Researchers have successfully developed and tested a new prostate cancer screening method that uses the combined power of a novel drug therapy and changes in PSA levels over time to identify men with a high PSA who are more likely to have aggressive prostate cancer despite negative biopsies.
The new study by researchers at NewYork-Presbyterian Hospital/Weill Cornell Medical Center, published in the Journal of Urology, shows that PSA can be a much more effective marker for prostate cancer when an additional drug therapy is used than it can as a stand-alone test, which is how it is currently used by physicians.
"At a time when the value of PSA is being increasingly debated, we have shown that when used in a specific way, it can be of great value in identifying men with previously undetected prostate cancer," says the study’s lead investigator, Dr. Steven A. Kaplan, the E. Darracott Vaughan Jr., Professor of Urology at Weill Cornell Medical College and director of the Iris Cantor Men's Health Center at NewYork-Presbyterian/Weill Cornell.
"We have shown that using PSA with these drugs can help us differentiate prostate cancer from benign prostate disease in patients who are difficult to diagnose," says Dr. Kaplan, who is also chief of the Institute for Bladder and Prostate Health at NewYork-Presbyterian/Weill Cornell. "It also demonstrates a better way to use both the PSA test and these powerful drugs."
Dr. Kaplan created the combination screening method as a way to understand cancer risk in men who have consistently abnormal PSA readings despite one or more negative biopsies. This patient population offers physicians a "diagnostic dilemma" he says — "despite the fact that biopsies are becoming more and more effective at detecting cancer in the prostate, a significant number of patients with prostate cancer continue to have negative biopsies." He adds that the PSA (prostate specific antigen) test alone is not a good indicator of prostate cancer. "It measures multiple factors associated with prostate disease, including enlargement of the prostate and inflammation."
The research team decided to see what would happen to PSA levels after the use of two 5-alpha-reductase inhibitor drugs — finasteride and dutasteride — designed to reduce the size of an enlarged prostate. The theory is that these drugs might improve the usefulness of PSA in diagnosing prostate cancer. If the PSA remains persistently high even though the prostate has shrunk, or PSA rises after having reached its lowest level, it could indicate the presence of cancer. And when the gland is smaller, a biopsy can be more effective, according to researchers.
The study was conducted in two phases. It enrolled 276 men at NewYork-Presbyterian/Weill Cornell whose PSA was greater than 4, who had a normal digital rectal examination and two or more negative biopsies.
In the first phase, 97 patients, who were given 5 milligrams of finasteride or 0.5 milligrams of dutasteride daily, had their PSA measured at 6 and 12 months, a transrectal ultrasonography and a biopsy performed at 1 year. Study results show that a year of the drug therapy reduced PSA in all the men — an average of 48 percent — but the magnitude of reduction was significantly greater in men with benign prostate disease and significantly less in 28 percent of the patients whose prostate biopsy detected cancer.
In the second phase of the study, 179 patients received the same drug therapy but underwent a biopsy only if their PSA showed a change of 0.4 ng/ml. In all, 42 men (27 percent) had the biopsy, and 26 of those participants (54 percent) had cancer. Within that group, 77 percent of the patients had high-grade tumors.
Researchers successfully identified cancer cases in men who participated in the second phase study with the combined drug therapy and evaluation of PSA trends, by sending those with minimal changes for a biopsy. This meant that men who didn’t need a biopsy did not have one – unlike all the men in phase one.
"Our study shows these drugs may be most helpful in helping us diagnose undetectable prostate cancer," Dr. Kaplan says.
Co-authors include senior investigator Dr. E. Darracott Vaughan, Dr. Richard K. Lee, Dr. Doreen E. Chung, Dr. Alexis E. Te, Dr. Douglas S. Scherr, and Dr. Ashutosh Tewari at Weill Cornell.
NewYork-Presbyterian Hospital/Weill Cornell Medical Center
NewYork-Presbyterian Hospital/Weill Cornell Medical Center, located in New York City, is one of the leading academic medical centers in the world, comprising the teaching hospital NewYork-Presbyterian and Weill Cornell Medical College, the medical school of Cornell University. NewYork-Presbyterian/Weill Cornell provides state-of-the-art inpatient, ambulatory and preventive care in all areas of medicine, and is committed to excellence in patient care, education, research and community service. Weill Cornell physician-scientists have been responsible for many medical advances — including the development of the Pap test for cervical cancer; the synthesis of penicillin; the first successful embryo-biopsy pregnancy and birth in the U.S.; the first clinical trial for gene therapy for Parkinson’s disease; the first indication of bone marrow’s critical role in tumor growth; and, most recently, the world’s first successful use of deep brain stimulation to treat a minimally conscious brain-injured patient. NewYork-Presbyterian Hospital also comprises NewYork-Presbyterian Hospital/Columbia University Medical Center, NewYork-Presbyterian/Morgan Stanley Children’s Hospital, NewYork-Presbyterian Hospital/Westchester Division and NewYork-Presbyterian/The Allen Hospital. NewYork-Presbyterian is the #1 hospital in the New York metropolitan area and is consistently ranked among the best academic medical institutions in the nation, according to U.S.News & World Report. Weill Cornell Medical College is the first U.S. medical college to offer a medical degree overseas and maintains a strong global presence in Austria, Brazil, Haiti, Tanzania, Turkey and Qatar. For more information, visit www.nyp.org and weill.cornell.edu.
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