New Virus Linked to Cancer in Mice Found in Men with Prostate Cancer

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Feb. 24, 2006 - New findings on the detection and treatment of early and localized prostate cancer, which is expected to see 234,460 new cases in 2006, were discussed today at a press conference at the 2006 Prostate Cancer Symposium in San Francisco but the attention-grabber from the session was the announcement that a new virus has been found in humans that appears to be associated with prostate cancer. Most cases of prostate cancer are found in senior citizens about age 70.

When Houston restaurateur Tony Masraff was diagnosed with early-stage prostate cancer, his life was packed with dancing, running marathons, playing tennis, gardening, leading a successful business and spending time with his family.

But it wasn't until his doctor at The University of Texas M. D. Anderson Cancer Center advised "watchful waiting" as an option to invasive surgery and radiation that he realized he could continue his active life - free of treatment side effects, but with the cancer.

Masraff is one of about 200 men diagnosed with low-risk prostate cancer at M. D. Anderson on active surveillance for their disease, having changes monitored through regular Prostate Specific Antigen (PSA) tests, biopsies and check-ups. He also is one of hundreds of thousands of men nationwide who have had their prostate cancer detected by regular PSA tests at such an early stage that managing low-risk disease through surveillance outweighs the risks and possible side effects of treatments.

Now, a new study at M. D. Anderson will follow low-risk patients eligible for watchful waiting to determine if they can avoid or postpone therapy and related side effects, and still live as long as patients who immediately receive invasive therapy. The study will provide key information for the future development of clinical guidelines for watchful waiting.

"With the advent of the PSA test, we see prostate cancer detected much earlier but there is no evidence that early detection means longer survival. Because of the sensitivity of the test, clinically insignificant tumors sometimes are over-diagnosed and patients may, as a consequence, be over-treated with radiation and surgery," said Jeri Kim, M.D., principal investigator of the study and assistant professor in the Department of Genitourinary Medical Oncology at M. D. Anderson.

The study will enroll 650 prostate cancer patients who have been clinically defined either as low risk, or patients with localized prostate cancer who have refused early intervention, or patients with localized cancer who are precluded from therapy due to other serious health conditions. Patients who have had previous treatment for their prostate cancer are not eligible to participate.

Patients will have a biopsy at the beginning of the study to confirm the diagnosis of localized prostate cancer followed by PSA tests and digital rectal exams every six months. The need for additional biopsies will be determined at the end of the first year of surveillance, and participants on the study will be given a transrectal ultrasonography annually to detect any possible changes.

Patients also will be asked to complete a survey on their general health conditions as well as six other short surveys which will be used to monitor diet and behavior as part of related research.

Prostate cancer is one of only a few cancers that can be latent in the body for some time and not require immediate treatment," said Dr. Kim. "Many researchers have documented over the years that men die with their disease rather than from it, and while we need to intervene early, we also need to intervene appropriately with respect to the stage of disease, the man's age, his health in general and quality of life."

The most notable trend in prostate cancer treatment from 1986 to 1999, according to NCI, was the decreasing proportion of cases that received watchful waiting, surgical or chemical castration, or hormonal deprivation therapy as primary treatment. More aggressive treatments, including newer radiation techniques, were found to be on the rise. However, black men were found to receive substantially less aggressive treatment than white men.

Tony Masraff, now 68 years old, preaches "watchful waiting" to men diagnosed with early prostate cancer and has yet to regret not having a more invasive therapy to rid him of the cancer. He is diligent, however, in keeping his appointments and follow-up tests.

"I decided my quality of life was worth more than having a tumor taken out or radiated," said Masraff. "I don't worry about my prostate cancer. I really don't have time to worry about it."

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