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Oxygen in tumors predicts prostate cancer recurrence
Date:3/31/2012

TORONTO -- Low oxygen levels in tumors can be used to predict cancer recurrence in men with intermediate-risk prostate cancer even before they receive radiation therapy.

The clinical research, led by radiation oncologists at the Princess Margaret Hospital (PMH) Cancer Program, University Health Network (UHN) is published online today in Clinical Cancer Research, a journal of the American Association for Cancer Research (doi: 10.1158/1078-0432.CCR-11-2711).

"We've not only shown that men do worse if they have low oxygen levels (hypoxia) in their prostate cancer, but that they also do worse over a shorter period of time," says Dr. Michael Milosevic, radiation oncologist in the PMH Cancer Program, UHN. "These patients seem to develop cancer recurrence within only a few years of completing treatment."

"This information could change the way prostate cancer is treated and goes a long way to ensuring that all patients receive the right treatment from the outset based on their individual tumour," says Dr. Milosevic, who is also a professor of radiation oncology at the University of Toronto. "At the heart of it, this is what personalized medicine is all about."

Prostate cancer is commonly treated with surgery or radiation therapy, and yet cancer recurs or spreads in about 25% of treated men. The discovery of indicators, such as low oxygen in tumours, enables doctors to better select the most appropriate and effective treatments for each patient even before radiation therapy is delivered.

Dr. Milosevic and colleagues measured oxygen levels in 247 men with localized prostate cancer prior to radiation therapy and followed them for a median of 6.6 years. Low oxygen in the tumors predicted early relapse after radiation treatment. It was also the only identified factor that predicted local recurrence during follow-up.

"We believe that a tumour's genetic signature will be another promising predictor of recurren
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Contact: Geoff Koehler
geoff.koehler@uhn.ca
416-340-4011
University Health Network
Source:Eurekalert

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