A new prognostic test can help determine whether a prostate cancer patient will go on to have a recurrence of the disease, even if surrounding lymph nodes initially appear negative for cancer, according to a study by University of Southern California researchers.
The test, developed at USC, "appears to be a very powerful test and better than anything else we know of for predicting recurrence," says Richard Cote, professor of pathology and urology at the Keck School of Medicine of USC. Current trials are also using the test to find hidden metastases in lymph nodes and bone marrow for breast and lung cancers.
The study, "Detection of Occult Lymph Node Metastases in Patients with Local Advanced (pT3) Node-Negative Prostate Cancer" appears this week in the Journal of Clinical Oncology.
Prostate cancer is the most common non-skin cancer in America, according to the Prostate Cancer Foundation. One in six American men will be diagnosed with prostate cancer, making men 35 percent more likely to be diagnosed with prostate cancer than women are to be diagnosed with breast cancer.
"Thanks to greater awareness, as well as increased and improved screening, we see men increasingly diagnosed with prostate cancer in its early stages," Cote says. "Most of these patients will do very well and will not require treatment beyond surgery or radiation therapy to cure their disease."
But a proportion of these patients have metastases of the prostate cancer appear later, even when the lymph nodes removed at the time of the cancer surgery appeared negative for cancer, he says.
Cote and his colleagues looked at 3,914 lymph nodes from 180 patients who were staged as having lymph nodes negative for cancer based on standardized histologic evaluation (visual scan under a microscope). The lymph nodes were then evaluated for occult (hidden) metastases using new specific immunohistochemistry tests that can detect cancer on a cell-by-cell level.
Their new analysis checks for cells that react with antibodies to cytokeratins and PSA. The team's testing found occult tumor cells in the lymph nodes of 24 of the patients whose lymph nodes had been previously been diagnosed as cancer-free.
The test used to detect the occult tumor cells is more sensitive than any clinical, pathologic or radiographic techniques, Cote says.
The group then compared cancer recurrence and survival in those patients with the hidden tumor cells versus those without the cells. The presence of occult tumor cells was associated with increased prostate cancer recurrence and decreased survival. In fact, "the outcome for patients with occult tumor cells was similar to those who were identified as having positive lymph nodes at the time of the surgery," Cote says.
"We have shown that occult tumor spread in lymph nodes is a significant predictor of disease recurrence," he says. "Once surgery is performed, the primary form of treatment is adjuvant systemic therapy. In patients with no evidence of metastasis, success of such therapy is assumed to be due to killing of occult tumor before it becomes clinically evident. Therefore, the ability to detect occult metastasis is pivotal to identification of patients who would most benefit from systemic therapy and also identify patients who may be spared from unnecessary therapy."
Jon Weiner | EurekAlert!
3D images of cancer cells in the body: Medical physicists from Halle present new method
16.05.2018 | Martin-Luther-Universität Halle-Wittenberg
Better equipped in the fight against lung cancer
16.05.2018 | Friedrich-Alexander-Universität Erlangen-Nürnberg
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
18.05.2018 | Power and Electrical Engineering
18.05.2018 | Information Technology
18.05.2018 | Information Technology