Counting tumor cells in blood predicts treatment benefit in prostate cancer

Jul 06, 2008

Counting the number of tumor cells circulating in the bloodstream of patients with castration-resistant prostate cancer can accurately predict how well they are responding to treatment, new results show.

At the ESMO Conference Lugano (ECLU) organized by the European Society for Medical Oncology, researchers showed that changes in the number of circulating tumor cells predicted the outcome after chemotherapy in this hard to treat cancer.

"The results add to a growing body of evidence showing that counting these cells is a valuable method for predicting survival and for monitoring treatment benefit in these patients", said Dr. David Olmos from The Royal Marsden NHS Foundation Trust in the UK.

"Our study shows that circulating tumor cell counts could provide information about how patients are responding to therapy earlier than other markers such as prostate-specific antigen (PSA) or time-to-disease progression," he said. "We have observed that patients with declining numbers of circulating tumor cells can see a change in their initial prognosis, reflecting a potential benefit from therapy."

Among the 119 patients in the study, researchers found that those with the lowest circulating cell counts had on average the longest survival.

"Cancer cells can be detected in the circulating blood by a range of methods", Dr. Olmos said. "The technique we used in our study is classified as a cytometric approach. We use an antibody that is widely expressed by epithelial cancer cells, and then use a range of cell-staining techniques to ensure it is a cancer cell."

"Because these circulating cells have broken away from either primary tumors or metastatic sites in other parts of the body, they could potentially be used to help study the specific characteristics of the cancer and perhaps personalize therapy", Dr. Olmos said.

Source: European Society for Medical Oncology

Explore further: Anaesthesia: optimum ventilation strategy during general anaesthesia in abdominal operations found

add to favorites email to friend print save as pdf

Related Stories

Physicists discuss quantum pigeonhole principle

3 hours ago

The pigeonhole principle: "If you put three pigeons in two pigeonholes at least two of the pigeons end up in the same hole." So where's the argument? Physicists say there is an important argument. While the ...

Giant crater in Russia's far north sparks mystery

5 hours ago

A vast crater discovered in a remote region of Siberia known to locals as "the end of the world" is causing a sensation in Russia, with a group of scientists being sent to investigate.

NASA Mars spacecraft prepare for close comet flyby

6 hours ago

NASA is taking steps to protect its Mars orbiters, while preserving opportunities to gather valuable scientific data, as Comet C/2013 A1 Siding Spring heads toward a close flyby of Mars on Oct. 19.

Giant anteaters kill two hunters in Brazil

6 hours ago

Giant anteaters in Brazil have killed two hunters in separate incidents, raising concerns about the animals' loss of habitat and the growing risk of dangerous encounters with people, researchers said.

Recommended for you

Study shows epigenetic changes can drive cancer

6 hours ago

Cancer has long been thought to be primarily a genetic disease, but in recent decades scientists have come to believe that epigenetic changes – which don't change the DNA sequence but how it is 'read' – also play a role ...

Study recommends inmate immunity test

17 hours ago

(AP)—Federal experts are recommending that California test inmates for immunity to a sometimes fatal soil-borne fungus before incarcerating them at two Central Valley state prisons where the disease has killed nearly three ...

User comments : 2

Adjust slider to filter visible comments by rank

Display comments: newest first

CactusCritter
not rated yet Jul 06, 2008
The term "castration-resistant" tumors is used is this articles. Does it really mean that removal of the prostrate cannot cure the cancer?

Castration refers to testicle removal, so I find uae of the term somewhat unusual.
gdpawel
not rated yet Jul 07, 2008
It would be important to develop a method of in vivo labelling of tumor cells in the circulation and to monitor their trafficking and homing to other sites, such as the leptomeninges. If these cells are viable and therefore able to disseminate, I think the most robust test to this end is to document their ability to metastasize.

Tumor cell release in the circulation after cytotoxic chemotherapy is not new information, since it has been described about 15 years ago by E. Sphall in a paper published in Blood, where they measured tumor cell release in the circulation after stem cell mobilizing chemotherapy and G-CSF support.

What they found was strikingly important, as tumor cells mobilized from the bone marrow (if there was even minimal bone marrow infiltration) and the tumor (if their was residual disease in primary or metastases at the time of peripheral stem cell mobilization) had a temporarily different appearance in the peripheral blood, essentially yielding two distinct peaks; an early one mobilizing with the CD34 PBPCs and the other released later, and thought to represent tumor-derived cells.

The outcome for metabolic responders and non-responders with circulating tumor cell (CTC) monitoring is basically what is going on with a functional profiling assay, showing what patients are benefiting from what drug agents before introducing them into the patient. Monitoring CTCs could be utilized for confirmation after the patient is administered assay-directed most beneficial therapeutic agents.