Featured Research

from universities, journals, and other organizations

PSMA-based imaging traces even treatment-resistant prostate cancer

Date:
June 9, 2014
Source:
Society of Nuclear Medicine
Summary:
Anti-androgen hormonal therapy, also called chemical castration, can be an important defense against further disease progression for patients with prostate cancer that has traveled and grown in other areas, or metastasized -- but some cases simply do not respond to this treatment. A groundbreaking molecular imaging agent has been developed to help clinicians find as much cancer as possible, whether it is responding favorably or not, in an effort to improve clinical decision making for these patients.

Anti-androgen hormonal therapy, also called chemical castration, can be an important defense against further disease progression for patients with prostate cancer that has traveled and grown in other areas, or metastasized -- but some cases simply do not respond to this treatment. A groundbreaking molecular imaging agent has been developed to help clinicians find as much cancer as possible, whether it is responding favorably or not, in an effort to improve clinical decision making for these patients, say researchers at the Society of Nuclear Medicine and Molecular Imaging's 2014 Annual Meeting.

The imaging technique championed by this study is called F-18 DCFBC PET/CT, developed at Johns Hopkins University in Baltimore, Md., by study co-author Martin G. Pomper, MD, PhD. F-18 DCFBC is a unique small-molecule PET agent that searches for and attaches to prostate-specific membrane antigen (PSMA), which signals more strongly from malignant prostate cells than from normal cells. The study further proves the effectiveness of the imaging agent by providing substantial clinical data for both castration-sensitive and castration-resistant prostate cancer patients.

"Currently there is a great unmet need in prostate cancer management and drug development for a functional imaging agent that is able to detect prostate cancer and monitor response to therapy," said Steve Cho, MD, PhD, assistant professor of nuclear medicine and PET in the department of radiology at Johns Hopkins University School of Medicine. "Unfortunately, a truly reliable functional imaging agent for prostate cancer does not exist, but several exciting metastatic cancer imaging agents have been in development over the last several years. We are working toward improvements beyond the current capabilities of conventional bone and CT imaging, and a small-molecule PSMA-based PET radiopharmaceutical such as F-18 DCFBC is one such possibility."

The agent is injected prior to PET imaging, and the particles emitted by the radiolabel, fluorine-18, are then detected by a specialized scanner performing both positron emission tomography and computer tomography (PET/CT). This hybrid imaging system uses both functional and structural data to create a composite image of anatomy and physiology with "hot spots" where the imaging agent is binding to PSMA targets in the body, otherwise known as tumor uptake.

This study includes the first 12 patients from an ongoing trial, including five cases of castration-sensitive and seven cases of castration-resistant cancer, both with rising PSMA levels and evidence of metastases. Hot spots representing tumor uptake were correlated with serum prostate-specific antigen and folate levels as well as castration-resistant status. Results of the study showed F-18 DCFBC uptake was comparable to conventional imaging in relation to the lymph nodes, some bone and viscera, including the adrenal glands and pancreas. Lower DCFBC uptake was seen in highly scarred bone metastases when compared to other kinds of growths, but DCFBC PET was found to be more sensitive than conventional imaging for detecting bone metastases, especially within the cervical spine and areas showing degenerative changes, as well as in subcentimeter-sized lymph nodes. Additionally, a higher uptake of the agent was observed in castration-resistant bone metastases, and a direct link was found between PSMA levels and tumor-agent uptake. Further studies are required to get a comprehensive picture of the value of F-18 DCFBC PET for this patient population.

Aside from skin cancer, prostate cancer is the most prevalent form of cancer among men in the United States, according to 2014 statistics from the American Cancer Society. About 233,000 new cases of prostate cancer are expected to be diagnosed and about 29,480 prostate-cancer related deaths are estimated this year.


Story Source:

The above story is based on materials provided by Society of Nuclear Medicine. Note: Materials may be edited for content and length.


Cite This Page:

Society of Nuclear Medicine. "PSMA-based imaging traces even treatment-resistant prostate cancer." ScienceDaily. ScienceDaily, 9 June 2014. <www.sciencedaily.com/releases/2014/06/140609140857.htm>.
Society of Nuclear Medicine. (2014, June 9). PSMA-based imaging traces even treatment-resistant prostate cancer. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2014/06/140609140857.htm
Society of Nuclear Medicine. "PSMA-based imaging traces even treatment-resistant prostate cancer." ScienceDaily. www.sciencedaily.com/releases/2014/06/140609140857.htm (accessed July 30, 2014).

Share This




More Health & Medicine News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Health Insurers' Profits Slide

Health Insurers' Profits Slide

Reuters - Business Video Online (July 30, 2014) Obamacare-related costs were said to be behind the profit plunge at Wellpoint and Humana, but Wellpoint sees the new exchanges boosting its earnings for the full year. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins