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MR Spectroscopy May Help Diagnose Aggressiveness of Prostate Cancer

By MedImaging International staff writers
Posted on 15 Feb 2010
Image: Light micrograph of a section through a prostate gland showing cancerous cells (photo courtesy Dr. E. Walker / SPL).
Image: Light micrograph of a section through a prostate gland showing cancerous cells (photo courtesy Dr. E. Walker / SPL).
Magnetic resonance spectroscopy (MRS), which analyzes the biochemistry instead of the structure of tissues, may soon be able both to pinpoint the precise location of prostate cancer and to determine the tumor's aggressiveness; data that could help guide treatment planning.

In the January 27, 2010, online issue of the journal Science Translational Medicine, Massachusetts General Hospital (MGH; Boston, MA, USA) researchers reported how spectroscopic analysis of the biochemical composition of prostate glands accurately identified the location of tissue confirmed to be malignant by conventional pathology.

"Collectively analyzing all the metabolites measurable with a 7-Tesla MR scanner maps out prostate cancer in a way that cannot be achieved by any other current radiological test or by analyzing changes in a single metabolite,” said Leo L. Cheng, Ph.D., of the MGH imaging and pathology departments, the study's senior author. "It detects tumors that cannot be found with other imaging approaches and may give us information that can help determine the best course of treatment.”

Prostate-specific antigen (PSA) screening indicates the potential presence of a tumor, but since benign prostate conditions also affect PSA levels, a surgical biopsy is necessary to detect cancer. Since a tumor may be confined to only a small portion of the prostate, without a way to identify the most suspicious regions, a biopsy sample can miss the malignant area. In 2005, Dr. Cheng and his colleagues found that information provided by MR spectroscopy could differentiate prostate cancer from benign tissue and was superior to conventional pathologic studies in determining a tumor's prognosis. That investigation analyzed tiny tissue samples with an advanced technique utilizing a powerful research magnet.

The current study, building on the 2005 study, utilized a clinical MR scanner to analyze whole prostate glands, an application that could be applied to patient care. Spectroscopic readings were taken across sections of five cancerous prostate glands that had been removed from patients. The scans measured proportions of metabolites--biochemicals produced by various metabolic processes--that had been associated with the presence of cancer using data from the 2005 study. After scanning was complete, the prostate glands were examined by standard histologic techniques, which determine the presence of tumor based on the tissue's appearance. The histologic analysis was performed in a manner that preserved the tumor's location within the prostate.

When the two analyses were compared, five out of seven prostate regions where histologically identified tumor was located also scored high on a spectroscopy-based "malignancy index” The two other tumor regions were near the outer edge of the prostates, where exposure to the air compromised the accuracy of MR spectroscopy findings. For those tumors that did match, higher malignancy index scores also corresponded with larger tumors. Moreover, while the malignancy index was most accurate in identifying stage II tumors--those confined to the prostate and large enough to be felt in a physical exam--its overall accuracy was more than 90%.

Dr. Cheng explained that a prostate tumor's complete metabolomic profile has the potential to give essential information on its biological status. "As we analyze more and more tumors with spectroscopy, we should be able to define profiles that reflect specific clinical and pathological states, achieving a true needle-free, MR biopsy,” he stated. "And once these spectra are measured, they can be recombined to provide profiles reflecting parameters from the tumor's location to, ultimately, its aggressiveness.”

Since the current study was conducted using a whole-body clinical MR scanner, it should be adaptable to scanning patients. Because it used the powerful 7-Tesla magnetic resonance equipment at the MGH's Martinos Center for Biomedical Imaging, Dr. Cheng plans to further evaluate the approach using 3-Tesla equipment, which is available at centers across the United States. He and his colleagues are also working on more powerful software to process the amount of data in a full metabolomic screen in real time. After additional studies confirm their current results, they hope to move into clinical trials within one year or two.

"As long as we can define appropriate metabolomic profiles, this concept could someday be used for any kind of tumor or medical condition,” added Dr. Cheng, an assistant professor of radiology (pathology) at Harvard Medical School (Boston, MA, USA). "Furthermore, this concept can be extended from mapping tissue metabolites to include other disease-sensitive parameters. Eventually we hope to move the field of radiology from analyzing images that show the effects of disease to producing images that reveal the disease process itself.”

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87 (46.968460083008): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727964 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (32.901763916016): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727964 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (36.001205444336): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (87.02278137207): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
105 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
106 (61.03515625): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294727964 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (48.160552978516): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294727964 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
109 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
110 (46.014785766602): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294727964 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (447.03483581543): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294727964 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (581.02607727051): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
113 (375.98609924316): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
114 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
115 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
116 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
117 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
118 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
119 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
120 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
121 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
122 (319.00405883789): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 18687.009811401): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
124 (495.91064453125): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727964 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727964 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 7194.995880127): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
126 (70.095062255859): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
127 (278.94973754883): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (41.007995605469): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (200.98686218262): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (110.14938354492): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (195.02639770508): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (32.901763916016): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (185.96649169922): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (32.901763916016): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (497.81799316406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (356.19735717773): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (201.94053649902): SELECT name FROM jos_deeppockets WHERE id=212
138 (31.948089599609): SELECT name FROM jos_deeppockets WHERE id=212
139 (550.98533630371): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (446.08116149902): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
142 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
143 (!!!!! 10164.976119995): TRUNCATE TABLE jos_trademed_module
144 (81.062316894531): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294727964 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (55.074691772461): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294727964 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (864.02893066406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
149 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
150 (!!!!! 1101.9706726074): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
151 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
152 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
153 (33.855438232422): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294727964 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294727964 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (57.93571472168): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
155 (31.948089599609): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=212 or channel_id is null)
156 (34.809112548828): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (119.92454528809): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
158 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294727964 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294727964 AND published='1' LIMIT 1
159 (92.983245849609): select jos_twitters.link from jos_twitters where cat=10
160 (26.941299438477): select jos_facebook.link from jos_facebook where cat=10
161 (26.941299438477): select jos_google_plus.link from jos_google_plus where cat=10
162 (26.941299438477): select jos_linkedin.link from jos_linkedin where cat=10
163 (236.03439331055): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (962.97264099121): insert into jos_banners_delta values (14615,'2025-06-28 12:50:29','216.73.216.249','view'),(14202,'2025-06-28 12:50:29','216.73.216.249','view'),(14203,'2025-06-28 12:50:29','216.73.216.249','view')