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Pediatric PET Imaging of Pediatric Brain Tumors Gets a Boost with Easier-to-Manufacture Imaging Agent

By MedImaging International staff writers
Posted on 04 Jul 2013
A comparatively new tool in the fight against childhood brain cancer has been shown enhance conventional magnetic resonance imaging (MRI) technologyby providing information about tumor metabolism and the level of cancer in children diagnosed with glioma, a growth caused by the abnormal division of glial cells in the brain.

The study investigators presented their findings at the Society of Nuclear Medicine and Molecular Imaging’s 2013 60th annual meeting, held June 8–12, 2013, in Vancouver (BC, Canada). Brain cancer imaging is frequently conducted with traditional MRI scanning, but there are some restrictions to this imaging technique. This type of cancer accounts for approximately 80% of all invasive brain tumors and develops in the brain’s glial cells that protect and maintain a state of neural equilibrium.

Traditional MRI can, at times, over- or underestimate the extent of these tumors and the precise shape of their outlying margins. An application of molecular imaging called positron emission tomography (PET), which provides data about physiologic processes instead of structures of the brain, can be performed with a range of imaging agents that bind to specific cellular systems to image gliomas. Two of the main kinds of brain imaging agents used for this objective provide information about either glucose metabolism of cells or the cellular metabolism of amino acids, the essential components of proteins utilized by tissues, in particular, rapidly growing so-called neoplastic tumors.

Amino-acid PET imaging has been shown to be better for detection of neoplastic tissue and treatment monitoring in cases of brain cancer than glucose imaging. Typically, the brain requires more glucose than the body’s other tissues and organs, making brain scans “noisier” and less defined than other regions because of this increase in overall cellular metabolism, whereas areas of increased amino acid activity show up clearly on scans as a visual “hot spot.” This study focuses on a specific amino acid imaging agent, O-(2-[18F]-fluoroethyl)-L-tyrosine (F-18 FET), and its diagnostic value for imaging pediatric gliomas when traditional MRI cannot make out a well-defined image of disease.

“Cancer of the brain and spinal cord are common in children and young adults, and caring for this particular group can be challenging because choice of treatment depends on specific information about the tumor. Tumors in younger patients show a greater variety in both type and size, and in many cases the tumors are located near critical brain structures that prohibit surgical removal,” said Veronika Dunkl, MD, a research scientist at the Institute of Neuroscience and Medicine, Forschungszentrum Jülich (Jülich, Germany). “In patients with brain tumors, contrast-enhanced structural MRI is currently the diagnostic method of choice. However, in youths with newly diagnosed cerebral lesions thought to be brain tumors, MRI’s ability to identify neoplastic tissue or tumor progression and recurrence after treatment is limited. F-18 FET is complementary and can potentially improve diagnosis and treatment of pediatric brain tumors.”

Pediatric brain imaging with PET and F-18 FET can be used not only to evaluate extent of tumors but also to help clinicians prepare for biopsy, surgery, and radiation therapies and monitor response to therapy and recurrence of tumors after completion of a treatment cycle.

F-18 FET is also distinctive from other amino acid PET agents because the generation of the drug can be centrally located and distributed by a radiopharmacy, whereas other amino acid-based PET agents must be manufactured by an on-site cyclotron—a huge particle accelerator that barrages particles with a target used to radiolabel the agent’s molecular compound. For F-18 FET, the amino acid tyrosine allows brain cells to signal each other. The greater logistical simplicity of F-18 FET is due to its radioactive half-life of approximately 110 minutes, whereas many other isotopes have a half-life of just approximately 20 minutes and must be administered for patient imaging almost instantly.

For this study, 15 young patients suspected of glioma cerebral cancer via MRI screening underwent PET imaging with the guidance of F-18 FET. This molecular imaging technique was found to be highly effective, about 87%, for identifying and differentiating brain lesions in children and young adults. The method was able to target 11 out of 12 brain lesions accurately as tumors and two out of three as a nontumorous growth. Repeated PET imaging (17 scans) for seven more pediatric patients provided significant information about cancer progression or remission. F-18 FET imaging was able to detect residual tumor and tumor progression in five out of six scans, and in 11 scans in which the tumor had been destroyed, for a 94% rate of accuracy.

“Results of the present study may improve the clinical management of this vulnerable patient population significantly, especially when a decision for further treatment is difficult or impossible on the basis of conventional MRI alone,” said Dr. Dunkl.

The US National Cancer Institute (Rockville, MD, USA) estimates that brain cancers are among the most common cancers in child populations. Incidence of pediatric brain tumors is approximately 3.2 cases per 100,000 people.

Related Links:

Institute of Neuroscience and Medicine, Forschungszentrum Jülich


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85 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (84.877014160156): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294747094 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (44.107437133789): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294747094 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (34.809112548828): 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 (86.069107055664): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.226043701172): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (92.983245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
105 (79.870223999023): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
106 (97.036361694336): 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=294747094 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (105.85784912109): 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=294747094 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (87.02278137207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
109 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
110 (92.983245849609): 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=294747094 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (418.18618774414): 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=294747094 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (588.89389038086): 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 (438.92860412598): 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 (90.122222900391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
115 (69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
116 (114.91775512695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
117 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
118 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
119 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
120 (305.8910369873): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 56552.171707153): 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
122 (126.12342834473): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
123 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
124 (!!!!! 1830.1010131836): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294747094 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294747094 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 642946.00486755): ( 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 (223.15979003906): ( 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 (230.07392883301): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
128 (252.00843811035): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (239.84909057617): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
130 (204.08630371094): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (212.9077911377): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (196.93374633789): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (!!!!! 1569.9863433838): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (890.01655578613): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (42.915344238281): SELECT name FROM jos_deeppockets WHERE id=213
136 (30.040740966797): SELECT name FROM jos_deeppockets WHERE id=213
137 (545.02487182617): 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 '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (420.09353637695): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (270.12825012207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
140 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
141 (!!!!! 14307.022094727): TRUNCATE TABLE jos_trademed_module
142 (739.81285095215): 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=294747094 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (426.05400085449): 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=294747094 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (!!!!! 2246.1414337158): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (865.93627929688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (447.03483581543): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
147 (798.94065856934): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
148 (!!!!! 1457.9296112061): 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
149 (221.01402282715): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
150 (148.77319335938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
151 (58.174133300781): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294747094 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294747094 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (34.809112548828): 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=213 or channel_id is null)
153 (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=213 or channel_id is null)
154 (121.11663818359): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (!!!!! 3031.0153961182): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
156 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747094 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747094 AND published='1' LIMIT 1
157 (56.028366088867): select jos_twitters.link from jos_twitters where cat=10
158 (30.994415283203): select jos_facebook.link from jos_facebook where cat=10
159 (31.232833862305): select jos_google_plus.link from jos_google_plus where cat=10
160 (29.802322387695): select jos_linkedin.link from jos_linkedin where cat=10
161 (368.11828613281): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1769.0658569336): insert into jos_banners_delta values (14615,'2025-06-20 06:48:50','216.73.216.120','view'),(14202,'2025-06-20 06:48:50','216.73.216.120','view'),(14203,'2025-06-20 06:48:50','216.73.216.120','view')