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New Metabolic PET Tracer Can Help Find Brain Tumors and Improve Cancer Therapy Outcomes

By MedImaging International staff writers
Posted on 04 Nov 2015
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Researchers at the Stanford School of Medicine (Stanford, MD, USA) have found a new way to visualize brain tumor tissue using Positron Emission Tomography (PET) imaging.

Cancer cells divide rapidly, and require large stores of molecular building block to divide and grow. The Stanford team used this property of cancer cells, and developed a molecular tracer to track the activity of a key regulatory protein called pyruvate kinase M2 (PKM2) that helps control the metabolism of tumor cells. The tracer enabled the researchers to track the precise location of cancer cells in the brain. According to the researchers, the tracer could also help provide feedback about how a tumor is responding to therapy.

Pyruvate kinase is a key regulator in the cellular process of metabolizing energy sources such as glucose. Cells can either convert energy into the co-enzyme Adenosine Triphosphate (ATP), or use the energy to generate amino acids and other cellular building blocks. When pyruvate kinase exists as a dimer, a complex of two pyruvate kinase molecules, it favors the accumulation of amino acids. When the protein exists as four molecules bound together the cell generates more ATP. Cancer cells have higher levels of the dimer, and DASA molecules bind to the dimer. The researchers labeled DASA-23 molecules with a radioactive carbon molecule, and used PET scans observed how the DASA-23 molecules found, and bound to human glioblastoma cells, implanted in the brains of mice. The technique was able to highlight the brain cancer cells clearly among the normal, non-cancerous cells. The researchers expect the new [11C]DASA-23 tracer to be approved by the US Food and Drug Administration (FDA) for use in humans by Fall 2016.

Sanjiv Sam Gambhir, MD, PhD, director Molecular Imaging at Stanford, senior author of the research, said, “Tumor cells do all kinds of things to survive and prosper in the body. One of the key things they modify is a master switch that controls cell metabolism and allows the cell to make more of the building blocks necessary for cell division. But until now we’ve had no way to assess the presence or activity levels of the PKM2 protein involved in that switch. This is the first time we can noninvasively interrogate the biochemistry of a tumor with respect to this master switch PKM2. If we treat a tumor with a drug, we now see whether the cancer cells’ metabolic properties are changing. So we could know very quickly, possibly within a few days, whether the therapeutic approach is working. This new molecule, or tracer, works particularly well in the brain because normal brain cells have very low levels of PKM2 dimers. It’s possible, though, that this tracer could also be used in cancers in other tissues like the prostate, or to even learn more about how normal tissues adjust their metabolism during development or in response to varied environmental conditions.”

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93 (594.13909912109): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 2296.9245910645): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (!!!!! 1141.0713195801): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (957.01217651367): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (!!!!! 1124.8588562012): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (766.99256896973): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (!!!!! 1059.0553283691): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (277.04238891602): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (322.10350036621): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (447.98851013184): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (708.10317993164): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 5908.0123901367): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
105 (653.02848815918): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
106 (278.94973754883): 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=294761178 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (690.93704223633): 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=294761178 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1344.2039489746): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
109 (242.94853210449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
110 (180.00602722168): 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=294761178 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (461.10153198242): 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=294761178 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (727.89192199707): 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 (663.04206848145): 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 (152.1110534668): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
115 (75.817108154297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
116 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
117 (49.829483032227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
118 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
119 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
120 (385.99967956543): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 78954.935073853): 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 (116.82510375977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
123 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
124 (521.89826965332): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294761178 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294761178 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 1074351.0723114): ( 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 (122.0703125): ( 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 (46.968460083008): 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 (29.087066650391): 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 (35.04753112793): 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 (27.894973754883): 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 (27.894973754883): 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 (26.941299438477): 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 (695.94383239746): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (312.08992004395): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (319.00405883789): SELECT name FROM jos_deeppockets WHERE id=213
136 (41.007995605469): SELECT name FROM jos_deeppockets WHERE id=213
137 (408.17260742188): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (337.83912658691): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (454.18739318848): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
140 (252.00843811035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
141 (!!!!! 16200.065612793): TRUNCATE TABLE jos_trademed_module
142 (568.86672973633): 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=294761178 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (765.08522033691): 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=294761178 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (911.95106506348): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
147 (112.05673217773): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
148 (!!!!! 1271.9631195068): 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 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
150 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
151 (38.862228393555): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294761178 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294761178 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (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)
153 (26.941299438477): 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 (35.04753112793): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
156 (265.12145996094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761178 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761178 AND published='1' LIMIT 1
157 (113.96408081055): select jos_twitters.link from jos_twitters where cat=10
158 (!!!!! 3428.9360046387): select jos_facebook.link from jos_facebook where cat=10
159 (60.081481933594): select jos_google_plus.link from jos_google_plus where cat=10
160 (36.001205444336): select jos_linkedin.link from jos_linkedin where cat=10
161 (702.85797119141): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1302.0038604736): insert into jos_banners_delta values (14615,'2025-05-01 20:12:59','18.218.146.21','view'),(14202,'2025-05-01 20:12:59','18.218.146.21','view'),(14203,'2025-05-01 20:12:59','18.218.146.21','view')