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New PET Imaging Tracer Makes Tumors Visible in High Resolution

By MedImaging International staff writers
Posted on 31 Jul 2013
Image: Postdoc Thomas Betzel preparing the synthesis of the newly developed folic acid PET tracer for use on cancer patients (Photo courtesy of Gloria Pla, ETH Zurich).
Image: Postdoc Thomas Betzel preparing the synthesis of the newly developed folic acid PET tracer for use on cancer patients (Photo courtesy of Gloria Pla, ETH Zurich).
An international team of scientists has developed a new compound that enables specific tumor types to be rendered visible in high resolution using positron emission tomography (PET) imaging.

The tracer has effectively been evaluated in laboratory mice. The researchers are now planning clinical trials in humans.

Imaging techniques used for cancer detection and tracking provide a lot more than only data on the scale and location of cancerous ulcers. There are advanced techniques that additionally characterize the tumor cells precisely, for instance, by specific molecules they carry on their surface. Such additional information provides clinicians with vital clues as to the exact sort of cancer and enables them to predict the probability that a patient will respond to a particular form of therapy.

Researchers from ETH Zurich (Switzerland), the Paul Scherrer Institute (PSI; Villigen PSI, Switzerland), and Merck Millipore (Billerica, MA, USA) have now developed a new tracer for PET that binds to the folic acid receptor. This receptor is significant because it accumulates on the cell surface in many cancer types. The PET scan provides data on the size and location of the tumor and the density of the folic acid receptors on the cell surface.

The researchers, headed by Drs. Simon Ametamey and Roger Schibli, both professors at the Institute of Pharmaceutical Sciences at ETH Zurich, have successfully assessed their new substance in mice with cervical tumors. In a next phase, the scientists now want to study whether the substance proves equally successful in humans. A pilot study on patients with ovarian, lung and intestinal cancer in several Swiss hospitals, including University Hospital Zurich, is in preparation. It will be the first clinical trial on a folic acid receptor marker for PET on patients.

If the substance proves suitable, the scientists would like to use it to predict the effectiveness of chemotherapy in the future. They, most importantly, have a new generation of cancer medication in mind that also binds to the folic acid receptor, which then channels the drug into the cancer cells, where it unfolds its therapeutic effect.

“Our PET tracer provides important additional information for this targeted therapeutic approach with cytotoxic substances,” stated Dr. Ametamey. One difficulty with the new form of therapy is that not in all patients the cancer cells carry the folic acid receptor. In the instance of cervical, ovarian, and brain tumors, it is nine out of 10 patients, with lung cancer 75% and with breast cancer about 50%. In patients without the receptor, the novel chemotherapy is ineffective.

With the aid of the new technique, it could be possible to predict whether a patient will respond to such treatment. Patients whose tumors do not have any folic acid receptors could avoid this therapy and its side effects. Moreover, physicians can use the new PET tracer to optimize monitoring the progress of the therapy and study whether the tumor is shrinking.

However, the new PET tracer is not just interesting for cancer medicine, but also suitable for displaying inflammatory responses in the body. The folic acid receptor occurs also at the surface of specific cells of the immune system, the macrophages, and only if these are in a so-called activated state during an inflammatory response. The new marker substance could therefore be used to display inflammatory diseases such as arthritis, arteriosclerosis, or inflammatory bowel diseases with PET.

Moreover, a third arena of application is also imaginable for the substance: medication development. “If we’ve got a method to detect chronic inflammatory responses in a noninvasive way, we can test the efficacy of anti-inflammatory medication more effectively,” explained Dr. Schibli.

The study’s findings were published February 10, 2013, in the journal Bioconjugate Chemistry.

Related Links:

ETH Zurich
Paul Scherrer Institute
Merck Millipore


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88 (43.153762817383): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294747531 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (46.014785766602): 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 (797.03330993652): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (!!!!! 1554.9659729004): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (232.93495178223): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (938.89236450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (!!!!! 1368.0458068848): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 1461.9827270508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
105 (!!!!! 7419.1093444824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
106 (!!!!! 1389.0266418457): 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=294747531 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (629.18663024902): 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=294747531 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 1138.2102966309): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
109 (211.95411682129): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
110 (292.06275939941): 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=294747531 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (885.009765625): 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=294747531 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1194.0002441406): 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 (691.89071655273): 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 (594.13909912109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
115 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
116 (684.02290344238): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
117 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
118 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
119 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
120 (526.90505981445): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
121 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
122 (478.02925109863): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 67562.103271484): 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 (!!!!! 1291.9902801514): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294747531 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294747531 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 34489.154815674): ( 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 (!!!!! 2286.9110107422): ( 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 (114.91775512695): 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 (47.206878662109): 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 (67.949295043945): 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 (46.014785766602): 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 (499.96376037598): 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 (58.889389038086): 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 (61.03515625): 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 (51.021575927734): 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 (!!!!! 1969.8143005371): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (483.98971557617): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (272.98927307129): SELECT name FROM jos_deeppockets WHERE id=213
138 (41.007995605469): SELECT name FROM jos_deeppockets WHERE id=213
139 (622.03407287598): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (509.97734069824): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))213((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
142 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
143 (!!!!! 19981.861114502): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 4512.0716094971): 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=294747531 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (89.883804321289): 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=294747531 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1002.0732879639): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (!!!!! 4081.0108184814): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 4200.9353637695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
149 (244.140625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
150 (!!!!! 3185.0337982178): 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 (!!!!! 5227.80418396): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
152 (99.18212890625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
153 (!!!!! 1117.9447174072): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294747531 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294747531 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (347.13745117188): 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)
155 (50.067901611328): 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)
156 (217.19932556152): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (638.00811767578): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
158 (353.81317138672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294747531 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294747531 AND published='1' LIMIT 1
159 (75.101852416992): select jos_twitters.link from jos_twitters where cat=10
160 (43.153762817383): select jos_facebook.link from jos_facebook where cat=10
161 (44.107437133789): select jos_google_plus.link from jos_google_plus where cat=10
162 (41.007995605469): select jos_linkedin.link from jos_linkedin where cat=10