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Radiotherapy for Brain Cancer May Be Improved by Blocking DNA Repair Processes

By MedImaging International staff writers
Posted on 30 Apr 2014
Researchers have demonstrated in both cancer cell lines and mice that shutting down critical DNA repair processes could enhance the effectiveness of radiation therapy for highly fatal brain tumors called glioblastomas.

Radiation therapy causes double-strand breaks in DNA that must be fixed for tumors to keep growing. Scientists have long theorized that if they could find a way to block repairs from being made, they could prevent tumors from growing or at least slow down the growth, thereby extending patients' survival. Blocking DNA repair is a particularly attractive strategy for treating glioblastomas, as these tumors are highly resistant to radiation therapy. In a new study, University of Texas (UT) Southwestern Medical Center (Dallas, USA) researchers demonstrated that the hypothesis actually works in the context of glioblastomas.

“This work is informative because the findings show that blocking the repair of DNA double-strand breaks could be a viable option for improving radiation therapy of glioblastomas,” said Dr. Sandeep Burma, associate professor of radiation oncology in the division of molecular radiation biology at UT Southwestern.

Dr. Burma researches the determination of basic mechanisms by which DNA breaks are repaired, with the translational objective of improving cancer therapy with DNA-damaging agents. Recent research from his lab has demonstrated how a cell makes the choice between two major pathways that are used to repair DNA breaks—non-homologous end joining (NHEJ) and homologous recombination (HR). His lab found that enzymes involved in cell division called cyclin-dependent kinases (CDKs) activate HR by phosphorylating a key protein, EXO1. In this manner, the use of HR is coupled to the cell division cycle, and this has important implications for cancer therapeutics. These findings were published April 7, 2014, in the journal Nature Communications.

Whereas this study describes how the cell chooses between NHEJ and HR, a translational study from the Burma lab demonstrates how blocking both repair pathways can improve radiotherapy of glioblastomas. Researchers in the lab first were able to show in glioblastoma cell lines that a drug called NVP-BEZ235, which is in clinical trials for other solid tumors, can also suppress two key DNA repair enzymes, DNA-PKcs and ATM, which are crucial for NHEJ and HR, respectively. While the drug by itself had limited effect, when combined with radiation therapy, the tumor cells could not quickly repair their DNA, stalling their growth.

Although enthusiastic by the early findings in cell lines, the scientists remained guarded because earlier efforts to identify DNA repair inhibitors were not successful when used in living models—mice with glioblastomas. Drugs developed to treat brain tumors also must cross what's known as the blood-brain-barrier in living models.

However, the NVP-BEZ235 drug could effectively cross the blood-brain barrier, and when given to mice with glioblastomas and combined with radiation, the tumor growth in mice was inhibited and the mice survived a lot longer, up to 60 days compared to approximately 10 days with the drug or radiation therapy alone. These findings were published in a recent issue of Clinical Cancer Research.

“The consequence is striking,” said Dr. Burma. “If you irradiate the tumors, nothing much happens because they grow right through radiation. Give the drug alone, and again, nothing much happens. But when you give the two together, tumor growth is delayed significantly. The drug has a very striking synergistic effect when given with radiation.”

The combination effect is significant because the conventional therapy for glioblastomas in humans is radiation therapy; therefore, finding a drug that enhances the effectiveness of radiation therapy could have profound clinical importance eventually. For example, such drugs may permit lower doses of X-rays and gamma rays to be used for traditional therapies, thereby causing fewer side effects. “Radiation is still the mainstay of therapy, so we have to have something that will work with the mainstay of therapy,” Dr. Burma said.

Whereas the findings provide evidence that the theory of “radiosensitizing” glioblastomas works in mouse models, additional research and clinical trials will be needed to show whether the combination of radiation with DNA repair inhibitors would be effective in humans, Dr. Burma cautioned. “Double-strand DNA breaks are a double-edged sword,” he said. “On one hand, they cause cancer. On the other, we use ionizing radiation and chemotherapy to cause double-strand breaks to treat the disease.”

“Heavy particles cause dense tracks of damage, which are very hard to repair,” Dr. Burma noted. “With gamma or X-rays, which are used in medical therapy, the damage is diffuse and is repaired within a day. If you examine a mouse brain irradiated with heavy particles, the damage is repaired slowly and can last for months.”

These findings, published March 17, 2014, in the journal Oncogene, suggest that glioblastoma risk from heavier particles is much higher compared to that from gamma or X-rays. This study is relevant to the medical field, since ionizing radiation, even low doses from computed tomography (CT) scans, have been reported to increase the risk of brain tumors, according to Dr. Burma.

Related Links:

University of Texas Southwestern Medical Center


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82 (416.04042053223): SELECT show_live FROM jos_com_show_setting LIMIT 1
83 (235.08071899414): SELECT show_live FROM jos_com_show_setting LIMIT 1
84 (285.86387634277): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (216.96090698242): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (97.036361694336): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (!!!!! 3432.9891204834): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294752183 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (80.108642578125): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294752183 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (45.061111450195): 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 (51.021575927734): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (29.087066650391): 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 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 4346.1322784424): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
105 (126.83868408203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
106 (65.088272094727): 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=294752183 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (50.067901611328): 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=294752183 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (84.877014160156): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
109 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
110 (51.021575927734): 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=294752183 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (446.79641723633): 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=294752183 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (576.01928710938): 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 (382.90023803711): 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 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
115 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
116 (49.829483032227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
117 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
118 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
119 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
120 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
121 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
122 (277.99606323242): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 36123.037338257): 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 (608.92105102539): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294752183 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294752183 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (76.055526733398): ( 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 (44.107437133789): ( 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 (51.021575927734): 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 (37.193298339844): 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 (56.028366088867): 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 (35.04753112793): 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 (34.093856811523): 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 (33.855438232422): 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 (40.054321289062): 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 (34.093856811523): 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 (785.11238098145): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (599.14588928223): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (43.153762817383): SELECT name FROM jos_deeppockets WHERE id=211
138 (30.994415283203): SELECT name FROM jos_deeppockets WHERE id=211
139 (597.95379638672): 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 '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (443.93539428711): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
142 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
143 (!!!!! 13449.907302856): TRUNCATE TABLE jos_trademed_module
144 (106.0962677002): 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=294752183 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (60.081481933594): 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=294752183 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (703.09638977051): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
149 (45.7763671875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
150 (!!!!! 1142.0249938965): 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 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
152 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
153 (38.862228393555): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294752183 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294752183 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (32.901763916016): 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=211 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=211 or channel_id is null)
156 (35.04753112793): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (173.09188842773): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
158 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294752183 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294752183 AND published='1' LIMIT 1
159 (39.100646972656): select jos_twitters.link from jos_twitters where cat=10
160 (31.948089599609): select jos_facebook.link from jos_facebook where cat=10
161 (31.948089599609): select jos_google_plus.link from jos_google_plus where cat=10
162 (31.948089599609): select jos_linkedin.link from jos_linkedin where cat=10