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X-Rays Tied to Increased Risk of Childhood Leukemia

By MedImaging International staff writers
Posted on 10 Feb 2011
Diagnostic X-rays may increase the risk of developing childhood leukemia, according to a new study.

Researchers from the University of California (UC), Berkeley's School of Public Health (USA) found that children with acute lymphoid leukemia (ALL) had almost twice the chance of having been exposed to three or more X-rays scans compared with children who did not have leukemia. For B-cell ALL, even one X-ray was enough to slightly increase the risk. The findings differed somewhat by the region of the body imaged, with a modest increase associated with chest radiographs.

The new findings, published in the October 2010 issue of the International Journal of Epidemiology, come from the Northern California Childhood Leukemia Study, a population-based case-control study that includes 35 counties in the northern and central regions of the state. Whereas the link between high doses of radiation and cancer is well known, significant debate still surrounds the health impacts from the low doses of radiation typical of traditional X-rays.

"The general clinical impression has been that the level of radiation a child would be exposed to today from a conventional X-ray would not confer an additional risk for cancer,” said Dr. Patricia Buffler, UC Berkeley professor of epidemiology and lead investigator of the Northern California Childhood Leukemia Study. "The results of our study were not what we expected.”

Almost all cases of childhood leukemia are acute, with 80 percent being acute lymphoid leukemia (ALL), characterized by the overproduction of abnormal B- or T-cell lymphocytes, and 20% being acute myeloid leukemia (AML), in which granulocytes are overproduced. The study included 827 children up to age 15 diagnosed with either ALL or AML. The children with leukemia were each compared with other children randomly selected from the California birth registry who were matched by factors such as age, gender, ethnicity, and maternal race.

Interviews were conducted with mothers within four months of the diagnosis of leukemia, and the mothers were asked to report on the number of radiographs received by the child at least 12 months or more before the leukemia diagnosis. Mothers were also asked about their exposures to X-rays during pregnancy and the year prior to pregnancy. The researchers noted that dental X-rays were not considered because they are so common and deliver such a low dose of radiation that exposure to those radiographs would not discriminate between individuals with high and low levels of radiation exposure.

The study's findings found an increased risk from X-rays for ALL, but not for AML or T-cell leukemia, and there was no association with age at first exposure. Moreover, there was no increased risk associated with prenatal exposure to X-rays or maternal X-rays occurring before pregnancy, although these exposures were uncommon in this study population.

Dr. Smith-Bindman is in the process of characterizing the ionizing radiation exposure to children from CT scans as part of a study funded by the National Cancer Institute. She noted that two-thirds of the imaging procedures children undergo are conventional X-rays, accounting for about 20% of their exposure to radiation from medical imaging. In contrast, CT scans comprise only 10% of the medical imaging tests children undergo, but they account for two-thirds of their ionizing radiation dose.

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University of California, Berkeley's School of Public Health



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90 (30.994415283203): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733343 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
91 (35.04753112793): 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`
92 (48.160552978516): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (!!!!! 3127.8133392334): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (87.976455688477): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (105.85784912109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
107 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
108 (61.988830566406): 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=294733343 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (51.975250244141): 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=294733343 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
110 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
111 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
112 (64.13459777832): 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=294733343 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (520.94459533691): 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=294733343 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
114 (629.90188598633): 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
115 (746.9654083252): 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
116 (!!!!! 3333.8069915771): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
117 (228.8818359375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
118 (182.15179443359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
119 (257.96890258789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
120 (117.06352233887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
121 (133.99124145508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
122 (144.95849609375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
123 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
124 (360.01205444336): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 60123.920440674): 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
126 (574.82719421387): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733343 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733343 AND type='deeppockets_item' AND published='1' LIMIT 1
127 (!!!!! 15826.940536499): ( 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
128 (66.995620727539): ( 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
129 (390.05279541016): 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
130 (46.968460083008): 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
131 (234.84230041504): 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
132 (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
133 (199.0795135498): 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
134 (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
135 (193.83430480957): 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
136 (33.855438232422): 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
137 (494.00329589844): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (350.9521484375): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (200.03318786621): SELECT name FROM jos_deeppockets WHERE id=211
140 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=211
141 (576.01928710938): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (447.03483581543): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (!!!!! 2035.8562469482): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
144 (74.148178100586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
145 (!!!!! 14655.113220215): TRUNCATE TABLE jos_trademed_module
146 (!!!!! 3783.9412689209): 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=294733343 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (826.12037658691): 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=294733343 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (399.11270141602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
151 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
152 (!!!!! 1247.1675872803): 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
153 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
154 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
155 (36.954879760742): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294733343 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294733343 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (36.001205444336): 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)
157 (30.994415283203): 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)
158 (67.949295043945): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
160 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294733343 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294733343 AND published='1' LIMIT 1
161 (77.009201049805): select jos_twitters.link from jos_twitters where cat=10
162 (40.054321289062): select jos_facebook.link from jos_facebook where cat=10
163 (38.862228393555): select jos_google_plus.link from jos_google_plus where cat=10
164 (38.14697265625): select jos_linkedin.link from jos_linkedin where cat=10
165 (397.92060852051): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
166 (!!!!! 1110.0769042969): insert into jos_banners_delta values (14615,'2025-08-20 10:35:52','216.73.216.0','view'),(14202,'2025-08-20 10:35:52','216.73.216.0','view'),(14203,'2025-08-20 10:35:52','216.73.216.0','view')