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Low-Dose CT Offers Cost-Effective Lung Screening

By MedImaging International staff writers
Posted on 25 Nov 2014
A new statistical analysis of from a US lung screening trial concluded that performing low-dose computed tomography (CT) screening can be cost-effective compared to doing no screening for lung cancer in aging smokers.

“This provides evidence, given the assumptions we used, that it is cost-effective,” said Ilana Gareen, assistant professor (research) of epidemiology in Brown University’s School of Public Health (Providence, RI, USA) and second author on the new study published in the New England Journal of Medicine. Four years ago, the massive US National Lung Screening Trial (NLST) revealed that low-dose helical CT scanning slashed mortality rates from lung cancer by 20% compared to chest X-rays. The study involved more than 53,000 smokers aged 55–74. Chest X-rays, meanwhile, have been shown to be no better than doing nothing to screen for the cancer.

With the NLST’s abundance of medical and cost data to work from, a research team including Gareen, senior author Constantine Gatsonis, professor of biostatistics, and lead author Dr. William Black at Dartmouth College’s Geisel School of Medicine (Hanover, NH, USA), set out to determine the financial implications of conducting CT screening compared to not screening. The standard for this is to calculate a ratio of the costs of CT screening per person—including the test, any follow-up testing and treatment, and indirect costs—and the number of quality-adjusted life-years (QALY) added per person across the population.

The resulting ratio was USD 81,000 per quality year added. A standard accepted value is that any sum below USD 100,000 is cost-effective. The researchers concluded that, “whether screening outside the trial will be cost-effective will depend on how screening is implemented.” This is because, like all cost-effectiveness analyses, the derivation of the USD 81,000 ratio involved many assumptions. When the researchers varied their assumptions or conducted analyses of cost-effectiveness in some subgroups of patients, they found that the resulting ratios greatly differed: sometimes improving but sometimes reducing the cost-effectiveness.

In the main analysis researchers assumed that there was no life-prolonging medical benefit to CT screening other than detecting lung cancer. However, when they factored in a different assumption that other serious problems would be detected and treated (as happened during the NLST), then the ratio fell to USD 54,000 per quality-adjusted life-year added. The investigators also saw the ratio become more favorable when they assumed that some diagnoses of lung cancer assumed to be “excess” (diagnoses beyond the rate that is expected in the population) were cancers that would have impacted participant life expectancy, as opposed to being benign forms of lung cancer.

However, other changes in suppositions brought the ratio above or near the USD 100,000 cutoff. Examples included adding in the future health costs for survivors, assuming higher costs than in the study for screening, follow-up, or treatment, or more pessimistic assumptions about survival or quality of life. When the cost for the test reached USD 500 (compared to the USD 285 it cost in the NLST), then cost-effectiveness eroded.

Another variable factor was the number of CT scans that would be required to follow-up a positive screening test. An earlier study examining CT lung screening cost-effectiveness assumed four. “There are additional questions that still need to be investigated,” Prof. Gareen said, “issues such as how often patients need to be screened, what’s the optimal interval, whether screen results should impact future screening frequency, i.e., should you wait two years to screen again after a patient has a negative screening exam?”

Among patient subgroups, CT screening was more cost-effective in women than in men and more economic among higher-risk patients than among lower-risk ones, the analysis revealed. Ultimately, the study suggests that healthcare providers will have a substantial impact on whether CT screening proves cost-effective in the complex health care marketplace. “We estimate that screening with low-dose CT for lung cancer as performed in the NLST costs less than USD 100,000 per QALY gained,” the authors concluded. “The determination of whether screening performed outside the trial will be cost-effective will depend on exactly how screening is implemented.”

That matters, according to Prof. Gareen, because while CT scanning has a demonstrated medical benefit, paying for it means potentially not paying for something else. “Cost is becoming more and more important, and if you fund one thing, there are other things you won't be able to fund,” she said.

Related Links:

US National Lung Screening Trial
Brown University
Dartmouth College’s Geisel School of Medicine


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85 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
89 (75.817108154297): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755869 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (41.961669921875): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755869 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
91 (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`
92 (79.870223999023): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (44.822692871094): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (106.0962677002): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
107 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
108 (66.995620727539): 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=294755869 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (54.121017456055): 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=294755869 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
110 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
111 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
112 (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.id=294755869 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (648.02169799805): 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=294755869 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
114 (607.96737670898): 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 (510.93101501465): 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 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
117 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
118 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
119 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
120 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
121 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
122 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
123 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
124 (315.90461730957): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 25192.975997925): 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 (800.13275146484): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755869 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755869 AND type='deeppockets_item' AND published='1' LIMIT 1
127 (109.91096496582): ( 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 (61.03515625): ( 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 (82.015991210938): 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 (52.928924560547): 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 (85.830688476562): 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 (53.167343139648): 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 (48.87580871582): 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 (48.87580871582): 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 (72.002410888672): 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 (46.968460083008): 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 (537.87231445312): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (432.01446533203): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (41.007995605469): SELECT name FROM jos_deeppockets WHERE id=211
140 (29.802322387695): SELECT name FROM jos_deeppockets WHERE id=211
141 (780.10559082031): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (768.89991760254): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (94.890594482422): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
144 (64.849853515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
145 (!!!!! 11274.099349976): TRUNCATE TABLE jos_trademed_module
146 (144.00482177734): 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=294755869 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (98.228454589844): 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=294755869 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (679.01611328125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (97.036361694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (126.12342834473): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
151 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
152 (!!!!! 1668.9300537109): 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 (148.05793762207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
154 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
155 (90.122222900391): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755869 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755869 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (44.822692871094): 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 (41.007995605469): 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 (38.862228393555): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (524.99771118164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
160 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755869 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755869 AND published='1' LIMIT 1
161 (72.002410888672): select jos_twitters.link from jos_twitters where cat=10
162 (40.054321289062): select jos_facebook.link from jos_facebook where cat=10
163 (44.107437133789): select jos_google_plus.link from jos_google_plus where cat=10
164 (32.901763916016): select jos_linkedin.link from jos_linkedin where cat=10