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NLST: CT detects twice as many lung cancers as X-ray at initial screening exam
Date:5/22/2013

invasive procedures [297 vs. 121, respectively], and more lung cancers seen in the LDCT arm than in the CXR arm during the first screening round of NLST [292 vs. 190, respectively]. Although these results were generally anticipated, a key reason to publish the data was to document the exact differences between the two arms. "Although we did see that CT resulted in referring more patients for additional testing, the question comes down to whether the 20 percent reduction in mortality is worth the additional morbidity introduced by screening high-risk patients," says Church. He notes that although there were more follow-up procedures in the LDCT versus the CXR arm, it was encouraging to confirm that the number of individuals who actually had a more invasive follow-up procedure was quite small.

Another encouraging result reported is the high rate of compliance in performing the LDCT examination as specified in the research protocol across the 33 imaging facilities that carried out the study. "The sites complied with the low-dose CT imaging protocol specifications in 98.5 percent of all studies performed, which is outstanding considering the many thousands of scans performed," states Denise R. Aberle, M.D., the national principal investigator for NLST ACRIN and site co-principal investigator for the UCLA NLST team. Aberle, a member of the UCLA Jonsson Comprehensive Cancer Center, professor of Radiology and Bioengineering and vice chair for Research in Radiology at UCLA, also emphasizes that the first-screen result strongly suggests that CT lung cancer screening programs with radiologists who possess similar expertise and interpret similar numbers of CT cases that are obtained on scanners of the same caliber or better as those required for the NLST are likely to have results similar to those reported in the paper.

"What we've learned from the analysis of the first-screen results provides clinicians additional facts to discuss with patients who share
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Contact: Shawn Farley
PR@acr.org
703-648-8936
American College of Radiology
Source:Eurekalert

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