The team looked at7,557 people at high risk for lung cancer because they were current and former smokers. All received multidetector (多层螺旋) CT scans that measured the size of any suspicious-looking modules.
Volunteers who had nodules over 9.7 mm in width, or had growth of 4.6 mm that grew fast enough to more than double in volume every 400 days, were sent for further testing. Of the 196 people who fell into that category, 70 were found to have lung cancer,10 additional cases were found years later.
But of the 7, 361 who tested negative during screening only 20 lung cancer cases later developed.
In a second round of screening done one year after the first, 1.8 percent were sent to the doctor because they had a nodule that was large or fast-growing. More than half turned out to have lung cancer.
The result means that if the screening test says you dont have lung cancer, you probably dont,the researcher said. The chances of finding lung cancer one and two years after a negative first-round test were l in l,000 and 3 in l,000 respectively, they concluded.
36. The new study indicates that in case of small or slow-growing lung nodules_________.
A. you cannot be too careful
B. cancer is just matter of time
C. a biopsy is unnecessary
D. more aggressive testing is a must
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