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MINI 12 - Biomarkers and Lung Nodule Management (ID 109)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Screening and Early Detection
- Presentations: 1
MINI12.11 - Screening for Lung Cancer with the Early CDT-Lung and Computed Tomography (ID 204)
16:45 - 18:15 | Author(s): M. Phillips
Early CDT-Lung, a serum based biomarker consisting of a panel of seven autoantibodies that develop in response to tumor associated antigens, has been shown to detect lung cancer in all stages of disease. We hypothesized that this biomarker when used in combination with a low-dose CT (LDCT) in screening of a high-risk population would increase the detection of early stage lung cancer.
A prospective study of 1,600 subjects at high risk for lung cancer was designed. Eligibility criteria included persons 50-75 years of age, current or former smokers of ≥ 20 pack years and < 10 years since quit smoking. Those with a history of lung cancer in first degree relative(s) and any history of smoking were included. Exclusion criteria ware any history of cancer within 10 years (except skin cancer), any use of oxygen, and life expectancy of < 5 years. A direct mail campaign was conducted with study announcements sent to the homes of potentially high-risk individuals, who then contacted us for consideration of participating in this screening study. Those fitting inclusion criteria received the Early CDT-Lung blood test and a LDCT. A nodule of ≥ 3mm was considered as a positive scan. The Early CDT-Lung test was considered positive if any one of the seven autoantibodies was positive. All participants are to have yearly telephone follow-up for two years.
From May 2012 through November 2014, 815 individuals were enrolled and 814 completed the initial blood and LDCT screening tests. The cohort median age was 59 years with 55% female and 45% male gender distribution. The mean smoking history was 44 pack-years. Fifty-four per cent were current smokers while 46% were former smokers. Forty-six per cent of the LDCTs were negative for any lung nodule while 38% were positive. Incidental non-lung cancer findings were identified in 15% of the study group. The Early CDT-Lung biomarker was positive in 60 (7%) of participants, 23 males and 37 females. In those with a positive LDCT (n=313), the biomarker was positive in 25 (8%). As of January 30, 2015, there have been six confirmed lung cancers: two limited stage small cell, two Stage IB adenocarcinoma (ACA), and two Stage IA (one ACA and one squamous cell). The Early CDT-Lung blood test was positive in two of the four Stage IA/B lung cancers and negative in the two small cell cancers.There are 35 Early CDT-Lung biomarker positive individuals whose LDCT had no nodule. These individuals are being followed with yearly LDCT for two years. The study is continuing to accrue with a goal of 1,600. (NCT01700257)
The Early CDT-Lung biomarker was positive in 7% of our high-risk population. The biomarker was positive in two of six lung cancers, specifically in two of four Stage I lung cancers. Accrual to the study and follow-up of 35 biomarker positive but LDCT negative participants continues.
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