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C. Galeone
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P1.06 - Poster Session/ Screening and Early Detection (ID 218)
- Event: WCLC 2015
- Type: Poster
- Track: Screening and Early Detection
- Presentations: 1
- Moderators:
- Coordinates: 9/07/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P1.06-017 - Small Cell Lung Cancer in Lung Cancer Screening: Frequency and Outcome (ID 2476)
09:30 - 09:30 | Author(s): C. Galeone
- Abstract
Background:
Only 30% of small cell lung cancers (SCLC) are diagnosed as limited stage (LS-SCLC), whereas the majority of cases show extensive stage disease (ES-SCLC). Specific frequency and outcome of SCLC within lung cancer screening trials have not been described. The purpose of this study was to describe the frequency and outcome of SCLC in lung cancer screening trials with annual or biennial LDCT controls.
Methods:
The population was selected from two lung cancer screening trials (one pilot study and one randomized controlled study) based on serial low-dose computed tomography (LDCT). Subjects with diagnosis of SCLC were selected and the stage of the disease was assessed at the time of diagnosis, as follows: a) TNM staging system; b) 2-stage staging system (e.g. LS-SCLC or ES-SCLC). Survival curves were estimated using Kaplan-Meier method and were compared by log-rank test.
Results:
5,134 subjects were recruited and, thereafter, followed up for a median time of 8.3 years, with 45,141 person-year of clinical follow up. Ten SCLC were reported with incidence of SCLC 22/100,000 person-year, notably, 8 in the LDCT arms with incidence of 24/100,000. SCLC was diagnosed in 3/1643 women and 7/3385 men, age at diagnosis 65 years (range 53-73), and cumulative tobacco consumption of 82 pack-years (range 30-113). The proportion of SCLC among all lung cancers diagnosed in the screening was 10/164. Six out of the 8 SCLC reported in LDCT arms were screen-detected, whereas 2 SCLC were non-screen-detected. Median standard uptake value (SUV) by [18]F-Fluorodeoxyglucose Positron Emission Tomography was 10 (range 5.5-14.4). According to TNM classification, all but 1 SCLC were advanced stage at the time of diagnosis, whereas according to the 2-stage system 5 LS-SCLC and 5 ES-SCLC were observed. The prevalence of LS-SCLC was 62.5% in LDCT arm, in particular, 66.7% among screen-detected and 50% non-screen-detected. The 2 SCLC reported in control group were both ES-SCLC. Six of the 10 subjects died from SCLC, with median overall survival of 21.2 months (95% CI 7.4 – nc months; Figure). Median overall survival was 12-month longer for LS-SCLC (p = 0.02). Survival at 5 years was 0%. Figure 1.
Conclusion:
SCLC was diagnosed with higher proportion of LS-SCLC in LDCT-based screening trials, as compared to data from the literature. Median overall survival of LS-SCLC was slightly longer than ES-SCLC, allegedly related to diagnosis anticipation. None of these patients was alive at 5 years.
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PLEN 04 - Presidential Symposium Including Top 4 Abstracts (ID 86)
- Event: WCLC 2015
- Type: Plenary
- Track: Plenary
- Presentations: 1
- Moderators:T. Mok, F.R. Hirsch
- Coordinates: 9/09/2015, 10:45 - 12:15, Plenary Hall (Bellco Theatre)
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PLEN04.07 - Stopping Smoking Reduces Mortality in Low-Dose Computed Tomography (LDCT) Screening Volunteers (ID 2458)
11:51 - 12:03 | Author(s): C. Galeone
- Abstract
- Presentation
Background:
The National Lung Screening Trial (NLST) has achieved a 7% reduction in mortality from any cause with low-dose computed tomography (LDCT) screening, as compared with the chest radiography arm. Other randomized trials are under way, comparing LDCT screening with no intervention in heavy smokers populations. None of these studies is designed to investigate the impact of smoking habits on screening outcome. In the present study, we have tested the effect of stopping smoking on the overall mortality of volunteers undergoing LDCT screening.
Methods:
Between 2000 and 2010, 3381 heavy smokers aged more than 50 years were enrolled in two LDCT screening programmes. Sixty-nine percent were males with median age of 58 years and median smoking exposure of 40 pack-years. Based on the last follow-up information, subjects were divided in two groups: current smokers throughout the screening period, and former smokers. The latter group included ex-smokers at the time of baseline screening (early quitters), and those who stopped smoking during the screening period (late quitters).The effect of smoking on mortality was adjusted according to the following covariates: gender, age, body-mass index (BMI), lung function (FEV1 %) and pack years at baseline.
Results:
With a median follow-up time of 9.7 years, and a total of 32,857 person/years (P/Y) follow-up, a total of 151 deaths were observed in the group of 1797 current smokers (17,846 P/Y) and 109 in 1584 former smokers (15,011 P/Y). As compared to current smokers, the Relative Risk (RR) of death of former smokers was 0.77 (95% CI, 0.60 to 0.99, p = 0.0416), corresponding to a 23% reduction of total mortality. Excluding 239 subjects who had stopped smoking from less than 2 years from the end-point of follow-up, RR was 0.64 (95% CI, 0.48 to 0.84, p = 0.0016), with a 36% mortality reduction. A similar risk reduction was observed in the subset of 476 late quitters (27 deaths, 4,777 P/Y), with a RR of 0.60 (95% CI, 0.40 to 0.91, p = 0.0158).
Conclusion:
Stopping smoking is associated with a significant reduction of the overall mortality of heavy smokers enrolled in LDCT screening programs. The benefit of stopping smoking appears to be 3 to 5-fold greater than the one achieved by earlier detection in the NLST trial.
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