TY - JOUR T1 - Final screening round of the NELSON lung cancer screening trial: the effect of a 2.5-year screening interval JF - Thorax JO - Thorax SP - 48 LP - 56 DO - 10.1136/thoraxjnl-2016-208655 VL - 72 IS - 1 AU - Uraujh Yousaf-Khan AU - Carlijn van der Aalst AU - Pim A de Jong AU - Marjolein Heuvelmans AU - Ernst Scholten AU - Jan-Willem Lammers AU - Peter van Ooijen AU - Kristiaan Nackaerts AU - Carla Weenink AU - Harry Groen AU - Rozemarijn Vliegenthart AU - Kevin ten Haaf AU - Matthijs Oudkerk AU - Harry de Koning Y1 - 2017/01/01 UR - http://thorax.bmj.com/content/72/1/48.abstract N2 - Background In the USA annual lung cancer screening is recommended. However, the optimal screening strategy (eg, screening interval, screening rounds) is unknown. This study provides results of the fourth screening round after a 2.5-year interval in the Dutch-Belgian Lung Cancer Screening trial (NELSON).Methods Europe's largest, sufficiently powered randomised lung cancer screening trial was designed to determine whether low-dose CT screening reduces lung cancer mortality by ≥25% compared with no screening after 10 years of follow-up. The screening arm (n=7915) received screening at baseline, after 1 year, 2 years and 2.5 years. Performance of the NELSON screening strategy in the final fourth round was evaluated. Comparisons were made between lung cancers detected in the first three rounds, in the final round and during the 2.5-year interval.Results In round 4, 46 cancers were screen-detected and there were 28 interval cancers between the third and fourth screenings. Compared with the second round screening (1-year interval), in round 4 a higher proportion of stage IIIb/IV cancers (17.3% vs 6.8%, p=0.02) and higher proportions of squamous-cell, bronchoalveolar and small-cell carcinomas (p=0.001) were detected. Compared with a 2-year interval, the 2.5-year interval showed a higher non-significant stage distribution (stage IIIb/IV 17.3% vs 5.2%, p=0.10). Additionally, more interval cancers manifested in the 2.5-year interval than in the intervals of previous rounds (28 vs 5 and 28 vs 19).Conclusions A 2.5-year interval reduced the effect of screening: the interval cancer rate was higher compared with the 1-year and 2-year intervals, and proportion of advanced disease stage in the final round was higher compared with the previous rounds.Trial registration number ISRCTN63545820. ER -