Table 1. Demographic and clinical details of patients with tumors reclassified according to the IASLC/ATS/ERS classification by the study pathologists (reproduced with permission from the Editor).

Characteristic	Total (N=575) [%]	Observation (surgery alone; n=293) [%]	ACT (n=282) [%]	P*
Sex				0.18
Male	365 [63]	179 [61]	186 [66]
Female	210 [37]	114 [39]	96 [34]
Age, years				0.56
<55	200 [35]	101 [34]	99 [35]
55-64	216 [38]	119 [41]	97 [34]
≥65	159 [28]	73 [25]	86 [31]
Stage				0.87
I	310 [54]	152 [52]	158 [56]
II	179 [31]	95 [32]	84 [30]
III	86 [15]	46 [16]	40 [14]
N stage				0.78
N0	325 [57]	162 [55]	163 [58]
N1	174 [30]	89 [30]	85 [30]
N2	76 [13]	42 [14]	34 [12]
T stage				0.52
1	88 [15]	42 [14]	46 [16]
2	446 [78]	230 [79]	216 [77]
3 to 4	41 [7]	21 [7]	20 [7]
Type of surgery				0.08
Pneum	99 [17]	43 [15]	56 [20]
Other	476 [83]	250 [85]	226 [80]
WHO PS				0.84
0	327 [57]	162 [55]	165 [59]
1 to 2	248 [43]	131 [45]	117 [41]
Adenocarcinoma subtype				0.21
Lepidic	23 [4]	13 [4]	10 [4]
Acinar	148 [26]	74 [25]	74 [26]
Papillary	99 [17]	42 [14]	57 [20]
Micropapillary	39 [7]	25 [9]	14 [5]
Solid	266 [46]	139 [47]	127 [45]

*, χ² test was calculated from logistic regression model stratified by trial. ACT, adjuvant chemotherapy; ATS, American Thoracic Society; ERS, European Respiratory Society; IASLC, International Association for the Study of Lung Cancer; Pneum, pneumonectomy; PS, performance status.