Table 1.

The basic characteristics of enrolled studies

author	year	region	N(M/F)	year	STAS(+/−)	subtype	stage	Lobectomy/sublobar Resection	NOS	CT-based features
Kadota et al. [4]	2015	Japan	411 (164/247)	68	155/256	ADC	I	291/120	7	part-solid nodule.
Shiono et al. [15]	2016	Japan	318 (149/169)	70	47/271	ADC	I	202/116	5	pure solid nodule.
Dai et al. [10]	2017	China	383 (178/205)	60	116/267	ADC	I	364/19	6	radiological tumor size>2 cm.
Masai et al. [16]	2017	Japan	508 (248/260)	66	76/432	ADC	I	0/508	7	part-solid nodule.
Toyokawa et al. [17]	2018	Japan	327 (153/174)	69	191/136	ADC	I-IV	235/84	7	radiological tumor size>2 cm,pure solid nodule,part-solid nodule.
de Margerie-Mellon et al. [18]	2018	USA	80 (27/53)	68	40/40	ADC	NA	NA	6	radiological tumor size>2 cm, part-solid nodule.
Kim et al. [19]	2018	Republic of Korea	276 (129/147)	59	92/184	ADC	I-III	226/50	6	pure solid nodule, part-solid nodule.
Toyokawa et al. [20]	2018	Japan	82 (40/42)	71	31/51	ADC	I	0/82	7	radiological tumor size>2.0 cm.