Table 1.

Patient characteristics

Variables	Consecutive cases (16)	Second-primary lung neoplasm (10)
Gender
Male	12 (75.0%)	9 (90%)
Female	4 (25.0%)	1 (10%)
Mean age (years)	70	70.5
Previous surgery	11 (68.8%)	10 (100%)
Lobectomy	9 (56.3%)	8 (80%)
Pneumonectomy	2 (12.5%)	2 (20%)
Histology	18	12
Adenocarcinoma	7 (38.9%)	5 (41.7%)
Squamous cell	6 (33.3%)	2 (16.7%)
Not conclusive	3 (16.7%)	3 (25%)
Not performed	2 (11.1%)	2 (16.7%)
Stage
Ia	10 (62.5%)	7 (70%)
Ib	3 (18.8%)	1 (10%)
IIa,b	0	0
IIIa	3 (18.8%)	2 (20%)
Localization	18	12
Central	2 (11.1%)	1 (8.3%)
Peripheral	16 (88.9%)	11 (91.7%)
Multiple ipsilateral neoplasm	2 (12.5%)	2 (10%)
Malignancy presentation
Metachronous	5 (31.3%)	5 (50%)
Synchronous	2 (12.5%)	2 (20%)
Synchronous or metastasis of primary lung cancer	3 (18.8%)	3 (30%)
Primary	5 (31.3%)	0
Metastasis of primary lung cancer	1 (6.3%)	0
Oncological comorbidities	4 (25%)	2 (20%)
Previous radiation therapy and chemotherapy for primary lung neoplasm	3 (18.8%)	2 (20%)