Table 1. Patient and tumor characteristics.

Characteristic	No. [%]
No. of patients	25
Age, median (range)	78 [75–91]
≤80	15 [60]
>80	10 [40]
Sex
Male	20 [80]
Female	5 [20]
Reason for lack of biopsy
Age	6 [24]
Vascular disease	5 [20]
Vascular disease + COPD	3 [12]
More than three comorbidities	3 [12]
COPD	3 [12]
COPD + age	2 [8]
Vascular disease + age	2 [8]
Metabolic alterations	1 [4]
Performance status
1	20 [80]
2	5 [20]
T stage
T1a	8 [32]
T1b	17 [68]
Lesion volume median (cc)
Median (range)	16.0 (4.2–23.1)
≤10.0 mL	3 [12]
>10 mL	22 [88]
BED (Gy)
Median (range)	136 (83.0–150.0)
≤120 Gy	10 [40]
>120 Gy	15 [60]
Tumor location
Right upper lobe	9 [36]
Middle lobe	1 [4]
Right lower lobe	1 [4]
Left upper lobe	8 [32]
Left lower lobe	6 [24]
FDG-PET/CT
SUVmax median (range)	5.5 (3.1–13.2)
≤5.0	10 [40]
>5.0	15 [60]

BED, biological effective dose; COPD, chronic obstructive pulmonary disease; FDG-PET/CT, ¹⁸fluorine-fluorodeoxyglucose-positron emission tomography/computed tomography.