Prognostic factors in patients with bone metastasis of lung cancer after immune checkpoint inhibitors: A retrospective study

Table 1 Clinical characteristics of patients

Characteristic	Number
Age at bone metastasis	Median 70 (range: 42–87)
Sex
Male	29
Female	16
Histological type
Adenocarcinoma	37
Squamous	3
NOS	5
Bone metastases
Multiple	45
Single	0
Brain metastases
Yes	8
No	37
Adrenal metastasis
Yes	4
No	41
ECOG PS
1	29
2	13
3	3
4	0
Treatment before bone metastasis diagnosis
Yes	19
No	26
Chemotherapy before bone metastasis diagnosis
Yes	21
No	24
ICI use after bone metastasis diagnosis
Yes	28
No	17
Tumor proportion score
≥ 50%	15
< 50%	20
Not tested	10

ECOG PS: Eastern Cooperative Oncology Group performance status; NOS: Not otherwise specified; ICI: Immune checkpoint inhibitor.