Predicting the survival of patients with bone metastases treated with radiation therapy: a validation study of the Katagiri scoring system

Table 2 Patient characteristics

Variable	Subgroups	Entire cohort		Validation cohort for the Katagiri’s scoring system
Variable	Subgroups	No. of Patients	%	No. of Patients	%
Gender	Men	372	60.4	225	63.2
Gender	Women	244	39.6	131	36.8
Age	≤ 64	332	53.9	174	48.9
Age	≥ 65	284	46.1	182	51.1
KPS	10–60	277	45	188	52.8
	70–80	192	31	100	28.1
	90–100	131	21	66	18.5
ECOG PS	0–2	377	61	201	56.5
ECOG PS	3–4	226	37	155	43.5
Primary lesion	Lung cancer	222	36	163	45.8
	Breast cancer	65	11	15	4.2
	Prostate cancer	35	6	16	4.5
	Others	294	48	162	45.5
Primary characteristics	Slow	114	19	44	12.4
	Moderate	75	12	44	12.4
	Rapid	427	69	268	75.3
Visceral metastases	No	98	15.9	42	11.8
	Nodular	403	65.4	248	69.7
	Disseminated	96	15.6	66	18.5
Laboratory data	Normal	35	5.7	32	9.0
	Abnormal	244	39.6	232	65.2
	Critical	93	15.1	92	25.8
Previous chemotherapy	No	236	38.3	146	41.0
Previous chemotherapy	Yes	369	59.9	210	59.0
Multiple bone metastases	No	169	27.4	86	24.2
Multiple bone metastases	Yes	437	70.9	270	75.8
Katagiri score	0–3			18	5.1
	4–6			133	37.4
	7–10			205	57.6

ISSN: 1748-717X