Prognosis of radiotherapy for esophageal cancer in elderly patients exceeding seventy-five years old

Table 1 Demographics and clinical characteristics of patients, n (%)

Variables	Number of patients
Age
≥ 75 and < 80	70 (50.4)
≥ 80	69 (49.6)
Sex
Female	39 (28.1)
Male	100 (72.9)
Marital status
Married	133 (95.7)
Unmarried	6 (4.3)
Smoke
No	84 (60.4)
Yes	55 (39.6)
Drink
No	102 (73.4)
Yes	37 (26.6)
C stage
I-II	24 (17.3)
III-IVa	93 (66.9)
IVb	22 (15.8)
T stage
T1-T2	22 (15.8)
T3-T4	117 (84.2)
N stage
Negative	22 (15.8)
Positive	117 (84.2)
M stage
M0	117 (84.2)
M1	22 (15.8)
Tumor length
< 6	90 (64.7)
≥ 6	49 (35.3)
Tumor location
Upper thoracic	34 (24.5)
Middle thoracic	62 (44.6)
Lower thoracic	43 (30.9)
ECOG
0-1	133 (95.7)
2	6 (4.3)
CCI
0	62 (44.6)
≥ 1	77 (55.4)
NRS2002
< 3	66 (47.5)
≥ 3	73 (52.5)
BMI
< 18.5	32 (23.0)
≥ 18.5	107 (77.0)
Weight loss
< 10%	128 (92.1)
≥ 10%	11 (7.9)
Radiation dose
< 60	57 (41.0)
≥ 60	82 (59.0)
Chemotherapy
No	36 (25.9)
Yes	103 (74.1)

BMI: Body mass index; ECOG: Eastern Cooperative Oncology Group; CCI: Charlson comorbidity index; NRS2002: Nutritional risk screening 2002.