Postoperative radiotherapy with or without concurrent chemotherapy for oral squamous cell carcinoma in patients with three or more minor risk factors: a propensity score matching analysis

Table 1 Characteristics of all patients

Characteristic	Frequency in the CCRT group (%)	Frequency in the RT group (%)	p-value (2-sided)
Sex
Male	28 (82.4%)	32 (94.1%)	0.259
Female	6 (17.6%)	2 (5.9%)
ECOG performance
0–1	33 (97.1%)	32 (94.1%)	1
2	1 (2.9%)	2 (5.9%)
Age
< 40 years	2 (5.9%)	1 (2.9%)	1
≧ 40 years	32 (94.1%)	33 (97.1%)
Other comorbidities
No	19 (55.9%)	26 (76.5%)	0.123
Yes	15 (44.1%)	8 (23.5%)
Smoking
Yes	27 (79.4%)	29 (85.3%)	0.752
No	7 (20.6%)	5 (24.6%)
Alcohol
Yes	25 (73.5%)	27 (79.4%)	0.776
No	9 (26.5%)	7 (20.6%)
Betel quid
Yes	21 (61.8%)	26 (76.5%)	0.294
No	13 (38.2%)	8 (23.5%)
Anemia
Yes	10 (29.4%)	10 (29.4%)	1.000
No	24 (70.6%)	24 (70.6%)
Site^a
Tongue	9 (26.5%)	7 (20.6%)	0.738
Mouth floor	1 (2.9%)	1 (2.9%)
Buccal mucosa	12 (35.3)	14 (41.2%)
Gums	8 (23.5%)	7 (20.6%)
Hard palate	1 (2.9%)	0
Retromolar trigone	3 (8.8)	5 (14.7%)
Differentiation
Other	30 (88.2%)	28 (82.4%)	0.734
Poor	4 (11.8%)	6 (17.6%)
Pathologic T stage
T1–3	13 (38.2%)	12 (35.3%)	1
T4	21 (61.8%)	22 (64.7%)
Pathologic N stage
N0	16 (47.1%)	25 (73.5%)	0.046
N1	18 (52.9%)	9 (26.5%)
Margin distance
< 5 mm	19 (55.9%)	24 (70.6%)	0.314
≥ 5 mm	15 (44.1%)	10 (29.4%)
Skin invasion
Yes	6 (17.6%)	9 (26.5%)	0.56
No	28 (82.4%)	25 (73.5%)
Bone invasion
Yes	14 (41.2%)	16 (47.1%)	0.807
No	20 (58.8%)	18 (52.9%)
Perineural invasion
Yes	21 (61.8%)	22 (64.7%)	1
No	13 (38.2%)	12 (35.3%)
Vascular invasion
Yes	4 (11.8%)	1 (2.9%)	0.356
No	30 (88.2%)	33 (97.1%)
Lymphatic invasion
Yes	1 (2.9%)	1 (2.9%)	1
No	33 (97.1%)	33 (97.1%)
Invasion depth of tumor
< 10 mm	5 (24.6%)	2 (5.9%)	0.427
≥ 10	29 (75.4%)	32 (94.1%)

ISSN: 1748-717X