Table 1.

Characteristics of Patients with Rectal Cancer Who Underwent Preoperative CRT

Variables	Number (%)/Median (IQR)
Age	56.0 (50.0–66.0)
∆ CEA%	−35.8% (−69.5% to – 5.50%)
∆ CA199%	−3.39% (−35.21% to 19.12%)
STBC score
Score 0	99 (45.6%)
Score 1–2	118 (54.4%)
Gender
Male	137 (63.1%)
Female	80 (36.9%)
Pathologic status
Vascular invasion	13 (6.0%)
Lymphatic invasion	13 (6.0%)
Perineural invasion	38 (17.5%)
CRM invasion	6 (2.8%)
ypT staging
ypT0-2	108 (49.8%)
ypT3-4	109 (50.2%)
ypN staging
ypN negative	163 (75.1%)
ypN positive	54 (24.9%)
Follow-up period (months)	33 (23–49)
Numbers of patients lost to follow up	10 (4.6%)
Numbers of patients died during follow-up	30 (13.8%)
Numbers of patients developed recurrence during follow-up	45 (20.7%)

Abbreviations: yp, pathologic status after neoadjuvant chemoradiotherapy; ∆CEA %, (post-chemoradiotherapy CEA – pre-chemoradiotherapy CEA)/pre-chemoradiotherapy CEA*100%; ∆CA199 %, (post-chemoradiotherapy CA199 – pre-chemoradiotherapy CA199)/ pre-chemoradiotherapy CA199*100%.