Table 1.

Clinical information of the patients included in the study.

Patient ID	Tissue	Age	Sex	Treatment	AJCC Clinical	Bowel preparation	Antibiotic prophylaxis	Tumor size (cm)	Ulcer	Stenosis grade
101	Colon	64	M	None	IIIb	Yes	Cefazolin 2 g + Metronidazole 500 mg	7.5 × 6 × 2	No	2
115	Colon	64	M	None	IIIb	No	Cefazolin 2 g + Metronidazole 500 mg	4, 8	Ulcer	Non-stenotic
116	Colon	73	F	None	IIIb	Yes	Cefazolin 2 g + Metronidazole 500 mg	2.2 × 2 × 1.3	No	Non-stenotic
118	Colon	87	M	None	IVa	No	Cefuroxim 3 g	6.5 × 5 × 3.5	Ulcer	Stenotic; whole circumferential growth
119	Colon	34	F	None	IIIc	No	Cefuroxim 3 g + Metronidazole 500 mg	2, 5	No	Stenotic
131	Colon	46	M	None	IVa	Yes	Cefazolin 2 g + Metronidazole 500 mg	6	No	Obstructive growth
221	Colon	80	F	None	IIa	Yes	Cefazolin 2 g + Metronidazole 500 mg	8 × 5.5	Central ulcer	Stenotic
224	Colon	84	M	None	IIIb	Yes	Cefazolin 2 g + Metronidazole 500 mg	3.9 × 3.5 × 1.9	No	Stenotic, no passage with instrument
225	Colon	84	F	None	IIa	Yes	Cefazolin 2 g + Metronidazole 500 mg	3.5	No	2/3 Stenotic circumferential
227	Colon	74	F	None	I	Yes	Cefazolin 2 g + Metronidazole 500 mg	3 × 2.2 × 2	No	Stenotic
204	Rectum	62	M	50.4 Gy; Capecitabine	IV	Yes	Cefazolin 2 g + Metronidazole 500 mg	4.2 × 3.5 × 1.6	Ulcer	Narrow
209	Rectum	86	M	None	IIIa	Yes	Cefazolin 2 g + Metronidazole 500 mg	2.2 × 2 × 0.5	Ulcer	1/8 of circumferential
103	Rectum	67	F	43.2 Gy; Capecitabine + Regorafenib	IIIb	Yes	Cefazolin 2 g + Metronidazole 500 mg	1 × 1 × 0.2	Yes (tumor heavy shrink)	1
107	Rectum	79	M	None	IIIb	Yes	Cefazolin 2 g + Metronidazole 500 mg	0.4 × 0.2 × 0.2	No	1/4 of circumferential
130	Rectum	81	F	None	IIIb	Yes	Cefazolin 2 g + Metronidazole 500 mg	3.5 × 3 × 0.5	No	Stenotic, no passage with instrument
135	Rectum	50	M	50.4 Gy; Capecitabine	I	Yes	Cefazolin 2 g + Metronidazole 500 mg	0.3 × 0.3 × 0.4	Ulcer	Half of circumferential