Colorectal and interval cancers of the Colorectal Cancer Screening Program in the Basque Country (Spain)

Table 3 Characteristics of post colonoscopy colorectal cancers at the time of diagnosis

	n (%)
Interval CRC tumor site
Appendix and caecum	5 (27.8)
Ascending	0 (0)
Hepatic flexure	1 (5.6)
Transverse	1 (5.6)
Splenic flexure	0 (0)
Descending	2 (11.1)
Sigmoid	7 (38.8)
Rectum	2 (11.1)
Unknown	0 (0)
Polyp found on the Screening colonoscopy
Yes	10 (61.1)
No	8 (38.9)
Polyp frequency
Median (IQR)	2.0 (1.0-3.5)
Range	1-6
Previous resection in the same location
Yes	2 (11.0)
No	16 (89.0)
Report of incomplete Screening colonoscopy
Yes2	3 (16.7)
No	15 (83.3)
Polyp size on the Screening colonoscopy
≥ 10 mm
Yes	2 (11.1)
No	16 (88.9)
Polyp histology (n = 10)
Hyperplastic polyp	0 (0)
LRA	6 (60.0)
AA	4 (40.0)
Bowel preparation
Inadequate	2 (11.1)
Adequate1	12 (66.7)
Unknown	4 (22.2)
Diverticulosis
Yes	5 (27.8)
No	13 (72.2)

¹Boston scale ≥ 7;

²Complementary radiological test (Barium Enema or Computerized Tomography) was performed after colonoscopy. AA: Advanced adenoma; LRA: Low risk adenoma; CRC: Colorectal cancer; IQR: Interquartile range.