Table 2

Univariable analysis of factors associated with recurrence at first surveillance colonoscopy (SC1)

No recurrenceRecurrencep Value
Age, years (median, SD)68.0 (11.0)69.0 (10.6)0.79
Sex
 Male348 (82.7%)73 (17.3%)0.305
 Female320 (85.3%)55 (14.7%)
Previous attempt at EMR (n, %)
 Yes79 (76.7%)24 (23.3%)0.032
 No590 (85.0%)104 (15.0%)
Lesion size (n, %)
 20 mm152 (95.0%)8 (5.0%)<0.001
 21–30 mm230 (89.5%)27 (10.5%)
 31–40 mm154 (84.6%)28 (15.4%)
 >40 mm132 (67.0%)65 (33.0%)
Location (n, %)
 Rectum <5 cm from dentate line31 (70.5%)13 (29.5%)0.044
 Rectum >5 cm from dentate line90 (76.9%)27 (23.1%)
 Sigmoid67 (85.9%)11 (14.1%)
 Descending colon23 (82.1%)5 (17.9%)
 Splenic flexure13 (81.3%)3 (18.8%)
 Distal transverse22 (91.7%)2 (8.3%)
 Mid transverse30 (88.2%)4 (11.8%)
 Proximal transverse27 (90.0%)3 (10.0%)
 Hepatic flexure58 (90.6%)6 (9.4%)
 Ascending colon157 (86.7%)24 (13.3%)
 Caecum128 (86.5%)20 (13.5%)
 Caecum ICV involved18 (72.0%)7 (28.0%)
 Caecum appendiceal orifice involved6 (66.7%)3 (33.3%)
Location group (n, %)
 Distal colon211 (79.0%)56 (21.0%)0.007
 Proximal colon (splenic flexure or above)459 (86.4%)72 (13.6%)
Paris classification (n, %)
 0-IIa338 (91.4%)32 (8.6%)<0.001
 0-Is160 (78.4%)44 (21.6%)
 0-IIa+ls127 (73.4%)46 (26.6%)
 Other42 (89.4%)5 (10.6%)
Morphology (n, %)
 Granular446 (81.2%)103 (18.8%)0.004
 Non-granular143 (91.1%)14 (8.9%)
 Mixed42 (82.4%)9 (17.6%)
 Unable to classify32 (97.0%)1 (3.0%)
Kudo classification (n, %)
 Kudo I & II78 (98.7%)1 (1.3%)<0.001
 Kudo III264 (84.9%)47 (15.1%)
 Kudo IV296 (79.1%)78 (20.9%)
 Kudo V13 (92.9%)1 (7.1%)
Fellow involved (n, %)
 Yes247 (88.2%)33 (11.8%)0.015
 No420 (81.6%)95 (18.4%)
Intraprocedural bleeding (n, %)
 No615 (85.5%)104 (14.5%)<0.001
 Yes55 (69.6%)24 (30.4%)
Adrenaline in submucosal injectate (n, %)
 No129 (75.0%)43 (25.0%)<0.001
 Yes540 (86.4%)85 (13.6%)
Lifting (n, %)
 Lifts well625 (84.7%)113 (15.3%)0.029
 Lifts poorly42 (73.7%)15 (26.3%)
Current type (n, %)
 Non-microprocessor controlled80 (74.1%)28 (25.9%)0.003
 Microprocessor controlled588 (85.5%)100 (14.5%)
En bloc resection (n, %)
 No532 (81.2%)123 (18.8%)<0.001
 Yes138 (97.2%)4 (2.8%)
Additional modality (n, %)
 None513 (87.5%)73 (12.5%)<0.001
 APC40 (55.6%)32 (44.4%)
 Other117 (83.6%)23 (16.4%)
APC use (n, %)
 No630 (86.8%)96 (13.2%)<0.001
 Yes40 (55.6%)32 (44.4%)
Submucosal fibrosis (n, %)
 Yes555 (85.3%)96 (14.7%)0.030
 No113 (77.9%)32 (22.1%)
Majority polyp histology (n, %)
 Tubular adenoma179 (87.7%)25 (12.3%)0.016
 Tubulovillous adenoma371 (80.8%)88 (19.2%)
 Villous adenoma15 (68.2%)7 (31.8%)
 Sessile serrated adenoma/polyp89 (92.7%)7 (7.3%)
 Traditional serrated adenoma9 (90.0%)1 (10.0%)
 Other (ie, invasive cancer and underlying polyp histology not reported, lipoma)6 (100.0%)0 (0.0%)
Dysplasia (n, %)
 None64 (94.1%)4 (5.9%)0.001
 Low grade463 (85.1%)81 (14.9%)
 High grade140 (76.5%)43 (23.5%)
EMR duration (min) median (SD)15.0 min (17.0)30.0 min (24.6)<0.001
  • APC, argon plasma coagulation; EMR, endoscopic mucosal resection.