Table 2.

 Neoplastic lesions in patients with hyperplastic polyps

Patient characteristic	Patients with adenomas N (%)	Patients with carcinomas N (%)
No of patients with neoplastic lesions	122	26
Mean (SD) no of adenomas/patient	3.2 (3)	N/A
No of patients with only tubular adenomas	70 (57%)	N/A
No of patients with at least one tubulovillous or villous lesion	52 (43%)	N/A
No of patients with at least one lesion with K-ras mutation	42 (34%)	8 of 23 (35%)
No of patients with K-ras mutation in both neoplastic lesion and HP	3 (2%)	0
No of patients with at least one neoplastic lesion with APC LOH	42 of 112 (38%)	3 of 21 (14.3%)

*APC, adenomatous polyposis coli gene; HP, hyperplastic polyp; LOH, loss of heterozygosity.