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. 2001 Jan;48(1):41–46. doi: 10.1136/gut.48.1.41

Colonic crypt cell proliferation state assessed by whole crypt microdissection in sporadic neoplasia and familial adenomatous polyposis

S Mills 1, J Mathers 1, P Chapman 1, J Burn 1, A Gunn 1
PMCID: PMC1728170  PMID: 11115821

Abstract

BACKGROUND—It has yet to be established whether proliferative activity in the macroscopically normal colonic mucosa is causally correlated with neoplastic risk. Measurement of proliferative activity in human subjects is of necessity usually undertaken using indirect methods with inherent limitations, and relatively little has been published on the effect of normal biological variables on such indices.
AIMS—To establish the validity of mitosis counts following whole crypt microdissection as an index of the crypt cell proliferative state (CCPS) and to examine the effect of normal biological variables (age, sex, and colonic site) and colonic neoplasia on the mitotic index in macroscopically normal human colon.
SUBJECTS—Mucosal samples were obtained at colectomy or colonoscopy from 107 individuals (24 controls, 23 sporadic adenoma patients, 31 sporadic carcinoma patients, and 29 patients with familial adenomatous polyposis (FAP)).
METHODS—Mucosal specimens were hydrated, hydrolysed, and small groups of crypts separated from the main specimen under a dissecting microscope. The total number of mitoses/crypt were counted by one observer for each of 10 complete crypts.
RESULTS—Validation work established that whole crypt mitoses counts were reliable and reproducible. There was no relation between age and mean mitoses/crypt (Pearson correlation coefficient −0.1). The CCPS count was higher for males than for females (difference in means 2.8 (95% confidence interval 0.80-4.66)) among controls but there was no gender difference in the three disease groups. For all disease groups and controls, the crypt mitotic count showed a significant linear increase (p=0.004) from the rectum to the caecum. Biopsies from within 5 cm of the macroscopic margin of a carcinoma (near) gave a mean mitosis count of 12.6 while those from more than 10 cm (far) were lower but not significantly so (p=0.12) with a count of 9.0. The mean mitoses/crypt were similar for the controls and adenomas (5.6 and 4.7, respectively) but greater for the cancers and especially for FAP (8.3 and 14.2, respectively). Statistical analysis confirmed that there were significant differences (p<0.05) between controls and all disease groups together, between sporadic disease and FAP, and between adenoma and carcinoma subjects at each of the four colonic sites. Post hoc comparison by t test showed significantly greater CCPS for FAP compared with controls (p<0.001) and for sporadic cancer versus controls (p=0.04).
CONCLUSIONS—Whole crypt microdissection and mitosis counting is a reliable, reproducible, and robust technique for assessing CCPS in the human colon. CCPS is unaffected by age but increases from the distal to the proximal colon. CCPS is increased if a sporadic cancer is present and markedly increased in FAP. However, the precise relation of an increased CCPS to the neoplastic process remains uncertain.


Keywords: colonic crypt; cell proliferation; familial adenomatous polyposis; colorectal cancer

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Figure 1  .

Figure 1  

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Repeated analysis of variance for differing numbers of crypts counted for seven control subjects.

Figure 2  .

Figure 2  

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Mean mitoses/crypt and variance components for three biopsies from each rectum of seven control subjects.

Figure 3  .

Figure 3  

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Mean mitoses per crypt of rectal biopsies by disease group with means (bar), 25-75% percentiles (boxes), and 95% confidence limits (whiskers). FAP, familial adenomatous polyposis.

Figure 4  .

Figure 4  

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Regression analyses for biopsies from controls for the four colonic sites (1, rectum; 2, sigmoid; 3, left colon; 4, right colon) with 95% confidence limits.

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