AI Article Synopsis

  • The study focuses on improving the detection rates of circumferential margin involvement (CMI) in patients with middle and low rectal cancer.
  • The research involved 41 patients and used a combination of HE staining and immunohistochemistry, revealing a higher CMI detection rate (36.6%) when both methods were used together compared to either method alone.
  • Findings indicated that poorly differentiated tumors, tumors located less than 5 cm from the anal verge, and those with positive lymphatic metastasis had a significantly higher CMI rate, while CMI rates were not significantly influenced by factors like gender or age.

Article Abstract

Objective: To study the rule of circumferential margin involvement (CMI) in middle and low rectal cancer and improve its detection rate.

Methods: Pathological large slices stained by HE method was combined with immunohistochemistry to study the CMI of 41 patients with middle and low rectal cancer. There were 20 female and 21 male patients, with an average age of 59.5 years (range, 33 to 77 years).

Results: The positive rate of CMI by HE staining was 21.9%. The CMI positive rates of CK20, CDX2 and MMP7 by immunohistochemistry staining was 29.3%, 31.7% and 26.8%, respectively. The positive rate of CMI was 36.6% when combined both HE and immunohistochemistry test, which was significantly higher than those in single methods (all P < 0.05). The positive rate of CMI in poorly differentiated tumor was significantly higher than that in moderately and well-differentiated tumor. The positive rate of CMI in the tumors with a distance of less than 5 cm between the anal verge and the lower tumor margin was significantly higher than that in tumors with the above-mentioned distances of greater than or equal to 5 cm (P < 0.05). According to MMP7 detection, the positive rate of CMI in the group without lymphatic metastasis was significantly lower than that in N1 and N2 group (all P < 0.05). There was no significant correlation between CMI and gender, age, tumor infiltration, lymphatic metastasis, general pathological types and operation methods (P > 0.05).

Conclusions: The positive detection rate of CMI can be improved when combined large slices HE staining and immunohistochemistry. There is significant association between CMI and poorly differentiated tumor, lower location and positive lymphatic metastasis.

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