[Pathologic study of circumferential margin involvement in middle and lower rectal cancer]

Area of Science:

• Oncology
• Surgical Pathology
• Cancer Biomarkers

Context:

• Circumferential margin involvement (CMI) is a critical prognostic factor in rectal cancer.
• Accurate detection of CMI is essential for treatment planning and predicting patient outcomes.
• Middle and low rectal cancers present unique challenges for margin assessment.

Purpose:

• To evaluate the efficacy of combining Hematoxylin and Eosin (HE) staining with immunohistochemistry (IHC) for detecting CMI in middle and low rectal cancer.
• To identify clinicopathological factors associated with CMI in this patient cohort.

Summary:

• A study involving 41 patients with middle and low rectal cancer utilized HE staining and IHC (CK20, CDX2, MMP7) to assess CMI.
• The combined approach demonstrated a significantly higher CMI detection rate (36.6%) compared to single methods (HE: 21.9%, IHC: 26.8%-31.7%).
• CMI was significantly associated with poorly differentiated tumors, lower tumor location ( < 5 cm from anal verge), and lymph node metastasis (N1/N2).

Impact:

• Combining HE staining and IHC enhances the detection rate of CMI, potentially leading to more accurate staging.
• Identifying CMI's association with tumor differentiation, location, and metastasis aids in risk stratification and personalized treatment strategies.
• Improved CMI detection can influence surgical decisions and adjuvant therapy recommendations for rectal cancer patients.