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Using the Fat-Clearing Technique to Improve Lymph Node Retrieval in Colorectal Cancer.

Chih-Ching Yeh1,2, Chan-Feng Pan1, Hung-Wei Liu1

  • 1Department of Pathology and Laboratory Medicine, 38024Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.

International Journal of Surgical Pathology
|November 27, 2020
PubMed
Summary

An improved fat-clearing technique significantly increases lymph node retrieval from colorectal cancer specimens. This method enhances staging accuracy by yielding more lymph nodes compared to traditional manual methods.

Keywords:
colorectal cancerfat-clearing techniquelymph node

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Area of Science:

  • Surgical Pathology
  • Colorectal Cancer Staging
  • Anatomical Pathology

Background:

  • Accurate staging of colorectal carcinoma is crucial for patient prognosis and treatment.
  • The College of American Pathologists recommends harvesting at least 12 lymph nodes for adequate staging.
  • Current manual lymph node harvesting techniques are labor-intensive and time-consuming.

Purpose of the Study:

  • To evaluate the efficacy of an improved fat-clearing technique for lymph node retrieval from colorectal cancer specimens.
  • To compare the number of lymph nodes retrieved using the improved technique versus the conventional manual method.
  • To assess the impact of the improved technique on achieving the recommended lymph node yield for staging.

Main Methods:

  • Seventy colorectal cancer resection specimens were analyzed.
  • Specimens were divided into two groups: 35 processed with the conventional manual inspection and palpation technique, and 35 with the improved fat-clearing technique.
  • Four pathology residents evaluated the specimens and retrieved lymph nodes.

Main Results:

  • The improved fat-clearing technique significantly increased the mean lymph node yield from 14.7 ± 6.2 to 20.8 ± 9.0 lymph nodes per specimen (P < .05).
  • The percentage of specimens with at least 12 lymph nodes increased from 80% to 91% with the improved technique.
  • The fat-clearing method proved effective and practical for routine gross examination.

Conclusions:

  • The improved fat-clearing technique is an effective method for increasing lymph node yield in colorectal cancer specimens.
  • This technique enhances the ability to meet recommended lymph node harvest guidelines for accurate staging.
  • The improved fat-clearing technique is practical and suitable for routine implementation in pathology laboratories.