Can the Ki-67 Labeling Index in Biopsy Specimens Predict the World Health Organization Grade of Rectal Neuroendocrine Tumors?

• Published in: Digestive diseases (Basel) Vol. 36; no. 2; p. 118
• Main Authors: Sugimoto, Shinya, Hotta, Kinichi, Shimoda, Tadakazu, Imai, Kenichiro, Ito, Sayo, Yamaguchi, Yuichiro, Takizawa, Kohei, Kakushima, Naomi, Tanaka, Masaki, Kawata, Noboru, Yoshida, Masao, Ishiwatari, Hirotoshi, Matsubayashi, Hiroyuki, Ono, Hiroyuki
• Format: Journal Article
• Language: English
• Published: Switzerland 01.01.2018
• Subjects: Adult; Aged; Aged, 80 and over; Biopsy; Female; Humans; Ki-67 Antigen - metabolism; Male; Middle Aged; Neoplasm Grading; Neuroendocrine Tumors - metabolism; Neuroendocrine Tumors - pathology; Predictive Value of Tests; Rectal Neoplasms - metabolism; Rectal Neoplasms - pathology; Rectal Neoplasms - surgery; Rectum - metabolism; Rectum - pathology; Retrospective Studies; Sensitivity and Specificity; Staining and Labeling; World Health Organization; Ki-67 labeling index; World Health Organization grade; Neuroendocrine tumor; Biopsy; Rectum
• ISSN: 1421-9875
• DOI: 10.1159/000484083

Being grade 2 is a known risk factor for metastasis in rectal neuroendocrine tumors (R-NETs). We aimed to identify the efficacy of the Ki-67 labeling index (LI) in endoscopic biopsy specimens to predict the World Health Organization (WHO) grade of R-NETs. A total of 59 patients with 60 R-NETs (43 WHO grade 1 and 17 WHO grade 2), treated between October 2002 and December 2014, were retrospectively evaluated. The patients included in the study underwent biopsies followed by endoscopic submucosal resection with a ligation device, trans-anal full-thickness surgical resection, or radical surgery with lymph node dissection. The Ki-67 LI in the biopsy and resected specimens were compared between the 2 tumor grade groups, and the diagnostic sensitivity, specificity, and positive and negative predictive values for the detection of WHO grade 2 tumors were evaluated. The sensitivity, specificity, and positive and negative predictive values of the Ki-67 LI in biopsy specimens for predicting grade 2 tumors were 53% (9 of 17), 95% (41 of 43), 100% (9 of 9), and 87% (41 of 47), respectively. Pearson's rank correlation coefficient between the Ki-67 LI in the biopsy and resected specimens was 0.92. The Ki-67 LI of the biopsy specimen is useful for determining the appropriate treatment for R-NETs.