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HOME > J Pathol Transl Med > Volume 35(6); 2001 > Article
Original Article Expressions and Diagnostic Usefulness of MIB-1 and p53 in Uterine Smooth Muscle Tumors.
Mi Jin Kim, Yong Jin Kim, Seung Ho LeeSeungHo
Journal of Pathology and Translational Medicine 2001;35(6):524-530
DOI: https://doi.org/
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Departments of Pathology and Obstetrics and Gynecology, Yeungnam University, College of Medicine, Daegu 705-035, Korea. mjkap@med.yu.ac.kr

Controversy still remains concerning the criteria for the categorization of uterine smooth muscle tumors by conventional histologic examination. Various ancillary techniques have been used to improve diagnostic accuracy.
Immunohistochemical study of MIB-1 and p53 was performed on 10 usual leiomyomas (UL), 13 cellular leiomyomas (CL), 5 bizarre leiomyomas (BL), 2 cases of intravenous leiomyomatosis (IL), 5 smooth muscle tumors of uncertain malignant potential (STUMP) and 8 leiomyosarcomas (LMS), to investigate the diagnostic value of MIB-1 and p53 in uterine smooth muscle tumors.
The MIB-1 labelling index was low in ULs and their variants (mean 5.67+/-5.53), but it was increased in STUMPs (17.67+/-6.51) and markedly increased in LMSs (35.71+/-11.35). In ULs and their variants, no immunostaining for p53 was noted except in one case of BL, while 2 (40%) of 5 STUMPs and 3 (38%) of 8 LMSs showed positive reactions for p53. There were significant differences among leiomyoma, STUMP and LMS in the MIB-1 labelling index and p53 expression.
These results suggest that both abnormal expressions of p53 and a high MIB-1 labelling index are frequently associated with leiomyosarcoma. Our data also indicate that the classification system of Kempson and Hendrickson is well correlated with the MIB-1 labelling index.

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