BACKGROUND: Porokeratosis is a rare group of disorders of epidermal keratinization which is histologically characterized by the presence of cornoid lamella. The malignant potential of porokeratotic lesions is well recognized. Recently, frequent p53 overexpression has been reported and might be related to the carcinogenic potential of porokeratosis. OBJECTIVE: To compare previous foreign results of p53 overexpression in porokeratosis with Korean cases, we studied 24 Korean cases of porokeratosis(7 of Porokeratosis of Mibelli, 14 of DSAP, 2 of Linear Porokeratosis, and 1 of PPPD). METHODS: Immunohistochemical staining was done on the paraffin sections using a labelled streptavidin-biotin-peroxidase complex method with primary antibodies against p53 protein and Ki-67. RESULTS: The epidermis central to cornoid lamellae was positive for p53 protein in 15 of the 24 cases. The epidermis beneath the cornoid lamellae was positive in 3 of the central positive 15 cases and the peripheral epidermis was positive in 1 of the central positive 15 cases. Staining for Ki-67 antigen was increased above background levels in 9 of 24 specimens. No correlation was detected between p53 protein expression and Ki-67 antigen expression. CONCLUSION: The p53 overexpression was observed in Korean cases of porokeratosis but, the expression rate of p53 in Korean cases of porokeratosis was relative less than previous foreign reports.
Antibodies ; Epidermis ; Ki-67 Antigen* ; Paraffin ; Porokeratosis*

Ki-67 has an important application value in clinical practice. However, it is still a little tough in clinical application because of the debate on the cut-off definition of Ki-67 index. This review summarizes most studies on the prognostic and predictive value of Ki-67, analyzes the reasons for the discrepancies among the studies cited, and presents the necessity and clinical significance of scientifically defining the cut-off of Ki-67 index, providing a theoretical basis for Ki-67 in clinical application.
Breast Neoplasms ; diagnosis ; Humans ; Ki-67 Antigen ; analysis ; Prognosis

OBJECTIVE: In this study, we investigated the relationship between the histologic grading of meningiomas and proliferative potentials determined by the Ki-67, proliferating cell nuclear antigen(PCNA) and flow cytometry (FCM) with the aim of determining whether these potentials can be used as a parameter to the proliferative activity, in particular of atypical and malignant meningiomas. METHODS: This study consisted of 47 meningiomas(6 malignant, 14 atypical, and random sampled 27 benign meningiomas). By immunohistochemical staining of Ki-67 and PCNA on formalin-fixed, paraffin-embedded sections, the anti-human rabbit polyclonal antibody against Ki-67 antigen and anti-PCNA monoclonal antibody(PC10) scores were counted. FCM was also performed on paraffin-embedded tissue using a selective staining technique for DNA. DNA ploidy, S-phase fraction, and proliferative index(PI)) were determined. RESULTS: The results are summarized as follows; 1) Proliferation rates as assessed by Ki-67 and PCNA closely correlated with the degree of anaplastic histologic features. 2) Proliferative potentials determined by FCM(S-phase fraction and PI) were not able to distinguish between benign and atypical/malignant meningiomas. 3) DNA ploidy was not a useful indicator of histologic grade in these tumors. 4) Proliferative potentials such as Ki-67 staining index(SI) and PCNA SI did not correlate with the ploidy pattern. 5) There was a linear correlation between Ki-67 SI and PCNA SI, but we could not find a correlation between Ki-67 SI and S-phase fraction or PI. Our results also did not show a statistically signficant correlation between PCNA SI and S-phse fraction or PI. CONCLUSIONS: We conclude that evaluation of the proliferative potentials with Ki-67 and PCNA is important as an additional factor for the prediction of malignancy in meningiomas. A dual study of Ki-67 and PCNA SIs on the same tissue might improve the accuracy with which the proliferative potential of a tumor can be predicted. We demonstrated that FCM in meningiomas is not valuable in predicting the behavior of these neoplasms, but we did observe a trend toward more malignancy with higher percent S-phase fraction and higher PI. Analysis of the S-phase fraction and PI might therefore be a useful tool to discriminate among histologic grades of meningiomas.
DNA ; Flow Cytometry* ; Ki-67 Antigen ; Meningioma* ; Ploidies ; Proliferating Cell Nuclear Antigen*

Objective: To investigate the expression of VISTA and PD-L1 in triple-negative breast cancer (TNBC) and to explore its relationship with clinicopathologic features and prognosis. Methods: Ninety TNBC patients who underwent surgical resections between 2016 to 2018 in Jiangsu Province Hospital were selected. The expression of VISTA and PD-L1 in both tumor cells and immune cells was evaluated by immunohistochemistry, and the relationship with clinicopathologic parameters and prognosis was analyzed. Results: VISTA was expressed in 17.8% (16/90) of the tumors. The expression of VISTA in tumor cells was related to a higher Ki-67 proliferation index (P=0.02) and higher number of tumor-infiltrating lymphocytes (TIL, P<0.01). VISTA was expressed in 71.1% (64/90) of the immune cells and the expression correlated with smaller tumor size (P=0.02), lower T stage (P=0.04), higher number of TIL (P<0.01), higher number of CD8⁺T cells (P=0.03) and higher Ki-67 proliferation index (P=0.02). PD-L1 was expressed in 17.8% (16/90) of the immune cells and the expression correlated with higher histologic grade (P=0.04), higher Ki-67 proliferation index (P=0.02) and higher number of TIL (P<0.01). VISTA expression was higher in immune cells within TNBC patients than PD-L1 (P<0.01). Among 90 TNBC patients, complete follow-up was obtained in 85 patients, 8 of whom had recurrences or metastasis after surgery, and two patients cases died of recurrences or metastasis. Conclusions: The expression rate of VISTA is higher than that of PD-L1 in TNBC. The expression of VISTA in immune cells predicts a lower T stage. VISTA may act as an effective immunotherapy target.
B7-H1 Antigen/metabolism* ; Humans ; Ki-67 Antigen ; Prognosis ; Recurrence ; Triple Negative Breast Neoplasms/surgery*

In order to investigate the expression levels of Pin1 mRNA and protein in cervical cancer and its association with Ki67 and their clinical significance, amplification of Pin1 gene was examined by RT-PCR, and the expression of both Pin1 and Ki67 protein was detected by immunohistochemistry in cervical cancer tissues. It was shown that the expression levels of Pin1 were higher in cervical cancer than in normal cervical tissues (P < 0.05). The expression of Pin1 protein was increased progressively along with the disease process from normal cervix to CIN and to cervical cancer (P < 0.05). No significant difference in the Pin1 expression was found between disease stages (FIGO), pathological grades or pelvic lymph node metastasis status (P > 0.05). The expression of Pin1 was significantly higher in adenocarcinoma than in squamous carcinoma of the uterine cervix (P < 0.05). In cervical cancer, the overexpression of Pin1 was positively correlated with that of Ki67 (P < 0.05). These results suggested that the overexpression of Pin1 was closely related with cancer cell proliferation or progression of cervical cancer and contributed to oncogenesis. Pin1 may serve as a potential marker for cervical cancer diagnosis.
Cervical Intraepithelial Neoplasia/metabolism ; Ki-67 Antigen/*biosynthesis ; Ki-67 Antigen/genetics ; Peptidylprolyl Isomerase/*biosynthesis ; Peptidylprolyl Isomerase/genetics ; Tumor Markers, Biological ; Uterine Cervical Neoplasms/*metabolism

BACKGROUND: Actinic keratosis is a proliferation of transformed neoplastic keratinocytes that are confined to the epidermis, and is induced by exposure to UV radiation in sunlight. The neoplastic transformation is primarily due to p53 gene mutation. OBJECTIVE: Our purpose was to study the correlation among p53 expression, epidermal hyperplasia, dermal inflammation, Ki-67 expression, and p21 expression in the actinic keratosis. METHODS: We reviewed the histopathologic slides of 21 cases of actinic keratosis. We performed immunoperoxidase staining using monoclonal antibody to p53 protein, Ki-67 antigen, p21 protein on the specimen. We stastically analyzed the correlation among p53 expression, epidermal hyperplasia, and dermal inflammation, Ki-67 expression, and p21 expression. RESULT: We found higher expression of p53 in the actinic keratosis with hyperplastic epidermis but this finding was not stastically siginificant (p=0.233). There was no correlation between the expression level of p53 and the severity of dermal inflammation (p=0.755). The expression level of p53 had the significant positive correlation with the expression level of Ki-67 (p=0.001). There was no correlation between the expression level of p53 and the expression level of p21 (p=0.116). CONCLUSION: We observed that p53 expression had a significant positive correlation to only Ki-67 expression. We suggested that further study would be needed on the correlation among p53 expression, epidermal hyperplasia, dermal inflammation, and p21 expression in actinic keratosis.
Actins* ; Epidermis ; Genes, p53 ; Hyperplasia* ; Inflammation* ; Keratinocytes ; Keratosis, Actinic* ; Ki-67 Antigen ; Sunlight

Almost all colorectal carcinomas have been thought to develop from pre-existing adenomas. However, some colorectal carcinomas can arise directly from normal flat mucosa, and usually form infiltrative mass at the early stage. The carcinogenesis of this infiltrative carcinoma may be different from the well-known adenoma-carcinoma sequence, which usually forms a polypoid mass. The purpose of this study is to investigate the different expression of various oncogenes in polypoid carcinoma and infiltrative carcinoma. We performed immunohistochemical staining on p53, bcl-2, c-erbB-2 and MIB-1 in 29 polypoid carcinomas arised from adenomas, and 21 infiltrative carcinomas. The average tumor size of infiltrative carcinomas (5.5 cm) was larger than that of polypoid carcinomas (3.1 cm), and the polypoid carcinomas were differentiated more than the infiltrative carcinomas. The results of p53, bcl-2, c-erbB-2, and MIB-1 antisera immunoreactivity in the polypoid carcinoma were 79%, 17%, 21%, and 100%, and those in the infiltrative carcinoma were 71%, 29%, 29%, and 100%, respectively. However the diffuse positivities of p53 and MIB-1 antisera were slightly higher in the infiltraive carcinomas (62%, 76%) than in the polypoid carcinomas (55%, 41%) (p=0.63, 0.01). And the results of p53 and c-erbB-2 immunoreactivity in the adenomas were 52% and 17%, respectively, which is significantly lower than that in the polypoid carcinoma(p=0.03, 0.74). The immunoreactivty of bcl-2 in the adenoma was 72%, which was significantly higher than that in the polypoid carcinoma (17%) (p<0.01). In summary, we did not show the significant difference in expression of p53, bcl-2, c-erbB-2, and MIB-1 proteins between polypoid and infiltrative carcinomas. However, the tendency of infiltrative carcinomas having a more aggressive nature suggests another carcinogenetic mechanism is involved in the colorectal carcinogenesis.
Adenoma ; Carcinogenesis ; Colorectal Neoplasms* ; Immune Sera ; Ki-67 Antigen ; Mucous Membrane ; Oncogenes

The aim of this study was to determine the relationship of alpha-smooth muscle actin (ASMA) and the proliferation marker Ki-67 of glomerulonephritis (GN). Immunohistochemical stainings with the usual streptavidin-biotin peroxidase method were performed on 86 renal biopsies using monoclonal 1A4 and Ki-67. The results of the quantitative evaluation of ASMA and Ki-67 were analyzed for the correlation between positive value of ASMA and Ki-67 in different GN. ASMA expressions of glomeruli were highest in acute post-infectious GN [APGN; 16.9 Fraction Volume (FV)%], followed by unclassified proliferative GN (UnGN; 12.5 FV%), membranoproliferative GN (MPGN; 8.5 FV%), lupus nephritis (LupusN; 6.3 FV%), IgA nephritis (IgAN; 5.6 FV%), and normal control (0.1 FV%). The Ki-67 staining was considerably elevated in lupusN (4.3 Ki-67 positives/glomerulus), APGN (2.7), MPGN (2.5), UnGN (1.66), IgAN (0.5), compared with that in normal control group (0.1 Ki-67 positives/glomerulus). Ki-67 value in each category of glomerular diseases was significantly different from that in the control biopsies (p<0.004). The relationship between morphometric results of ASMA and Ki-67 was statistically significant regardless of the diagnosis. (rs=0.425, p=0.000, ASMA= 0.1113+0.1665 Ki-67). In conclusion, the immunohistochemical assessment of ASMA and Ki-67 expression in GN might be a reliable indicator for the progression of GN. This study indicates that active cellular proliferation is associated with increased actin deposition in glomeruli.
Actins/*analysis ; Biopsy ; Cell Division ; Glomerulonephritis/*metabolism/pathology ; Human ; Immunohistochemistry ; Ki-67 Antigen/*analysis ; Kidney/pathology

BACKGROUND: There have been a few studies concerning the differential diagnosis between follicular adenomas and minimally invasive follicular carcinomas, but it is difficult to exclude the possibility of minute capsular and/or vascular invasion throughout the capsular areas as a whole. METHODS: We examined the diagnostic usefulness of Ki-67 labelling index and bax expression for the differential diagnosis of follicular adenomas and minimally invasive follicular carcinomas. RESULTS: The result of immunohistochemical staining with Ki-67 and bax antibodies were analyzed in 58 cases of follicular neoplasms from 1996 to 1999. Of 58 cases, 35 were follicular adenomas and 23 were minimally invasive follicular carcinomas. The Ki-67 labelling index was significantly higher in minimally invasive follicular carcinoma of the thyroid (Ki-67 labelling index, 1.62+/-0.35%) than follicular adenoma (0.46+/-0.21%) (P<0.05). Of the follicular adenomas, Ki-67 labelling index of the tumor with 5 cm or more in diameter was 0.38+/-0.13%, while that of the tumor with less than 5 cm was 0.51+/-0.24%. Of the minimally invasive follicular carcinoma, Ki-67 labelling index of the tumor with 5 cm more was 1.30+/-0.07%, while that of the tumor with less than 5 cm was 1.65+/-0.37%. Diffuse bax expression was seen in 27 of 35 cases of follicular adenomas and 2 of 23 cases of minimally invasive follicular carcinoma (P<0.05). CONCLUSIONS:Our findings suggest Ki-67 labelling index and the degree of bax expression are useful markers for the differential diagnosis between the follicular adenoma and the minimally invasive follicular carcinoma of the thyroid.
Adenoma ; Antibodies ; Apoptosis ; Diagnosis, Differential ; Ki-67 Antigen ; Thyroid Gland* ; Thyroid Neoplasms

BACKGROUND: 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. METHODS: 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. RESULTS: 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. CONCLUSIONS: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.
Classification ; Immunohistochemistry ; Ki-67 Antigen ; Leiomyoma ; Leiomyomatosis ; Leiomyosarcoma ; Muscle, Smooth* ; Smooth Muscle Tumor* ; Uterine Neoplasms