Document Detail

Expression of Mcm2, geminin and Ki67 in normal oral mucosa, oral epithelial dysplasias and their corresponding squamous-cell carcinomas.
Jump to Full Text
MedLine Citation:
PMID:  19293805     Owner:  NLM     Status:  MEDLINE    
Proteins necessary for the normal regulation of the cell cycle include minichromosome maintenance protein 2 (Mcm2) and geminin. These are overexpressed in several premalignant and malignant tumours. The Mcm2/Ki67 ratio can be used to estimate the population of cells that are in early G(1) (licensed to proliferate), and the geminin/Ki67 ratio can determine the relative length of G(1). A high ratio indicates a short G(1) and a high rate of cell proliferation. Mcm2 and geminin have been scarcely explored in oral epithelial dysplasia (OED) and oral squamous-cell carcinoma (OSCC). The purpose of this study was to identify the expression pattern of Mcm2, Ki67 and geminin in normal oral mucosa (NOM), OED and their subsequent OSCC, to determine if expression could help predict the prognosis of OED. Paraffin sections of 41 OED cases that progressed to carcinoma, 40 OED without malignant progression, 38 OSCC and 15 NOM were immunostained with antibodies against Mcm2, geminin and Ki67. Labelling indices (LIs) increased progressively from NOM, OED and OSCC (Mcm2, P<0.001; geminin, P<0.001 and Ki67, P<0.001). In all the OED cases (n=81) the levels of expression of Mcm2 (LI, 73.6), geminin (LI, 24.4) and Ki67 (LI, 44.5) were elevated indicating a constant cell-cycle re-entry. When the OED groups were compared, Mcm2 protein expression was higher in the OED with malignant progression (P=0.04), likewise there was a significant increase in the Mcm2/Ki67 and geminin/Ki67 ratios (P=0.04 and 0.02 respectively). Mcm2 and geminin proteins seem to be novel biomarkers of growth and may be useful prognostic tools for OED.
A Torres-Rendon; S Roy; G T Craig; P M Speight
Related Documents :
16641895 - Overexpression of the axl tyrosine kinase receptor in cutaneous scc-derived cell lines ...
9525275 - Quantitation of chemopreventive synergism between (-)-epigallocatechin-3-gallate and cu...
15163165 - Concomitant vinorelbine and radiation in head and neck squamous cell carcinoma in vitro.
7722465 - Proteolytic processing is required for viral superantigen activity.
16535145 - Growth kinetics of thiobacillus thiooxidans on the surface of elemental sulfur.
10433835 - Fate mapping of drosophila embryonic mitotic domain 20 reveals that the larval visual s...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-03-17
Journal Detail:
Title:  British journal of cancer     Volume:  100     ISSN:  1532-1827     ISO Abbreviation:  Br. J. Cancer     Publication Date:  2009 Apr 
Date Detail:
Created Date:  2009-04-01     Completed Date:  2009-04-24     Revised Date:  2013-06-02    
Medline Journal Info:
Nlm Unique ID:  0370635     Medline TA:  Br J Cancer     Country:  England    
Other Details:
Languages:  eng     Pagination:  1128-34     Citation Subset:  IM    
Department of Oral and Maxillofacial Pathology, School of Clinical Dentistry, University of Sheffield, Sheffield, UK.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Carcinoma, Squamous Cell / chemistry*
Case-Control Studies
Cell Cycle Proteins / analysis*
Ki-67 Antigen / analysis*
Middle Aged
Mouth Mucosa / chemistry*
Mouth Neoplasms / chemistry*
Nuclear Proteins / analysis*
Precancerous Conditions / chemistry*
Retrospective Studies
Tumor Markers, Biological / analysis
Reg. No./Substance:
0/Cell Cycle Proteins; 0/GMNN protein, human; 0/Ki-67 Antigen; 0/MCM2 protein, human; 0/Nuclear Proteins; 0/Tumor Markers, Biological

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): Br J Cancer
ISSN: 0007-0920
ISSN: 1532-1827
Publisher: Nature Publishing Group
Article Information
Download PDF
Copyright 2009, Cancer Research UK
Received Day: 13 Month: 11 Year: 2008
Revision Received Day: 05 Month: 02 Year: 2009
Accepted Day: 10 Month: 02 Year: 2009
Electronic publication date: Day: 17 Month: 03 Year: 2009
collection publication date: Day: 31 Month: 03 Year: 2009
Print publication date: Day: 07 Month: 04 Year: 2009
Volume: 100 Issue: 7
First Page: 1128 Last Page: 1134
ID: 2669983
Publisher Item Identifier: 6604967
DOI: 10.1038/sj.bjc.6604967
PubMed Id: 19293805

Expression of Mcm2, geminin and Ki67 in normal oral mucosa, oral epithelial dysplasias and their corresponding squamous-cell carcinomas
A Torres-Rendon1
S Roy1
G T Craig1
P M Speight1*
1Department of Oral and Maxillofacial Pathology, School of Clinical Dentistry, University of Sheffield, Claremont Crescent Sheffield S10 2TA, UK
*Author for correspondence:

Oral squamous-cell carcinoma (OSCC) represents the majority of malignant lesions of the oral cavity. Despite refinement of surgical techniques in the past few decades once invasive cancer is formed, the prognosis is poor with an average 5-year survival rate of 40% of affected patients (Mork, 1998; Diaz et al, 2003). Early diagnosis of OSCC can improve patient survival and reduce significantly the high mortality rates. It is thought that most, if not all, OSCC are preceded by a period during which the affected epithelium shows evidence of epithelial dysplasia, although this may not always be clinically apparent (Napier and Speight, 2008). Currently, there are no markers that can reliably predict malignant progression in oral dysplastic lesions.

Cell-cycle regulatory proteins, including those that promote initiation of DNA synthesis, such as minichromosome maintenance proteins (MCM) and those that help to regulate cell differentiation and cell proliferation such as geminin are deregulated in a number of malignant lesions from different human organs. These have been shown to be effective markers for the early detection of cancer, particularly in samples from suspected epithelial malignancies (Freeman et al, 1999; Stoeber et al, 1999; Gonzalez et al, 2004).

Minichromosome maintenance proteins (Mcm 2–7) are a pre-requisite for DNA replication and cell-cycle initiation (Kearsey and Labib, 1998) and are expressed throughout the whole cell cycle including cells leaving G0 to enter into the early G1 phase. This characteristic is not found in Ki67, which is widely used to assess proliferation; and therefore MCM proteins specifically Mcm5 and Mcm2 have been proposed as potential prognostic markers in dysplastic lesions and cancer (Freeman et al, 1999; Stoeber et al, 1999; Alison et al, 2002; Going et al, 2002).

Geminin, a novel proliferation marker is present from the G1–S transition to early M phases (McGarry and Kirschner, 1998) and helps to regulate cell-cycle initiation by impeding a second pre-replication complex assembly once replication has started (McGarry and Kirschner, 1998; Tachibana et al, 2005). It has also been suggested that geminin levels may be altered in cancer cells as it has been found to be overexpressed in several cancer cell lines (Xouri et al, 2004). In addition, elevated expression has been linked with a poor clinical outcome in renal cell carcinomas (Dudderidge et al, 2005), and has been shown in a range of other malignancies (Wohlschlegel et al, 2002; Shetty et al, 2005).

Ki67 is present throughout the complete cell cycle with the exception of early G1 phase (Gerdes et al, 1984). When Mcm2 and geminin are evaluated along with Ki67, the combination may provide extra information about proliferation rates in epithelial compartments (Quaglia et al, 2006). The geminin/Ki67 ratio can potentially evaluate the relative length of G1. The higher the ratio, the shorter G1 indicating an increased proliferation rate and therefore a poor prognosis, as shown in oligodendroglial tumours (Wharton et al, 2004). Another suggested prognostic parameter is the Mcm2/Ki67 ratio (Shetty et al, 2005), which can estimate the proportion of cells that are licensed to proliferate (early G1).

The purpose of this study was to determine the immunohistochemical expression pattern of these proteins in normal oral mucosa (NOM), oral epithelial dysplasia (OED) and OSCC, and to determine if abnormal expression could serve as a prognostic marker of malignant progression in OED.

Material and methods

The study design was a retrospective case–control study identifying lesions of OED that had progressed to malignancy and comparing the protein expression with a cohort of closely matched lesions that had not progressed at the time of sampling. Ethical approval was obtained from the South Sheffield Research Ethics Committee (SSREC/03/206).

Patient selection

From a total of over 1000 cases of OED in the archives of the diagnostic service of the Oral and Maxillofacial Pathology Department of the University of Sheffield, 41 were identified that had progressed to OSCC. For each case the first biopsy showing evidence of dysplasia was chosen for analysis. From the remaining cases 40 closely matched OED that had not progressed to carcinoma after a minimum follow-up of 4.5 years were selected. Of the 41 cases that had progressed, 38 of the OSCC were available for analysis.

The final total of 134 cases selected for analysis comprised 41 OED that had progressed to carcinoma, 40 OED that did not show malignant progression, 38 OSCC from the 41 cases that had progressed and 15 samples of NOM. If multiple biopsies for OED were present from the same patient, the first OED biopsy was selected; if the first biopsy was from a different site to that of the subsequent OSCC, then, if available, the next biopsy that matched the same site as the subsequent OSCC was chosen. Synchronous lesions were excluded by only selecting cases where the minimum time between the diagnosis of OED and carcinoma was 6 months. OED and OSCC were histopathologically graded by two experienced oral pathologists (PMS and GTC) according to the latest WHO guidelines (Barnes et al, 2005).


The antibodies used in this study were anti-Mcm2 (BM28) mouse anti-human monoclonal antibody (clone 46; BD Transduction Laboratories, Lexington, KY, USA), geminin 95 (Gem95) polyclonal rabbit anti-human (Wharton et al, 2004) antibody and anti-human Ki67 monoclonal mouse antibody (clone MIB-1) (Dako, Glostrup, Denmark). All these proteins have been previously characterised (Gerdes et al, 1984; Todorov et al, 1994; Lea et al, 2003; Wharton et al, 2004).

Paraffin-embedded formalin-fixed tissue sections (4 μm) were de-waxed in xylene and re-hydrated through graded alcohols to water. For antigen retrieval, sections were pre-treated in a pressure cooker, in 0.1 M citrate buffer (pH 6.0) for 1.5 min for Ki67, and 3 min for Mcm2 and Gem95. Endogenous peroxidase activity was inhibited using peroxidase-blocking solution (DakoCytomation, Glostrup, Denmark) for 10 min. Tris buffer saline (TBS) sections were incubated with primary antibody for 1 h at room temperature using the following dilutions: Mcm2 (1 : 1000), Ki67 (1 : 50) and Gem95 (1 : 800). The detection system was ChemMate Detection kit (DakoCytomation), which included application of biotinylated secondary antibody for 30 min and horseradish peroxidase for 30 min. Two washes with TBS were applied between the primary and secondary antibodies. Positive expression was visualised after 7 min incubation with DAB. Slides were washed in running tap water, counterstained with Mayer's haematoxylin and mounted with low-viscosity DPX mounting medium.

Quantification method

Five representative fields per slide were examined at × 400 magnification under a light microscope with a rotating stage. Representative fields in OED were selected according to the most dysplastic areas and in OSCC were selected from the invasive front of the tumour. An eyepiece graticule was used and the epithelial–connective tissue interface was taken as the base of the square. All epithelial cells inside the area of the graticule were counted. Positive and negative epithelial cells and the total number of cells were recorded using a manual cell counter (The Denominator Co., CT, USA) and recorded in a computer. The labelling index (LI) was calculated by dividing the number of positive cells by the total number of cells per case and multiplying by 100. Intra-observer error was tested by re-examining 10% of the total number of cases. There were high levels of agreement according to the inter-class correlation coefficient for continuous data (P=0.00).

Statistical analysis

Statistical analyses were carried out using the SPSS 14.0 and GraphPad InStat statistical software. Mcm2, Ki67 and geminin were normally distributed according to the Kolmogorov–Smirnov test. Although Mcm2/Ki67 and geminin/Ki67 ratios were normally distributed, because of their intrinsic constrained range of results these were treated as non-parametric. Therefore ANOVA and t-test analysis were used to evaluate differences between Mcm2, Ki67 and geminin LIs in the NOM, OED and OSCC groups. Mann–Whitney and Kruskal–Wallis tests were used to evaluate differences in the Mcm2/KI67 and geminin/Ki67 ratios. The general linear model (GLM) of repeated-measures analyses was used to evaluate the differences among the LI of the proteins (Mcm2, Ki67 and geminin) in every group (e.g. NOM or OED or OSCC). Scatter plots were used to observe the associations between proteins. Spearman's correlation coefficient was used to evaluate correlation between protein expression and grade of dysplasia.


In the group of OED that progressed to carcinoma the mean age of the patients was 59.9 (standard deviation (s.d.) ±15.6) with 23 men (56%) and 18 women (44%). Malignant transformation occurred within 6–200 months (mean 56.6±52.6). Twenty-nine lesions were graded as severe epithelial dysplasia, eleven as moderate and one as mild. In the group of OED with no history of malignant progression the mean age was 60.3 (±14.8) and there was a follow-up time of 54–349 months (mean 176.0±64); 25 (62.5%) were men and 15 (37.5%) were women. Twenty-three lesions were graded as severe epithelial dysplasia and 17 as moderate. Of the total 81 OED samples 1 was mild dysplasia, 28 were moderate dysplasias and 52 were severe dysplasias. The mean age of the OSCC group was 65.4 (±15.9). Five cases were early invasive OSCC, 22 were well differentiated, 10 were moderately differentiated and 1 was poorly differentiated. The mean age of the NOM cases was 37.2 (±19.1).

From the 134 cases, high-quality immunohistochemical staining was available in 131 samples for Mcm2, 129 samples for Ki67 and 133 samples for geminin.

Expression of cell-cycle proteins in normal oral mucosa

Normal oral mucosa showed the lowest LI for Mcm2, Ki67 and geminin and a low geminin/Ki67 ratio when compared to the OED groups and OSCC. The Mcm2/Ki67 ratio showed that Mcm2 expression was higher than Ki67 with a ratio of 1.75 (Table 1).

Mcm2, Ki67 and geminin protein were located mainly in the suprabasal compartment. In most of the NOM samples there was a characteristic absence of protein expression in the basal layer, specially for Ki67 and geminin (Figure 1A–C).

Expression of cell-cycle proteins in oral epithelial dysplasias

In all OED samples there was a higher expression of Mcm2 when compared to Ki67 and geminin (Table 1; Figure 1D–F). Mcm2 expression extended from the basal and suprabasal compartments to the mid-prickle cell region (Figure 1D) and in some cases to the surface layers.

Expression of Mcm2 was higher (P=0.04) in the OED that progressed to OSCC than in those that did not progress (Table 2). In contrast, there was no significant difference in the geminin and Ki67 LIs between the two OED groups (Table 2). The localisation of Ki67 and geminin was expressed in the same areas as Mcm2, but in a significantly (GLM P<0.001) lower proportion of cells (Table 2; Figure 1E and F).

The Mcm2/Ki67 and geminin/Ki67 ratios (Table 2) were higher in the OED with malignant progression compared to the OED with no history of malignant transformation (P=0.04 and 0.02 respectively).

There was no correlation between the grade of dysplasia and the LI of the different proteins.

Expression of cell-cycle proteins in oral squamous-cell carcinoma

Expression of Mcm2, Ki67 and geminin in the OSCC samples was seen in a high number of epithelial cells with stronger staining intensities at the invasive front (Figure 2A, C and D). When keratin pearls were present expression of Mcm2, Ki67 and geminin was seen around the periphery of the islands (Figure 2B).

The Mcm2/Ki67 ratio in OSCC was lower than in OED and NOM, but the geminin/Ki67 ratio was increased (Table 1).

There was no correlation between the level of tumour differentiation and the LI of the different proteins.

The LIs of Mcm2, Ki67 and geminin were progressively higher from NOM through OED to OSCC (Table 1; ANOVAs, P<0.001). In addition, there was a positive linear association between Mcm2 and Ki67 in all the analysed samples (Figure 3) as well as between geminin and Ki67 (Figure 4).


Others have described the importance of pre-replication proteins, especially Mcm2, as prognostic markers in dysplasias and neoplasia at various sites in the human body (Williams et al, 1998, 2004; Stoeber et al, 1999; Meng et al, 2001; Wharton et al, 2001; Alison et al, 2002; Going et al, 2002; Eward et al, 2004; Gonzalez et al, 2004; Dudderidge et al, 2005; Quaglia et al, 2006). In the oral mucosa only a few studies have explored this (Kodani et al, 2001, 2003; Scott et al, 2006). To the best of our knowledge, this is the first study in which geminin or Mcm2/Ki67 and geminin/Ki67 ratios have been evaluated in NOM or in oral dysplasias and carcinomas. Overall geminin and Mcm2 showed a clear association with proliferation (Ki67) and grade, the LI increased from normal mucosa to OED to OSCC (Figures 3 and 4).

The results of this study suggest that in NOM, most cells are in the G0 phase (not in cycle) with a lesser number in a licensed G0–G1 transition (demonstrated by Mcm2 expression). Only about 20% of cells are actually in the cell cycle (demonstrated by Ki67 and geminin expression). This suggests that the epithelial basal and suprabasal compartments in NOM have a low and controlled proliferation rate but with a continuous proliferative capacity. Low LIs in normal tissues have also been observed by other authors for Mcm2 and Ki67 in oral mucosa (Kodani et al, 2001), larynx (Chatrath et al, 2006) and prostate tissues (Meng et al, 2001), and for geminin in breast tissue (Shetty et al, 2005).

The absence of Mcm2 expression in a significant proportion of basal cells, and complete absence of Ki67 and geminin in this cell layer of NOM observed in this study, suggests that these cells are in a temporary G0 state. An in vitro study, using a fibroblast model system coupled to a cell-free DNA replication assay, identified a group of stem cells in intestinal epithelium that are unlicensed (Mcm2 negative) and with no geminin expression. According to the authors, these could be stem cells that may pass through a prolonged cell cycle as a defensive mechanism against possible genotoxic insult in rapidly proliferating tissues (Kingsbury et al, 2005). Similarly, a recent study (Takeda et al, 2006) has suggested that stem cells are present in the basal layer of NOM, based on expression of stem cell markers, cytokeratin 19 and p63. The low expression of Mcm2 in the basal layer of the normal oral epithelium was an unexpected finding but is in keeping with the suggestion of a self-defence mechanism to maintain a controlled cell proliferation of the oral mucosa.

In contrast to NOM, the levels of expression of Mcm2, geminin and Ki67 were elevated in OED indicating a constant cell-cycle re-entry with a high proportion of licensed and dividing cells. This has also been observed in studies of Mcm2 and Ki67 in Barrett's oesophagus (Going et al, 2002) and in neoplastic oesophagus using Mcm5 (Wharton et al, 2001).

The present study showed similar results to that of Kodani et al (2001), although the LIs for Mcm2 and Ki67 were higher in our study. The reason for this might be that Kodani et al quantified cells throughout the whole thickness of the epithelium, from basal to surface epithelial layers. Thus, the additional numbers of differentiated and non-expressing epithelial cells included in the upper third of the epithelium would have resulted in a lower overall percentage of positive expression and a lower LI. Quantification in the present study focused on the proliferative epithelial compartments where Mcm2, Ki67 and geminin are expressed more frequently. Other authors have evaluated Mcm2 and Ki67 in dysplastic lesions by dividing the epithelium into compartments. Nevertheless, the results from Kodani et al were similar to those reported here and showed a comparable increase in expression from NOM to OSCC.

Although these results need to be confirmed by other similar studies, Ki67 and geminin showed no significant difference between the OED groups, however Mcm2 had a marginally but significantly higher mean LI, in the OED that progressed to OSCC than the OED with no history of malignant progression, this was also observed previously (Kodani et al, 2001). These findings could suggest that cells in OED with malignant progression have an increased number of cells licensed to proliferate. Ibarra et al (2008) observed that a full complement of MCM proteins is essential to protect cells from the natural replicative stresses during S phase to maintain genome integrity. Therefore, the high levels of Mcm2 in the OEDs could suggest a similar defensive mechanism during genomic damage before malignant transformation occurs.

The Mcm2/Ki67 ratio was higher in OED that progressed to OSCC compared to OED with no malignant progression due to the high levels of Mcm2 in the first group. Likewise, the geminin/Ki67 ratio was higher, indicating a shorter G1 phase and an increased proliferation rate. Although the Mcm2/Ki67 and geminin/Ki67 ratios were significantly different between the OED with and without malignant progression (Table 2), the differences in the values are relatively small and this finding needs to be confirmed in further similar studies.

The results suggest that cells in oral squamous-cell carcinoma are in a high proliferation state as demonstrated by the high levels of Mcm2, geminin and Ki67 (Table 1; Figure 2). Although the LI for Mcm2 in the present study indicates that it is an effective proliferation marker, Ki67 showed the biggest difference in values from an LI of 44.55 in OED to 59.03 in OSCC (Table 1). A significant rise in Ki67 expression has also been observed in regenerative nodular lesions of cirrhotic liver that progressed to hepatocellular carcinoma, but not for Mcm2 and geminin (Quaglia et al, 2006).

The invasive front of OSCC was selected for protein evaluation, because this is considered to be more relevant for the understanding of the cell-cycle kinetics of cells involved with invasion into the adjacent tissues. This method may also be more reproducible as it is easier to standardise evaluation of the inferior limit (invasive front) of the lesion between different observers.

This is the first time that elevated geminin expression has been reported in OSCC (Table 1). This finding is consistent with previous immunohistochemical, immunoblotting and in situ hybridisation studies where geminin is overexpressed in cancer cell lines (Xouri et al, 2004) and unveiled as a proliferation marker in different human cancers (Wohlschlegel et al, 2002).

Further studies of OSCC evaluating Mcm2, Ki67 and geminin expression, along with their Mcm2/Ki67 and geminin/Ki67 LI ratios, may provide further evidence of their prognostic potential, especially if they can be correlated with mode of invasion, tumour size and cumulative disease-free survival.


Overall the LI of all proteins increased progressively from NOM to OED to OSCC. Geminin has been shown as a proliferative marker in these oral tissues. Elevated levels of expression of Mcm2, Ki67 and geminin in OED suggest a constant cell-cycle re-entry. We also observed that Mcm2 as a proliferation marker may be superior to Ki67 because it indicates licensed capacity. In addition, Mcm2 was marginally but significantly more elevated in OED that progressed to OSCC. The findings reported here require confirmation from further studies; however, information on Mcm2, Ki67 and geminin may be of prognostic value in OEDs.

This project was funded by Sheffield Hospitals Charitable Trust and the Mexican National Council of Science and Technology (CONACYT) (scholarship for ACTR number 151236). Antibodies Mcm2 and geminin were provided by Professor Gareth Williams and Dr Kai Stoeber from the Wolfson Institute for Biomedical Research, University College London. We thank Mr Marco Loddo from the Department of Histopathology of the University College London for his technical advice on the immunostaining technique.

Alison MR,Hunt T,Forbes SJ. Minichromosome maintenance (MCM) proteins may be pre-cancer markersGut 2002;50:290–291. [pmid: 11839701]
Barnes L,Eveson JW,Reichart P,Sidransky D. World Health Organization Classification of Tumours: Pathology and Genetics of Head and Neck Tumours. 2005IARC Press: Lyon;
Chatrath P,Scott IS,Morris LS,Davies RJ,Rushbrook SM,Bird K,Vowler SL,Grant JW,Saeed IT,Howard D,Laskey RA,Coleman N. Aberrant expression of minichromosome maintenance protein-2 and Ki67 in laryngeal squamous epithelial lesionsBr J Cancer 2006;89:1048–1054. [pmid: 12966424]
Diaz EM Jr,Holsinger FC,Zuniga ER,Roberts DB,Sorensen DM. Squamous cell carcinoma of the buccal mucosa: one institution's experience with 119 previously untreated patientsHead Neck 2003;25:267–273. [pmid: 12658730]
Dudderidge TJ,Stoeber K,Loddo M,Atkinson G,Fanshawe T,Griffiths DF,Williams GH. Mcm2, geminin, and KI67 define proliferative state and are prognostic markers in renal cell carcinomaClin Cancer Res 2005;11:2510–2517. [pmid: 15814627]
Eward KL,Obermann E,Shreeman S,Loddo M,Fanshawe T,Williams C,Jung H,Prevost T,Blow JJ,Stoeber K,Williams GH. DNA replication licensing in somatic and germ cellsJ Cell Sci 2004;117:5875–5886. [pmid: 15522891]
Freeman A,Morris LS,Mills AD,Stoeber K,Laskey RA,Williams GH,Coleman N. Minichromosome maintenance proteins as biological markers of dysplasia and malignancyClin Cancer Res 1999;5:2121–2132. [pmid: 10473096]
Gerdes J,Lemke H,Baisch H,Wacker HH,Schwab U,Stein H. Cell cycle analysis of a cell proliferation-associated nuclear antigen defined by the monoclonal antibody Ki-67J Immunol 1984;133:1710–1715. [pmid: 6206131]
Going JJ,Keith WN,Neilson L,Stoeber K,Stuart RC,Williams GH. Aberrant expression of minichromosome maintenance proteins 2 and 5, and Ki-67 in dysplastic squamous oesophageal epithelium and Barret's mucosaGut 2002;50:373–377. [pmid: 11839717]
Gonzalez MA,Tachibana KK,Chin S,Callagy G,Madine MA,Vowler SL,Pinder SE,Laskey RA,Coleman N. Geminin predicts adverse clinical outcome in breast cancer by reflecting cell-cycle progressionJ Pathol 2004;204:121–130. [pmid: 15376260]
Ibarra A,Schwob E,Mendez J. Excess MCM proteins protect human cells from replicative stress by licensing backup origins of replicationProc Natl Acad Sci 2008;105:8956–8961.
Kearsey SE,Labib K. MCM proteins: evolution, properties and role in DNA replicationBiochem Biophys Acta 1998;1398:113–1136.
Kingsbury SR,Loddo M,Fanshawe T,Obermann EC,Prevost AT,Stoeber K,Williams GH. Repression of DNA replication licensing in quiescence is independent of geminin and may define the cell cycle state of progenitor cellsExp Cell Res 2005;309:56–67. [pmid: 16005865]
Kodani I,Osaki M,Shomori K,Araki K,Goto E,Ryoke K,Ito H. Minichromosome maintenance 2 expression is correlated with mode of invasion and prognosis in oral squamous cell carcinomasJ Oral Pathol Med 2003;32:468–474. [pmid: 12901728]
Kodani I,Shomori K,Osaki M,Kuratate I,Ryoke K,Ito H. Expression of minichromosome maintenance 2 (Mcm2), Ki67, and cell-cycle-related molecules, and apoptosis in the normal-dysplasia-carcinoma sequence of the oral mucosaPathobiology 2001;69:150–158. [pmid: 11872961]
Lea NC,Orr SJ,Stoeber K,Williams GH,Lam E,Ibrahim MAA,Mufti GJ,Thomas NSB. Commitment point during G0–G1 phase that controls entry into the cell cycleMol Cell Biol 2003;23:2351–2361. [pmid: 12640120]
McGarry TJ,Kirschner MW. Geminin an inhibitor of DNA replication is degraded during mitosisCell 1998;93:1043–1053. [pmid: 9635433]
Meng MV,Grossfeld GD,Williams GH,Dilworth S,Stoeber K,Mulley TW,Weinberg V,Carroll PR,Tisty TD. Minichromosome maintenance protein 2 expression in prostate: characterization and association with outcome after therapy for cancerClin Cancer Res 2001;7:2712–2718. [pmid: 11555583]
Mork J. Forty years of monitoring head and neck cancer in Norway – no good newsAnticancer Res 1998;18:3705–3708. [pmid: 9854481]
Napier SS,Speight PM. Natural history of potentially malignant oral lesions and conditions: an overview of the literatureJ Oral Pathol Med 2008;37:1–10. [pmid: 18154571]
Quaglia A,McStay M,Stoeber K,Loddo M,Caplin M,Fanshawe T,Williams G,Dhillon A. Novel markers of cell kinetics to evaluate progression from cirrhosis to hepatocellular carcinomaLiver Int 2006;26:424–432. [pmid: 16629645]
Scott IS,Odell E,Chatrath P,Morris LS,Davies SL,Vowler SM,Laskey RA,Coleman N. A minimally invasive immunocytochemical approach to early detection of oral squamous cell carcinoma in dysplasiaBr J Cancer 2006;94:1170–1175. [pmid: 16622441]
Shetty A,Loddo M,Fanshawe T,Prevost AT,Sainsbury R,Williams GH,Stoeber K. DNA replication licensing and cell cycle kinetics of normal and neoplastic breastBr J Cancer 2005;93:1295–1300. [pmid: 16278669]
Stoeber K,Halsall I,Freeman I,Swinn R,Doble A,Morris L,Coleman N,Bullock N,Laskey RA,Hales CN,Williams GH. Immunoassay for urothelial cancers that detects DNA replication protein Mcm5 in urineLancet 1999;354:1524–1525. [pmid: 10551502]
Tachibana KK,Gonzalez MA,Coleman N. Cell-cycle-dependent regulation of DNA replication and its relevance to cancer pathologyJ Pathol 2005;205:123–129. [pmid: 15643673]
Takeda T,Sugihara K,Hirayama Y,Hirano M,Tanuma JI,Semba I. Immunohistological evaluation of Ki67, p63, CK19 and p53 expression in oral epithelial dysplasiasJ Oral Pathol Med 2006;35:369–375. [pmid: 16762018]
Todorov IT,Pepperkok R,Philipova RN,Kearsey SE,Ansorge W,Werner D. A human nuclear protein with sequence homology to a family of early S phase proteins is required for entry into S phase and for cell divisionJ Cell Sci 1994;107:253–268. [pmid: 8175912]
Wharton SB,Chan KK,Anderson JR,Stoeber K,Williams GH. Replicative Mcm2 protein as a novel proliferation marker in oligodendrogliomas and its relationship to Ki-67 labelling index, histological grade and prognosisNeuropathol Appl Neurobiol 2001;27:305–313. [pmid: 11532161]
Wharton SB,Hibberd S,Eward KL,Crimmins D,Stoeber K,Williams GH. DNA replication licensing and cell cycle kinetics of oligodendroglial tumoursBr J Cancer 2004;91:262–269. [pmid: 15199392]
Williams GH,Romanowski P,Morris L,Madine M,Mills AD,Stoeber K,Marr J,Laskey RA,Coleman N. Improved cervical smear assessment using antibodies against proteins that regulate DNA replicationProc Natl Acad Sci 1998;95:14932–14937.
Williams GH,Swinn R,Prevost AT,de Clive-Lowe P,Halsall A,Going JJ,Hales CN,Stoeber K,Middleton SJ. Diagnosis of oesophageal cancer by detection of minichromosome maintenance 5 protein in gastric aspiratesBr J Cancer 2004;91:714–719. [pmid: 15266314]
Wohlschlegel JA,Kutok JL,Weng AP,Dutta A. Expression of geminin as a marker of cell proliferation in normal tissues and malignanciesAm J Pathol 2002;161:267–273. [pmid: 12107111]
Xouri G,Lygerou Z,Nishitani H,Pachnis V,Nurse P,Taviras S. Cdt1 and geminin are down-regulates upon cell cycle exit and are over-expressed in cancer-derived cell linesEur J Biochem 2004;271:3368–3378. [pmid: 15291814]

Article Categories:
  • Molecular Diagnostics

Keywords: oral cancer, dysplasia, Mcm2 protein, geminin protein, cell-cycle proteins.

Previous Document:  Incidence and predictors of treatment-related mortality in paediatric acute leukaemia in El Salvador...
Next Document:  Homozygous CDA*3 is a major cause of life-threatening toxicities in gemcitabine-treated Japanese can...