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  1. Article ; Online: Comprehensive insights into the understanding of hypoxia in ameloblastoma.

    Bologna-Molina, Ronell / Schuch, Lauren / Niklander, Sven Eric

    Histology and histopathology

    2024  , Page(s) 18718

    Abstract: Hypoxia is characterized by a disparity between supply and demand of oxygen. The association between hypoxia and head and neck tumors is a topic of significant interest. Tumors frequently encounter areas with inadequate oxygen supply, resulting in a ... ...

    Abstract Hypoxia is characterized by a disparity between supply and demand of oxygen. The association between hypoxia and head and neck tumors is a topic of significant interest. Tumors frequently encounter areas with inadequate oxygen supply, resulting in a hypoxic microenvironment. Ameloblastoma is one of the most common benign odontogenic tumors of the maxillofacial region. It is a slow-growing but locally invasive tumor with a high recurrence rate. The literature has demonstrated the correlation between hypoxia and ameloblastoma, revealing a discernible link between the heightened expression of hypoxic markers in low oxygen conditions. This association is intricately tied to the tumoral potential for invasion, progression, and malignant transformation. Hypoxia profoundly influences the molecular and cellular landscape within ameloblastic lesions. The present review sheds light on the mechanisms, implications, and emerging perspectives in understanding this intriguing association to clarify the dynamic relationship between hypoxia and ameloblastoma.
    Language English
    Publishing date 2024-02-01
    Publishing country Spain
    Document type Journal Article ; Review
    ZDB-ID 83911-5
    ISSN 1699-5848 ; 0213-3911
    ISSN (online) 1699-5848
    ISSN 0213-3911
    DOI 10.14670/HH-18-718
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Classificatory updates in verrucous and cuniculatum carcinomas: Insights from the 5

    Silveira, Felipe Martins / Schuch, Lauren Frenzel / Bologna-Molina, Ronell

    World journal of clinical oncology

    2024  Volume 15, Issue 4, Page(s) 464–467

    Abstract: The International Agency for Research on Cancer (IARC) and World Health Organization (WHO) collaboratively produce the 'WHO Blue Books' essential tools standardizing the diagnostic process for human cancers. Regular updates in this classification ... ...

    Abstract The International Agency for Research on Cancer (IARC) and World Health Organization (WHO) collaboratively produce the 'WHO Blue Books' essential tools standardizing the diagnostic process for human cancers. Regular updates in this classification accommodate emerging molecular discoveries, advances in immunohistochemical techniques, and evolving clinical insights. The 5
    Language English
    Publishing date 2024-04-03
    Publishing country United States
    Document type Editorial
    ZDB-ID 2587357-X
    ISSN 2218-4333
    ISSN 2218-4333
    DOI 10.5306/wjco.v15.i4.464
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: The value of Phosphohistone H3 as a cell proliferation marker in oral squamous cell carcinoma. A comparative study with Ki-67 and the mitotic activity index.

    Tancredi-Cueto, N / Vigil-Bastitta, G / Bologna-Molina, R / Beovide-Cortegoso, V

    Medicina oral, patologia oral y cirugia bucal

    2022  Volume 27, Issue 5, Page(s) e444–e451

    Abstract: Background: The Phosphohistone H3 (PHH3) antibody is recognized as a biomarker of cell proliferation, specific for cells in mitosis, of prognostic value in different malignant neoplasms, however it has been poorly studied in oral squamous cell carcinoma ...

    Abstract Background: The Phosphohistone H3 (PHH3) antibody is recognized as a biomarker of cell proliferation, specific for cells in mitosis, of prognostic value in different malignant neoplasms, however it has been poorly studied in oral squamous cell carcinoma (OSCC). The main objective of this study was to evaluate the immunoexpression of the PHH3 in the OSCC, through the correlation with the immunoexpression of Ki-67, the mitotic activity index (MAI), histological grading, clinical-morphological parameters and the rate of survival.
    Material and methods: The study sample consisted of 62 cases of OSCC diagnosed in the Pathological Anatomy Laboratory of the Faculty of Dentistry, University of the Republic (Uruguay). In each of them, an immunohistochemical technique was performed for Ki-67 and PHH3 (serine 10) antibodies. Image J software was used for the MAI and biomarker quantification, defining the percentage of positivity and mitotic figures per 1000 tumor cells.
    Results: a significant association was obtained between the expression of PHH3 (p 0.016) and MAI (p 0.031) with survival time. However, no similar relationship was found with Ki-67 (p 0.295). Although it was confirmed a statistical association between histological grade and Ki-67 immunoexpression (p 0.004), PHH3 did not show a similar relationship (p 0.564).
    Conclusions: It was confirmed the role of the PHH3 antibody as a biomarker of mitotic figures in OSCC and as a potential marker of cell proliferation. It is noteworthy that this is one of the first works that evaluates a possible relationship between the expression of this antibody and survival in OSCC.
    MeSH term(s) Biomarkers, Tumor ; Carcinoma, Squamous Cell ; Cell Proliferation ; Head and Neck Neoplasms ; Histones/metabolism ; Humans ; Immunohistochemistry ; Ki-67 Antigen ; Mouth Neoplasms ; Phosphorylation ; Prognosis ; Squamous Cell Carcinoma of Head and Neck
    Chemical Substances Biomarkers, Tumor ; Histones ; Ki-67 Antigen
    Language English
    Publishing date 2022-09-01
    Publishing country Spain
    Document type Journal Article
    ZDB-ID 2171573-7
    ISSN 1698-6946 ; 1698-4447
    ISSN (online) 1698-6946
    ISSN 1698-4447
    DOI 10.4317/medoral.25420
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Stafne's bone defect: a systematic review.

    Soares, A / Ferreira, L / Calderipe, C / Bologna-Molina, R / Damian, M / Martins, M / Silveira, F / Vasconcelos, A-C

    Medicina oral, patologia oral y cirugia bucal

    2023  Volume 28, Issue 3, Page(s) e264–e271

    Abstract: Background: This systematic review integrated the available data published in the literature on Stafne's bone defect (SBD), considering the clinical, imaging and histopathological results.: Material and methods: An electronic search was undertaken in ...

    Abstract Background: This systematic review integrated the available data published in the literature on Stafne's bone defect (SBD), considering the clinical, imaging and histopathological results.
    Material and methods: An electronic search was undertaken in six databases. Eligibility criteria were: articles in English, Spanish, and Portuguese describing case reports or case series of SBD, reported up to September/2021. Risk of bias was assessed using the Joanna Briggs Institute tool.
    Results: A total of 98 articles were retrieved, involving 465 individuals with SBD and were included for quantitative analysis. Mean age was 52.78 years (range: 11-89 years), with male predilection (n=374/80.85%). Radiographs were the most frequent imagiological exams (n=298/64.09%), followed by computed tomography (n=98/21.08%). SBD was more prevalent in the posterior mandible (n=361/93.77%) as a hypodense radiolucent lesion (n=250/77.40%). Mean size was 1.58 cm (range: 0.3-.8.0 cm). Two-hundred-and-two lesions (97.37%) were unilocular and 126 (91.97%) were classified as well-defined. Clinical symptoms were reported in 73 cases, while 68 cases (93.15%) were asymptomatic. Only 34 cases (12.32%) were submitted to histopathological examination. Mean follow-up time was 26.42 ±25.39 months.
    Conclusions: SBD is more frequent in male patients in the fifth and sixth decade of life. Classic SBD is radiographically characterized as a single, unilocular and well-defined lesion in the posterior region of the jaw with a radiolucent/hypodense appearance.
    MeSH term(s) Humans ; Male ; Middle Aged ; Jaw Cysts ; Mandibular Diseases ; Radiography, Panoramic ; Mandible/pathology ; Tomography, X-Ray Computed
    Language English
    Publishing date 2023-05-01
    Publishing country Spain
    Document type Systematic Review ; Journal Article
    ZDB-ID 2171573-7
    ISSN 1698-6946 ; 1698-4447
    ISSN (online) 1698-6946
    ISSN 1698-4447
    DOI 10.4317/medoral.25676
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Editorial: Fluoride exposure, dental fluorosis, and health.

    González-González, Rogelio / Bologna-Molina, Ronell / Molina-Frechero, Nelly

    Frontiers in oral health

    2023  Volume 4, Page(s) 1256495

    Language English
    Publishing date 2023-08-03
    Publishing country Switzerland
    Document type Editorial
    ISSN 2673-4842
    ISSN (online) 2673-4842
    DOI 10.3389/froh.2023.1256495
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Frequency of BRAF V600E immunoexpression in ameloblastomas: a multi-institutional analysis of 86 cases in Latin America and comprehensive review of the literature.

    Silveira, F-M / Schuch, L-F / Pereira-Prado, V / Sicco, E / Almeda-Ojeda, O / Molina-Frechero, N / Paparella, M-L / Villarroel-Dorrego, M / Hernadez, M / Bologna-Molina, R

    Medicina oral, patologia oral y cirugia bucal

    2024  

    Abstract: Background: The initiation of odontogenic tumorigenesis often involves the activation of the MAP-kinase pathway, with a pivotal role played by the BRAF V600E mutation. This study aimed to investigate the frequency of BRAF V600E immunoexpresion in ... ...

    Abstract Background: The initiation of odontogenic tumorigenesis often involves the activation of the MAP-kinase pathway, with a pivotal role played by the BRAF V600E mutation. This study aimed to investigate the frequency of BRAF V600E immunoexpresion in ameloblastomas diagnosed in four Latin American centers and correlate this finding with the histological types and subtypes of the analyzed cases.
    Material and methods: A total of 86 samples of ameloblastomas were examined for immunohistochemistry using anti-BRAF V600E antibody. The histopathological features of each case were analyzed.
    Results:  Positivity for anti-BRAF V600E antibody was detected in 65/86 cases (75.6%). BRAF V600E was positive in 38/56 cases (67.9%) of conventional ameloblastomas and in 27/30 cases (90.0%) of unicystic ameloblastomas. A statistically significant difference in BRAF V600E positivity was observed when comparing unicystic ameloblastomas to conventional ameloblastomas (p=0.03). No statistically significant difference in BRAF V600E positivity was observed when comparing histological variants, both for conventional ameloblastomas and unicystic ameloblastomas.
    Conclusions: This study highlights a high frequency of BRAF V600E immunoreactivity in ameloblastomas among Latin American cases. The prevalence of the BRAF V600E immunoexpresion may suggest the feasibility of utilizing BRAF-targeted therapy for ameloblastomas with this mutation.
    Language English
    Publishing date 2024-04-14
    Publishing country Spain
    Document type Journal Article
    ZDB-ID 2171573-7
    ISSN 1698-6946 ; 1698-4447
    ISSN (online) 1698-6946
    ISSN 1698-4447
    DOI 10.4317/medoral.26493
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Connexin 43, Bcl-2, Bax, Ki67, and E-cadherin patterns in oral squamous cell carcinoma and its relationship with GJA1 rs12197797 C/G.

    Segura, I-G / Secchi, D-G / Galíndez, M-F / Carrica, A / Bologna-Molina, R / Brunotto, M / Centeno, V-A

    Medicina oral, patologia oral y cirugia bucal

    2022  Volume 27, Issue 4, Page(s) e366–e374

    Abstract: Background: To our knowledge, there is no useful and accurate prognostic biomarker or biomarkers for patients with oral squamous cell carcinoma (OSCC), a tumor with uncertain biological behavior, and unpredictable clinical progress. The purposes of this ...

    Abstract Background: To our knowledge, there is no useful and accurate prognostic biomarker or biomarkers for patients with oral squamous cell carcinoma (OSCC), a tumor with uncertain biological behavior, and unpredictable clinical progress. The purposes of this study were: a) to determine the expresión profile of Connexin 43, Bcl-2, Bax, E-cadherin, and Ki67 in patients with OSCC; b) identify the GJCA1 rs12197797 genotypic composition.
    Material and methods: A cross-sectional study using genomic DNA and biopsy samples extracted from the oral mucosa with/without OSCC, older than 18 years, both genders, attended at Facultad de Odontología, Universidad Nacional Córdoba. Immunostaining for Cx43, Bcl-2, Bax, E-cadherin, and Ki67 and genotyping GJA1 rs12197797 by RFLP were performed. Odds Ratio (95% CI), Spearman Coefficient were estimated. Mann-Whitney test was applied to analyze immunostaining between controls/cases (p <0.05 was set for statistical significance).
    Results: GG (mutant) was the most frequent genotype in patients with OSCC diagnosis (53.2%) in relation to CC "healthy" genotype (p=0.00487; OR=7.33; CI95% [1.1-54.7]). And, the allele G (mutant) had a presence in 75.5% of OSCC patients. However, no significant association was observed between alleles C/G and diagnosis (p=0.0565). The heterozygous genotype was the most frequent in the patients of both groups Cx43 and E-cadherin markers were lower in OSCCs in relation to controls. Ki67 and Bcl-2 immunolabeling were high on OSCC, and Bax immunomarker was diminished in OSCC.
    Conclusions: We hypothesized that the oral epithelium losses Connexin 43 and E-cadherin in the membrane, which modifies cell differentiation. The Ki67 and Bcl2 overexpression would increase the cell density in the tissue, by promoting proliferation and decreasing apoptosis. And, this study shows evidence that patients who carry on allele G of GJA1rs12197797 could be at risk of developing OSCC.
    MeSH term(s) Biomarkers, Tumor/genetics ; Cadherins/genetics ; Carcinoma, Squamous Cell/pathology ; Connexin 43/genetics ; Cross-Sectional Studies ; Female ; Head and Neck Neoplasms ; Humans ; Ki-67 Antigen ; Male ; Mouth Neoplasms/pathology ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Squamous Cell Carcinoma of Head and Neck ; bcl-2-Associated X Protein
    Chemical Substances BCL2 protein, human ; Biomarkers, Tumor ; Cadherins ; Connexin 43 ; GJA1 protein, human ; Ki-67 Antigen ; Proto-Oncogene Proteins c-bcl-2 ; bcl-2-Associated X Protein
    Language English
    Publishing date 2022-07-01
    Publishing country Spain
    Document type Journal Article
    ZDB-ID 2171573-7
    ISSN 1698-6946 ; 1698-4447
    ISSN (online) 1698-6946
    ISSN 1698-4447
    DOI 10.4317/medoral.25298
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Correlation of Bony Invasion With Nodal Metastasis, Pattern of Invasion and Survival in Oral Squamous Cell Carcinoma: A Retrospective Analysis of 122 Primary Cases From Oral Cancer Centre of South India.

    Ramasubramanian, Swetha / Pandiar, Deepak / Krishnan, Reshma P / Ramalingam, Karthikeyan / Bologna-Molina, Ronell

    Cureus

    2023  Volume 15, Issue 8, Page(s) e42887

    Abstract: Background Oral squamous cell carcinoma (OSCC) is considered to be the most common epithelial malignant neoplasm of the oral cavity. Despite advancements in diagnosis and therapeutics the clinical outcome of the disease has not improved much which may be ...

    Abstract Background Oral squamous cell carcinoma (OSCC) is considered to be the most common epithelial malignant neoplasm of the oral cavity. Despite advancements in diagnosis and therapeutics the clinical outcome of the disease has not improved much which may be attributed to tumor biology and heterogeneity. Bone invasion by cancer cells is currently staged as a moderately advanced disease. However, many low-grade carcinomas such as verrucous carcinoma and carcinoma cuniculatum show body invasion but less nodal metastases and better overall survival. The present study was orchestrated to analyze if bone invasion in OSCC has any impact on regional nodal metastases and survival. Materials and methods A total of 122 cases of OSCC who underwent excision and neck dissection were retrieved and included. These cases were then divided into two study groups. Group I comprised 56 OSCC cases with bone involvement and 66 cases with no bony involvement. The bone invasion was correlated with nodal metastases, survival and pattern of invasion. Statistical analysis was done using SPSS software (IBM Corp., Armonk, NY, USA). Results There was no statistically significant correlation between bone invasion with either nodal metastases or pattern of invasion, however, the worst pattern of invasion (WPOI)-4,5 showed a statistically higher incidence of nodal involvement in OSCC. No statistical difference was noted in overall survival between the two groups. Conclusion The worst pattern of invasion and not bone involvement, depicts nodal metastases in OSCC and thus, deserves consideration while staging and treatment planning.
    Language English
    Publishing date 2023-08-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2747273-5
    ISSN 2168-8184
    ISSN 2168-8184
    DOI 10.7759/cureus.42887
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Mixed odontogenic tumors: A review of the clinicopathological and molecular features and changes in the WHO classification.

    Sánchez-Romero, Celeste / Paes de Almeida, Oslei / Bologna-Molina, Ronell

    World journal of clinical oncology

    2022  Volume 12, Issue 12, Page(s) 1227–1243

    Abstract: Background: Ameloblastic fibromas and ameloblastic fibrosarcomas are rare odontogenic tumors, and controversy exists in the classification of cases presenting hard-tissue production: Ameloblastic fibrodentinoma (AFD) and ameloblastic fibro-odontoma (AFO) ...

    Abstract Background: Ameloblastic fibromas and ameloblastic fibrosarcomas are rare odontogenic tumors, and controversy exists in the classification of cases presenting hard-tissue production: Ameloblastic fibrodentinoma (AFD) and ameloblastic fibro-odontoma (AFO). These cases are currently considered "developing odontomas" (hamartomatous lesions).
    Aim: To analyze the clinicopathologic features of these lesions and discuss the changes in the 2017 World Health Organization classification.
    Methods: An electronic literature search was performed in the PubMed/MEDLINE database. An electronic search of the English language literature was performed and last updated in September 2020 in the PubMed/MEDLINE database using the following terms: "ameloblastic fibroma", "ameloblastic fibrodentinoma", "ameloblastic fibro-odontoma", "ameloblastic sarcoma", "ameloblastic fibrosarcoma", "ameloblastic fibrodentinosarcoma", "ameloblastic fibroodontosarcoma" and "odontogenic carcinosarcoma". The inclusion criteria were odontogenic tumor series, case reports and systematic reviews that provided sufficient clinical, radiological and microscopic documentation to confirm the diagnosis.
    Results: The database search strategy resulted in 947 papers. Articles focusing on other topics, articles that were not in English, duplicate articles, and articles without fulfilling the inclusion criteria were excluded. Finally, 96 publications were included in this review to describe and discuss the main features of the searched entities. Several aspects of AFO and AFD, such as biological behavior, age of occurrence, amount of hard tissue, and potential for malignant transformation into odontogenic sarcomas, support the neoplastic nature in most of the reported cases. Considering the clinical, radiographic, histopathological and molecular characteristics of odontogenic lesions with hard tissue production, we suggest that these types of lesions should continue to be recognized as odontogenic tumors by maintaining the classically used terms.
    Conclusion: This recommendation will be relevant for future clinical, microscopic, and molecular studies to better understand the biology of these interesting odontogenic tumors.
    Language English
    Publishing date 2022-01-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2587357-X
    ISSN 2218-4333
    ISSN 2218-4333
    DOI 10.5306/wjco.v12.i12.1227
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: DNA oxidative damage in oral cancer: 8-hydroxy-2´-deoxyguanosine immunoexpression assessment.

    Prieto-Correa, J-R / Bologna-Molina, R / González-González, R / Molina-Frechero, N / Soto-Ávila, J-J / Isiordia-Espinoza, M / Márquez, M-C / Verdín, S-L

    Medicina oral, patologia oral y cirugia bucal

    2023  Volume 28, Issue 6, Page(s) e530–e538

    Abstract: Background: The development and establishment of oral squamous cell carcinoma are confined to carcinogenesis, which involves oxidative stress via oxygen-free radical production as a hydroxyl radical (HO•), considered the most important cause of ... ...

    Abstract Background: The development and establishment of oral squamous cell carcinoma are confined to carcinogenesis, which involves oxidative stress via oxygen-free radical production as a hydroxyl radical (HO•), considered the most important cause of oxidative damage to basic biomolecules since it targets DNA strands. 8-Hydroxy-2´-deoxyguanosine (8-OHdG) is considered a free radical with a promutagenic capacity due to its ability to pair with adenosine instead of cytosine during replication.
    Material and methods: We collected 30 paraffin-embedded tissue samples of OSCC from patients treated between 2013 and 2018. We recorded risk habits, disease stage, disease free survival and death with at least 3 years of follow-up. 8-Hydroxyguanosine was evaluated by immunohistochemistry and subsequently classified as weak-moderate or strong positive expression. Additionally, we noted whether it was expressed in the cytoplasm and/or nucleus.
    Results: Most of the cases expressed 8-OHdG with a strong intensity (80%). All neoplastic cells were preferentially stained in only the cytoplasm (70.0%), but nuclear positivity was found in 30%, independent of the intensity. Based on the location in the cytoplasm and/or nucleus, tumors >4 cm showed a high frequency (95.5%) of 8-OHdG expression in only the cytoplasm, with a significant difference (p value 0.001). Additionally, overall survival was affected when immunoexpression was present in the cytoplasm and nucleus because all deaths were in this group were statistically significant (p value = 0.001).
    Conclusions: All tumors showed DNA oxidative damage, and 8-OHdG was preferentially expressed in the cytoplasm. This finding was associated with tumor size and, when present in the nucleus, might also be related to death.
    MeSH term(s) Humans ; 8-Hydroxy-2'-Deoxyguanosine/metabolism ; Mouth Neoplasms ; Deoxyguanosine/chemistry ; Deoxyguanosine/metabolism ; Carcinoma, Squamous Cell ; DNA Damage ; Oxidative Stress ; Free Radicals
    Chemical Substances 8-Hydroxy-2'-Deoxyguanosine (88847-89-6) ; Deoxyguanosine (G9481N71RO) ; Free Radicals
    Language English
    Publishing date 2023-11-01
    Publishing country Spain
    Document type Journal Article
    ZDB-ID 2171573-7
    ISSN 1698-6946 ; 1698-4447
    ISSN (online) 1698-6946
    ISSN 1698-4447
    DOI 10.4317/medoral.25924
    Database MEDical Literature Analysis and Retrieval System OnLINE

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