Líquen Plano Oral e seu Potencial de Malignização / Lichen Planus and its potencial for malignancy

Objetivos: Instruir e orientar ao cirurgião dentista e demais profissionais de saúde a importância da detecção e rastreio precoce de lesões pré-malignas. Revisão de Literatura: O Líquen Plano Oral é uma condição dermatológica crônica, de origem auto-imune, relativamente comum na população, que atinge o epitélio de mucosa e pele, sendo considerada, pela Organização Mundial de Saúde (OMS), uma desordem potencialmente maligna quando associado a áreas de ulceração. A revisão de literatura foi realizada nas bases de dados PubMed e Lilacs. Buscamos investigar o potencial de malignização do Líquen Plano Oral associado a condições erosivas, analisando o processo de carcinogênese no processo inflamatório. Conclusão: Conclui-se que o objeto de estudo ainda é um assunto pouco explorado pela literatura, porém há indícios etiopatológicos que enfatizam o processo de malignização oriundo de uma lesão pré-maligna como o Líquen Plano Oral. Além disso, enfatizamos a importância do diagnóstico precoce das lesões estomatognáticas, para que assim possamos aumentar as chances de cura do paciente.(AU)

Objectives: To instruct and guide dentists and other health professionals on the importance of early detection and screening of pre-malignant lesions. Literature Review: Oral Lichen Planus is a chronic dermatological condition, of autoimmune origin, relatively common in the population, which affects the epithelium of the mucosa and skin, being considered, by the World Health Organization (WHO), a potentially fatal disorder. malignant when associated with areas of ulceration. A literature review was performed on the PubMed and Lilacs databases. We sought to investigate the potential for malignancy of Oral Lichen Planus associated with erosive conditions, analyzing the process of carcinogenesis in the inflammatory process. Conclusion: It is concluded that the object of study is still a subject little explored in the literature, but there are etiopathological accusations that emphasize the process of malignancy arising from a pre-malignant lesion such as Oral Lichen Planus. In addition, we emphasize the importance of early diagnosis of stomatognathic lesions, so that we can increase the patient's chances of cure.(AU)

Pineocytoma with malignant transformation to pineal parenchymal tumor with intermediate differentiation and leptomeningeal dissemination after subtotal tumor resection and adjuvant radiotherapy

Pineocytoma is a rare tumor. It is rare for pineocytoma to present as leptomeningeal metastasis. We present a rare case of pineocytoma with malignant transformation and leptomeningeal metastasis after subtotal tumor resection and adjuvant radiotherapy. This case was a 58-year-old male with an unsteady gait for 2 months. Enhanced brain magnetic resonance imaging revealed a heterogeneous mass involving the pineal region. The initial pathological diagnosis of pineocytoma was confirmed after subtotal tumor resection. Two years after adjuvant radiotherapy to the primary site, the magnetic resonance imaging showed C2 and T2 metastatic lesions, with the final pathological diagnosis being pineal parenchymal tumor (PPT) with intermediate differentiation after the removal of T2 intramedullary tumor. After that adjuvant radiotherapy at the cervical and thoracic spinal cord was completed. There was no recurrence of the tumor 1 year after the radiotherapy. We report a rare case of pineocytoma with malignant transformation to PPT with intermediate differentiation and leptomeningeal dissemination.

Co-expression of circRNA in oral leukoplakia and oral lichen planus / 口腔疾病防治

Objective@# To find any differentially expressed circRNAs in oral leukoplakia (OLK) and oral lichen planus (OLP), to investigate the possible role of circRNAs in the pathogenesis of these two diseases.@*Methods@# This study obtained hospital ethical approval. High-throughput sequencing was used to detect differentially expressed circRNAs in OLK, OLP, oral squamous cell carcinoma and normal oral mucosal tissues. CircRNAs were verified by qRT-PCR, enzyme tolerance assays and Sanger sequencing. GO functional analysis and KEGG pathway analysis were performed to predict the functions of circRNAs in OLP. TargetScan and miRanda were applied to predict targeted miRNAs and mRNAs of circRNAs, and ceRNA networks were mapped. @*Results@#A total of 49 circRNAs were differentially expressed in OLK and OLP together, including 30 upregulated and 19 downregulated circRNAs. The five circRNAs confirmed with RT-qPCR, including circHLA-C, circRNF13, circTTN, circSEPN2 and circALDH3A2, were all abnormally expressed in OLK and OLP, among which circHLA-C was a key circRNA with trans splice sites, which was validated by expanding the sample size. ROC curve analysis showed that the area under the circHLA-C curve for predicting OLK was 0.955, and the area under the circHLA-C curve for predicting OLP was 0.988. GO functional analysis showed enrichment of many biological processes related to the immune process. The KEGG pathway with the highest enrichment score was "Natural killer cell mediated cytotoxicity". HLA-C was significantly enriched in these processes/pathways. CeRNA network analysis showed that circHLA-C interacted with a variety of miRNAs, such as hsa-miR-26a-5p, hsa-miR-129-5p, and hsa-miR-29a-3p.@*Conclusion@#Many circRNAs were differentially expressed in both OLK and OLP, circHLA-C being the most elevated. CircHLA-C is valuable for the early diagnosis of OLK and OLP and may serve as a potential biomarker for the diagnosis and prognosis of OLK and OLP.

Risk factors of recurrence and canceration for premalignant vocal fold lesions after surgery / 临床耳鼻咽喉头颈外科杂志

Objective:To analyze the risk factors of recurrence and canceration for premalignant vocal fold lesions after surgery, and to provide a reasonable basis for preoperative evaluation and postoperative follow-up. Methods:This study retrospective analyzed the relationship between clinicopathological factors and clinical outcome（recurrence, canceration, recurrence-free survival, and canceration-free survival） in 148 patients undergoing surgical treatment in Chongqing General Hospital from 2014 to 2017. Results:The five-year overall recurrence rate was 14.86% and the overall recurrence rate was 8.78%. Univariate analysis showed that smoking index, laryngopharyngeal reflux and lesion range were significantly associated with recurrence（P<0.05）, and smoking index and lesion range were significantly associated with canceration（P<0.05）. Multivariate logistic regression analysis showed that smoking index ≥600 and laryngopharyngeal reflux were independent risk factors for recurrence（P<0.05）, and smoking index ≥600 and lesion range ≥1/2 vocal cord were independent risk factors for canceration（P<0.05）. The mean carcinogenesis interval for the postoperative smoking cessation group was significantly longer（P<0.05）. Conclusion:Excessive smoking, laryngopharyngeal reflux and a wide range of lesions may be related to postoperative recurrence or malignant progression of precancerous lesions in the vocal cord, and further large-scale multi-center prospective randomized controlled studies are needed to clarify the effects of the above factors on recurrence and malignant changes in the future.

Biomarkers of malignant transformation in oral leukoplakia: from bench to bedside / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

Oral leukoplakia is a common precursor lesion of oral squamous cell carcinoma, which indicates a high potential of malignancy. The malignant transformation of oral leukoplakia seriously affects patient survival and quality of life; however, it is difficult to identify oral leukoplakia patients who will develop carcinoma because no biomarker exists to predict malignant transformation for effective clinical management. As a major problem in the field of head and neck pathologies, it is imperative to identify biomarkers of malignant transformation in oral leukoplakia. In this review, we discuss the potential biomarkers of malignant transformation reported in the literature and explore the translational probabilities from bench to bedside. Although no single biomarker has yet been applied in the clinical setting, profiling for genomic instability might be a promising adjunct.

Basal cell carcinoma arising on two variants of epidermal nevus: A case series

Introduction@#Epidermal nevi are hamartomas of the epidermis and papillary dermis that are usually present during the first years of life. Rarely, malignant transformations develop in association with epidermal nevi. Few cases have been reported worldwide, however the lifetime risk and incidence are unknown. @*Case Report@#This is a case series about basal cell carcinoma arising on epidermal nevus. The first patient is a 42-year-old Filipino female, who presented with a verrucous plaque at birth on the left temple which then developed multiple, discrete to confluent, grayish, papules and nodules on the surface. Histological examination revealed nevus sebaceus and basal cell carcinoma, pigmented type. The second patient is a 53-year-old Filipino male, who presented with a papillomatous plaque on the left temple since the first year of life which then increased in size along with the presence of a solitary bluish-black macule noted by dermoscopic examination. Histologic examination showed verrucous epidermal nevus and basal cell carcinoma, pigmented type.@*Conclusion@#Two rare cases of basal cell carcinoma arising on epidermal nevus are reported. Despite the rarity of malignant transformation on epidermal nevus, any suspicious growth warrants a biopsy. Knowledge of these cases is important for probing suspicious growth over an epidermal nevus that would prompt early treatment before these lesions progress in size making it harder to manage.

High grade spindle cell carcinoma of the ovary arising in an endometrioid cystadenoma: A case report

@#Spindle Cell Carcinoma of the Ovary is arate form of cancer with controversial histogenesis. It shares the histologic, cytologic, and molecular properties of both epithelial and mesenchymal differentiation of ovarian neoplasms, which makes diagnosis very challenging among pathologists. Endometrioid cystadenoma is a benign ovarian neoplasms classified under epithelial ovarian tumors.Malignant transformation of benign ovarian neoplasms is known as a rare complication, occurring in approximately 0.9% of patients with ovarian endometriosis. Clear cell adenocarcinoma is the most common endometriosis-associated ovarian cancer followed by endometrioid cancer. This is the case of a 56-year old post-menopausal patient initially presenting with increasingabdominal girth. Whole abdominal ultrasound revealed a large pelvo-abdominal mass. Transvaginal and transabdominal ultrasound findings of bilateral ovarian new growth with benign sonologic features. The patient underwent bilateral salpingo-oophorectomy. Histopathologic findings of the specimen submitted revealed high-grade spindle cell carcinoma arising in an endometrioid cystadenoma of the right ovary, and endometrioid cystadenofibroma with focal epithelial proliferation.

Evolutionary Law of Syndrome and Syndrome Elements during the Malignant Transformation of Chronic Hepatitis B / 中医杂志

ObjectiveTo clarify the evolutionary laws of syndromes and syndrome elements at different stages during the malignant transformation of chronic hepatitis B （CHB）. MethodsA total of 671 patients with hepatitis B virus infection， who were admitted to the outpatient and inpatient departments of Dongzhimen Hospital of Beijing University of Chinese Medicine and The Fifth Medical Center of Chinese PLA General Hospital from July 1st， 2020 to June 30th， 2021， were included， involving 120 cases of CHB， 340 cases of hepatitis B liver cirrhosis （HBLC）， 64 cases of precancerous lesions with hepatitis B liver cirrhosis （PLHC）， and 147 cases of hepatitis B liver cirrhosis with hepatocellular carcinoma （HCC）. A Survey form of traditional Chinese medicine syndrome during malignant transformation of chronic hepatitis B was designed， and the general information， auxiliary examination and the four examinations results were collected. Factor analysis and K-means clustering were used to determine and statistically analyze the syndrome and syndrome elements. ResultsFive traditional Chinese medicine （TCM） syndrome types were identified in CHB patients， while there were six TCM syndrome types in HBLC， PLHC and HCC stages. Among CHB patients， the main syndromes were liver constraint and spleen deficiency （53.33%） and liver-gallbladder damp-heat （21.67%）， and the dominant syndrome elements were qi stagnation （27.60%）， heat （17.71%） and qi deficiency （17.71%）. In the HBLC stage， the syndromes were mainly blood stasis obstructing the collaterals （23.83%） and liver constraint and spleen deficiency （22.35%）， with dominant syndrome elements being blood stasis （19.25%）， dampness （17.46%）， and qi deficiency （15.01%）. For the PLHC stage， the primary syndrome types were blood stasis obstructing the collaterals （29.68%） and liver-kidney yin deficiency （20.31%）， and the leading syndrome elements were blood stasis （22.12%）， yin deficiency （15.93%）， and qi deficiency （15.04%）. In the HCC stage， the syndrome was dominated by blood stasis obstructing the collaterals （33.34%） and liver-kidney yin deficiency （19.73%）， with the main syndrome elements being blood stasis （24.52%）， yin deficiency （16.09%）， and qi deficiency （15.33%）. During the progression of CHB to malignancy， there was a gradual decrease in excess syndromes including liver-gallbladder damp-heat and water-dampness internal obstruction from 21.67% to 19.04%. In contrast， deficiency syndromes including liver-kidney yin deficiency and spleen-kidney yang deficiency increased from 15.83% to 31.97%. Additionally， excess syndrome elements including qi stagnation， heat and dampness decreased from 59.89% to 34.48%， while deficiency syndrome elements including qi deficiency， yin deficiency and yang deficiency increased from 32.30% to 41.00%. ConclusionDuring the malignant transformation of CHB， there exists a progression of syndrome and syndrome elements， shifting from qi stagnation， heat and qi deficiency to blood stasis （predominantly excess）， dampness and qi deficiency， and then to blood stasis （predominantly deficiency）， yin deficiency and qi deficiency， characterized by “deficiency-excess complex， and shift from excess to deficiency”.

Uterine Epithelioid Leiomyosarcoma Arising Within Leiomyoma in A Postmenopausal Woman: A Case Report

@#Uterine leiomyosarcoma is a malignant smooth muscle tumour of the uterus. It is rare and accounting for less than 2% of cases in malignant gynaepathology. To date, only a few reported cases of leiomyosarcoma arising from leiomyoma documented in the literature. We shared an uncommon occurrence of leiomyosarcoma arising from leiomyoma. Presented herein is a case of a ‘rare epithelioid subtype’ of leiomyosarcoma arising from a leiomyoma in a postmenopausal woman. We highlighted the importance of recognizing the possibilities of this event to allow for a timely diagnosis of leiomyosarcoma and to provide insights on management of patients presented with clinically presumed fibroid.

HIF – 1? as a marker of risk assessment for malignant transformation in oral submucous fibrosis: An immunohistochemical study

Background: Oral submucous fibrosis (OSMF) is a potentially malignant disorder associated with habit of chewing betel quid containing arecanut. Morphological features of OSMF especially fibrosis suggests a possibility of the hypoxic environment in diseased tissues. The adaptation of cells to hypoxia appears to be mediated via hypoxia inducible factor-1? (HIF-1?) which is also said to be associated with malignant transformation of epithelial cells in various other carcinomas like prostate and cervical carcinoma. Therefore, the main objective of this study was to investigate the role of HIF-1? in progression and malignant transformation of OSMF. Materials and Methods: The study group consisted of histo-pathologically diagnosed 30 cases of oral submucous fibrosis and 10 cases of OSCC were taken as control. The immunohistochemistry was carried out on neutral buffered formalin-fixed paraffin-embedded tissue sections by using the monoclonal antibody of HIF-1?. Statistical analysis was done using SPSS software version 2.0. Results: A gradual and significant rise in the expression of HIF-1? was observed in various grades of OSMF and OSCC cases. HIF 1? expression was increased in cases showing hylanization and constricted blood vessels. A cut off value of 39.6% of HIF-1? positive cells was determined statistically to categorize the cases into high risk and low risk group for malignant transformation. Conclusion: Overexpression of HIF-1? may contribute to the progression and malignant transformation of OSMF. Cases expressing more than 40% of HIF-1? positive cells are at a greater risk for malignant transformation.

Expression of Ki67 as Potential Biomarker in Oral Submucous Fibrosis: An Immunohistochemical Study

Background: Oral submucous fibrosis (OSMF) is a potentially malignant disorder (PMD) known to transform into oral cancer. One of the important hallmarks of malignant transformation is the uncontrolled growth rate, commonly reflected as increased cell proliferation which can be significantly detected by proliferative markers such as a high Ki?67 index. Aim: The aim of this study is to evaluate the degree and pattern of expression of Ki67 in OSMF, oral squamous cell carcinoma (OSCC) and in normal mucosal (NOM) patients and to correlate the Ki67 expression with clinical and histological grading of OSMF and OSCC patient. Materials and Methods: A prospective cross?sectional study was conducted over a duration of two years. An immunohistochemical study was performed for Ki76 expression on 35 cases of OSMF, 10 cases of OSCC and 10 normal mucosal patients. Statistical Analysis: Data were analysed using SPSS version 21. Chi?squared test was used to analyse the differences between the intensity levels in OSMF, OSCC and NOM. Results: Expression of Ki67 was significantly higher in OSMF than that of NOM samples but less than that of OSCC samples. Expression of Ki67 increased with increasing grade of clinical and histological stages. Conclusion: The study demonstrated a high incidence of Ki67 overexpression in OSMF and OSCC and showed a correlation between clinical and histological grading of OSMF and OSCC. Identification of high?risk oral PMDs and intervention at premalignant stages could constitute one of the key steps in reducing the mortality, morbidity and cost of treatment associated with malignant transformation of these diseases

Clinicopathological observation of mature teratoma with malignant transformation, a single center retrospective study

Purpose: To investigate the clinicopathological features of mature teratoma with malignant transformation. Methods: Retrospectively analysis of 1179 cases mature teratoma was done from August 1999 to December 2019 in Institution. 14 cases of mature teratoma with malignant transformation were discussed mainly for the pathological characteristics and clinical manifestations. Results: 4 of them were less than 40 years old. All but one occurred in the ovaries, and the one was in the left anterior mediastinum which was the only male. The clinical manifestations of the patients were atypical. Imaging showed cystic solid mass. Surgery was performed. Polypoid mass, solid nodule and thickened area of cyst wall can be seen on the section of tumor. Pathological results show that there were 5 cases of squamous cell carcinoma, 3 cases of carcinoid, 2 cases of serous carcinoma and 2 cases of thyroid papillary carcinoma, 1 case of carcinosarcoma and 1 case of strumal carcinoid. Two cases of squamous cell carcinoma had pelvic and abdominal metastasis. Immunohistochemistry of case 14 showed that AE1/AE3, CD56, SYN, NSE, PSAP, CDX2 were positive in carcinoid. EMA and CK20 were positive in mucinous glands around carcinoid. Calretinin and inhibin were positive in the mesenchyme adjacent to intestinal mucinous gland. Conclusions: Teratoma with malignant transformation is a rare malignancy, although teratoma is a common germ cell tumor. And it's more common in patients over 40 years, especially those patients who were in menopause. Squamous cell carcinoma is the most common type and prone to metastasis. Strumal carcinoid was well-defined, but as an endocrine tumor, it may cause a series of digestive, respiratory or hormonal disorders. Therefore, the mature teratomas should be removed in time after detection.

ECCRINE SPIRADENOMA : CASE REPORT WITH AN UNUSUAL CLININAL PRESENTATION

Eccrine spiradenoma is one of the rare, benign dermal neoplasm showing eccrine sweat gland differentiation. The literature search accounts for less than 100 reported cases of eccrine spiradenoma. Clinically, the lesion presents as solitary, intradermal, circumscribed, round or oval, firm, painful or tender nodule measuring from 0.3 - 5 cm in diameter. Rarely if ES, presents as multiple lesions, in combination with other types of adnexal tumors such as cylindromas & trichoepitheliomas, it can be considered as a part of the Brooke-Spiegler syndrome. Majority of these tumours appear on the head/face & upper trunk region of the body. Spiradenomas arise in early adulthood in most instances with few reports also of congenital cases and no sex predilection seen. The definitive diagnosis is made by excisional biopsy of the tumour. Complete tumor excision with clear surgical margins is considered the primary treatment for these cases. Here, we present a rare case report of a 58 years old male presenting with a soft, cystic lesion in the left lumbar region of the abdomen for past 2 years duration. Surgical excision of the tumour was done with clear margins and the specimen was sent for histopathological examination. Due to the overlapping histomorphological features, this tumour is often confused with cylindromas and trichoepitheliomas along with other vascular tumours. Eccrine Spiradenoma, although a benign tumour, but malignant transformation has been described especially in long-standing cases or multiple lesions. So, early diagnosis is very important to prevent recurrence and to identify any onset of malignant transformation

Expressions of CD 138 and CD43 in Oral Leukoplakia

Introduction: Oral Leukoplakia is the second most common oral potentially malignant disorder encountered in day-to-day clinical practice, with an overall global prevalence of 4.11%. The rate of its malignant transformation varies worldwide. Aims & Objectives: The aim of the study was to assess CD 138 and CD43 immunoreactivity in oral epithelial dysplasia. Materials & Methods: Immunohistochemistry was performed on fifteen formalin-fixed oral epithelial dysplasia tissues for CD 43 (n=15) and CD 138 (n=15) which were obtained from archives at Oral cancer research and coordinating centre, Malaysia. Results: The expression of CD 43 in non-hematopoietic tissues was negative in all cases, but epithelium with dysplastic alterations had low or weak CD 138 expression between dysplastic tissue and non-dysplastic epithelium, there was a substantial difference in staining intensity. Conclusion: Oral carcinogenesis is a multistep process, and cancer driver genes have been shown to have vastly diverse effects in various tissues. CD 138 expression was shown to be lower in tissues undergoing dysplastic alterations, which could be a sign of oral epithelial dysplasia with a high risk of malignancy.

Epidemiological and Clinical Characteristics of Fibrous Dysplasia of Bone / 肿瘤防治研究

Objective To describe the epidemiological and clinical characteristics of fibrous dysplasia of bone admitted to a single center in the past 30 years. Methods We analyzed the clinical features of 744 patients with bone fibrous dysplasia diagnosed by pathology, including age, gender, disease location, monostotic or polyostotic lesions, pathological fracture and malignant transformation. Results There were 1183 lesions in 744 patients. The mean age at admission was 31.1±13.5 years old. The ratio of male to female was close to 1:1. The most common site was the lower extremities (916(77.4%)), followed by the upper extremities (106(9.0%)). The most common sites of lower extremities were the femur (645(54.5%)) and the tibia (224(18.9%)). Polyostotic cases accounted for 25.4%, and monostotic cases accounted for 74.6%. Pathological fracture occurred in 163 (13.8%) patients. There were 6 (0.8%) patients with malignant transformation. The mean age was 40.5 years old. The mean time of malignant transformation was 7.7 years. Conclusion Fibrous dysplasia of bone is a rare group of benign bone tumors, with typical epidemiological and clinical features.

Role and mechanism of IGF2BP3 in malignant transformation of human gastric epithelial cells induced by MNNG / 环境与职业医学

Background N6-methyladenosine (m6A) RNA methylation may play an important role in the process of malignant transformation of cells induced by environmental carcinogens. However, the specific roles and mechanisms need to be further explored. Objective To explore the role and mechanism of m6A binding protein insulin-like growth factor 2 mRNA-binding protein 3 (IGF2BP3) in the malignant transformation of human gastric mucosal epithelial cells GES-1 induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). Methods Based on the GES-1 malignant transformation cells MC-30, a stable knockdown IGF2BP3 MC-30 cell line (MC30-shIGF2BP3, abbreviated as MC30-shI3) was constructed by lentiviral transfection technology, and a negative control group (MC30-NC) was also prepared. Real-time quantitative polymerase chain reaction (qRT-PCR) and Western blotting were applied to detect the mRNA expression and protein levels of IGF2BP3. RNA binding protein immunoprecipitation (RIP-qPCR) was used to examine the combination between IGF2BP3 protein and MYC mRNA in malignant cells MC-30. Furthermore, the stability of MYC mRNA was detected by actinomycin D assay. CCK-8 and Transwell respectively were employed to detect cell proliferation, migration, and invasion. Western blotting was applied to detect the expression of EMT markers (N-cadherin, Vimentin, α-SMA, and Snail). The role of the downstream target gene MYC was further elucidated by a rescue assay in MC30-shI3 cells transfected with a plasmid overexpressing MYC to observe changes in cellular phenotypes (proliferation, migration, invasion) and expression of key EMT proteins. Results Compared with the control group, the expression of IGF2BP3 mRNA was up-regulated after 5, 10, 20, and 40 μmol·L−1 MNNG infection of GES-1 cells (P<0.05). After 20 μmol·L−1 MNNG infection, the expression level of IGF2BP3 mRNA increased with prolongation of exposure time (P<0.05). Compared with the control group, the mRNA and protein expression levels of IGF2BP3 were up-regulated in the 10th, 20th, and 30th generations of 5 μmol·L−1 MNNG malignant transformation (P<0.05). The results of qRT-PCR and Western blotting showed that, compared with the MC30-NC group, the IGF2BP3 and MYC mRNA expression and protein expression decreased in the MC30-shI3 group (P<0.01). The CCK8 and transwell assay results showed that, compared with the MC30-NC group, the cell proliferation, migration, and invasion abilities significantly reduced in the MC30-shI3 group (P<0.01). The results of the Western blotting showed that, compared with the MC30-NC group, the protein levels of EMT markers N-cadherin, Vimentin, α-SMA, and Snail decreased in the MC30-shI3 group (P<0.01). The results of RIP-qPCR showed that, compared with the IgG group, the mRNA level was higher for the enriched MYC in the IGF2BP3 group (P<0.01); the results of the actinomycin D assay showed that, compared with the MC30-NC group, the stability of MYC mRNA significantly reduced in the MC30-shI3 group (P<0.01). While the rescue experiment showed that, compared with the IGF2BP3 knock-down+vector group, the MYC protein level significantly increased in the IGF2BP3 knock-down + MYC over-expression group (P<0.01), the proliferation, migration, and invasion abilities significantly enhanced (P<0.01), and the EMT key proteins (N-cadherin, Vimentin, α-SMA, Snail) increased in the MC30-shI3+MYC group (P<0.01). Conclusion Exposure to MNNG could result in up-regulation of IGF2BP3 expression in GES-1 cells. IGF2BP3 may enhance the proliferation, migration, and invasion of malignantly transformed human gastric epithelial cells by binding to MYC mRNA and increasing its stability and expression level and thus promoting the EMT process, which in turn affects the progression of malignant transformation.

Research progress on mechanisms of malignant transformation of lung epithelial cells induced by PM2.5 exposure / 环境与职业医学

Fine particulate matter (PM2.5) has attracted more and more attention in the field of environmental pollution and public health. Previous studies have found that PM2.5 can be inhaled and deposit in the airway and alveoli, and even spread to the whole-body tissues and organs through blood, resulting in various toxic effects. The malignant transformation of lung epithelial cells associated with long-term exposure to PM2.5 may play an important role in the occurrence and development of lung cancer. This paper reviewed recent studies on the mechanisms of malignant transformation of lung epithelial cells associated with PM2.5 exposure, and discussed the main biological mechanisms, including epigenetics, tumor microenvironment, and other biological pathways. Besides, the potential research directions of malignant transformation of lung epithelial cells associated with PM2.5 exposure were proposed. This work aims to provide a scientific basis and reference for public health management and air quality assessment.

Malignant transformation of multiple adnexal tumors in a Filipino-American patient with Brooke-Spiegler Syndrome: A case report

@#<p style="text-align: justify;"><strong>INTRODUCTION:</strong> Trichoepithelioma is a benign hamartoma which may exhibit similar clinical and histopathological features with basal cell carcinoma. Since prognosis is dissimilar, differentiating between them is important. Literature reveals fifteen reports of malignant transformation of multiple trichoepitheliomas into basal cell carcinoma, with none in the local setting. In Brooke-Spiegler syndrome, the incidence rate of malignant transformation of benign neoplasms has been reported in 5-10 % of patients.</p><p style="text-align: justify;"><strong>CASE REPORT:</strong> A 53-year-old Filipino-American female presented with multiple discrete to coalesced, well-defined, skin-colored to hyperpigmented, smooth, dome-shaped, rubbery papules and nodules on the face since childhood. Throughout the years, lesions increased in number and size and spread to the scalp, chest, abdomen, back, upper and posterior right thigh. Some developed ulceration, telangiectasia and pigmentation.</p><p style="text-align: justify;">Chest radiography, radiographs of the jaw, whole abdominal ultrasound, cranial CT scan, ophthalmology and otorhinolaryngology assessments were normal. Based on clinical and histopathologic findings, the final diagnosis was Brooke-Spiegler syndrome with transformation into basal cell carcinoma. Carbon dioxide (CO2) laser was used to excise large and ulcerated lesions with good cosmetic results.</p><p style="text-align: justify;"><strong>CONCLUSION:</strong> A case of a Filipino-American adult female diagnosed clinically and histologically with Brooke-Spiegler syndrome with transformation into basal cell carcinoma was presented. Given the similarities in clinical and histopathologic features of trichoepithelioma and basal cell carcinoma, accurate diagnosis should be made because of their difference in prognosis. The use of an acceptable treatment modality such as carbon dioxide (CO2) laser in this case is an important emerging fi eld of study.</p><p style="text-align: justify;"><strong>KEYWORDS:</strong> trichoepithelioma, basal cell carcinoma, Brooke-Spiegler syndrome, malignant transformation, carbon dioxide laser</p>

PARP-1 participates in regulation of cell cycle signaling in the hydroquinone-induced TK6 malignant transformation / 中国职业医学

@#To investigate the expression of polyadenosine diphospho-ribose polymerase 1 (PARP-1) and p16/ retinoblastoma (Rb) protein in hydroquinone (HQ)-induced TK6 cells and their regulatory mechanisms. Methods According to the 2×2 factorial design model, TK6 cells were divided into PBS-TK6 group and HQ-TK6 group based on HQ exposure, and then sub-divided into non-DOX intervention subgroup and DOX intervention subgroup based on DOX intervention, a total of four groups. The PBS-TK6 group was treated with phosphate buffer saline, and the HQ-TK6 group was treated with HQ at a final concentration of 20.0 μmol/L. The non-DOX intervention subgroup was added with 0.05% dimethyl sulfoxide; and the DOX intervention subgroup was added with PARP-1 agonist DOX at a final concentration of 0.5 μmol/L. The distribution of cell cycle was detected by flow cytometry. The protein expression of p16/Rb, cyclin D1 (cyclinD1), multifunctional protein E2 transcription factor 1 (E2F1), Rb, and p-Rb were detected by Western blot, and the level of p16 ribosylation was detected by immunofluorescence and immunoprecipitation. Results Compared with the PBS-TK6 group, the cell cycle distribution percentage in G0/G1 phase and the relative expression levels of p16 proteins were decreased in the cells of the HQ-TK6 group (all P<0.05). The cell cycle distribution percentage in S phase and the relative expression levels of cyclinD1 and p-Rb proteins were up-regulated (all P<0.05). Compared with the non-DOX intervention group, the cell cycle distribution percentage in G0/G1 and G2/M phases and the relative expression level of p16 protein increased in the DOX intervention group (all P<0.05). The percentage of cells in S phase and the relative expression levels of cyclinD1 and p-Rb proteins were down-regulated (all P< 0.05). The results of interaction effect analysis showed that compared with the non-DOX PBS-TK6 cells, the relative expression levels of Rb and E2F1 protein in the DOX PBS-TK6 cells intervention group were down-regulated (all P<0.05). The relative expression level of Rb protein in non-DOX HQ-TK6 cell group was down-regulated (P<0.05), and the relative expression of E2F1 protein was up-regulated (P<0.05). Compared with DOX PBS-TK6 cell group, the relative expression level of Rb protein in DOX HQ-TK6 cell group was down-regulated and that of E2F1 protein was up-regulated (all P<0.05). Compared with the non-DOX HQ-TK6 cell group, the relative expression level of Rb protein in the DOX HQ-TK6 cell group was up-regulated and that of E2F1 protein was down-regulated (all P<0.05). Conclusion PARP-1 participates in cell cycle regulation by regulating the p16/Rb signaling pathway in TK6 cells.

Malignant transformation of a mature teratoma with concurrent cervical carcinoma versus squamous cell carcinoma of the cervix with ovarian metastasis: A diagnostic dilemma / Philippine Journal of Obstetrics and Gynecology

@#Mature cystic teratoma of the ovary may occur in 10%–20% of women during their lifetime. Its biological behavior is benign, while 0.17%–2% of them may undergo malignant transformation. Various histological types of malignant transformation include Squamous cell carcinoma (SCC), adenocarcinoma, small cell carcinoma, sarcoma, malignant melanoma, and mixed histology. SCCA of the cervix occurs more commonly at ages 45–55. This is mainly caused by human papillomavirus 16 and 18. This tumor spreads to local then regional lymph nodes and can have hematogenous spread to bone and lungs, rarely to the ovaries. This report is of a 75‑year‑old Gravida 9 Para 9 (9009) with an enlarging pelviabdominal mass, managed as a case of ovarian new growth with later findings of cervical cancer. The case merits presentation because of the dilemma in diagnosis.