RESUMO
There is limited information regarding the clinicopathological features of low-grade tubuloglandular (LGTGA) and mucinous (MAC) adenocarcinomas occurring in inflammatory bowel disease (IBD), especially with regard to their precursor lesions. METHODS AND RESULTS: Forty-six IBD colectomy specimens with LGTGA (n = 17) or MAC (n = 29) with adjacent precursor lesions were analysed. As controls, 12 IBD colectomy specimens with well- to moderately differentiated adenocarcinoma that lacked any mucinous, signet ring cell, low-grade tubuloglandular or serrated features were also analysed. Compared with MACs and controls, LGTGAs more often had a flat/invisible macroscopic appearance (LGTGAs = 88%, MACs = 34%, controls = 25%, P < 0.001). MACs were more likely to have high-grade differentiation (MACs = 31%, LGTGAs = 0%, controls = 0%, P = 0.002) and a higher pathological stage (pT3 and pT4 MACs = 76%, LGTGAs = 35%, controls = 33%, P = 0.007) than LGTGAs and controls. LGTGAs (70%) and MACs (53%) were more frequently associated with non-conventional dysplasia than controls (0%) (P < 0.001). Crypt cell (40%) and hypermucinous (34%) dysplasias were the most common non-conventional subtypes associated with LGTGAs and MACs, respectively. Synchronous dysplasia often demonstrated non-conventional features in the LGTGA (33%) and MAC (47%) groups (versus 0% for the control group, P = 0.074). Synchronous cancer frequently showed similar histological features as the main tumour (LGTGA group = 60%, MAC group = 38%, control group = 100%). CONCLUSIONS: Crypt cell and hypermucinous dysplasias are the most common precursor lesions associated with LGTGAs and MACs, respectively, and may serve as a marker of increased risk for these cancer subtypes.
Assuntos
Adenocarcinoma Mucinoso , Adenocarcinoma , Neoplasias Colorretais , Doenças Inflamatórias Intestinais , Humanos , Neoplasias Colorretais/patologia , Doenças Inflamatórias Intestinais/complicações , Doenças Inflamatórias Intestinais/patologia , Adenocarcinoma Mucinoso/patologia , Adenocarcinoma/patologia , HiperplasiaRESUMO
Esophageal squamous cell carcinomas (ESCCs) harbor recurrent chromosome 3q amplifications that target the transcription factor SOX2. Beyond its role as an oncogene in ESCC, SOX2 acts in development of the squamous esophagus and maintenance of adult esophageal precursor cells. To compare Sox2 activity in normal and malignant tissue, we developed engineered murine esophageal organoids spanning normal esophagus to Sox2-induced squamous cell carcinoma and mapped Sox2 binding and the epigenetic and transcriptional landscape with evolution from normal to cancer. While oncogenic Sox2 largely maintains actions observed in normal tissue, Sox2 overexpression with p53 and p16 inactivation promotes chromatin remodeling and evolution of the Sox2 cistrome. With Klf5, oncogenic Sox2 acquires new binding sites and enhances activity of oncogenes such as Stat3. Moreover, oncogenic Sox2 activates endogenous retroviruses, inducing expression of double-stranded RNA and dependence on the RNA editing enzyme ADAR1. These data reveal SOX2 functions in ESCC, defining targetable vulnerabilities.
Assuntos
Adenosina Desaminase/metabolismo , Epigenoma , Neoplasias Esofágicas/genética , Carcinoma de Células Escamosas do Esôfago/genética , Proteínas de Ligação a RNA/metabolismo , Fatores de Transcrição SOXB1/metabolismo , Regiões 3' não Traduzidas/genética , Animais , Sequência de Bases , Carcinogênese/genética , Linhagem Celular Tumoral , Transformação Celular Neoplásica/genética , Inibidor p16 de Quinase Dependente de Ciclina/metabolismo , Retrovirus Endógenos/genética , Elementos Facilitadores Genéticos/genética , Regulação Neoplásica da Expressão Gênica , Genoma Humano , Humanos , Interferons/metabolismo , Íntrons/genética , Fatores de Transcrição Kruppel-Like/genética , Camundongos , Organoides/patologia , Ligação Proteica , RNA de Cadeia Dupla/metabolismo , Fatores de Transcrição SOXB1/genética , Proteína Supressora de Tumor p53/metabolismoRESUMO
OBJECTIVE: Cholecystectomy materials are frequently encountered in routine practice. The aim of this study was to determine the true frequency of gallbladder lesions, the diagnostic consistency, and standardization of reports after macroscopic sampling and microscopic evaluation based on previously defined criteria. MATERIAL AND METHOD: 14 institutions participated in the study within the Hepato-Pancreato-Biliary Pathology Study Group. Routinely examined cholecystectomies within the last year were included in the study in these institutions. Additional sampling was performed according to the indications and criteria. The number of blocks and samples taken in the first macroscopic examination and the number of blocks and samples taken in the additional sampling were determined and the rate of diagnostic contribution of the additional examination was determined. RESULTS: A total of 5,244 cholecystectomy materials from 14 institutions were included in the study. Additional sampling was found to be necessary in 576 cases (10.98%) from all institutions. In the first macroscopic sampling, the mean of the numbers of samples was approximately 4 and the number of blocks was 2. The mean of the numbers of additional samples and blocks was approximately 8 and 4, respectively. The diagnosis was changed in 144 of the 576 new sampled cases while the remaining 432 stayed unaltered. CONCLUSION: In this study, it was observed that new sampling after the first microscopic examination of cholecystectomy materials contributed to the diagnosis. It was also shown that the necessity of having standard criteria for macroscopic and microscopic examination plays an important role in making the correct diagnosis.