Topic
Hyperplastic Polyp
About: Hyperplastic Polyp is a research topic. Over the lifetime, 1822 publications have been published within this topic receiving 66095 citations.
Papers published on a yearly basis
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Papers
TL;DR: Assessment of the pathological findings of SSA/Ps is appropriate to show a significantly higher proliferative activity as compared to HPs, and the use of two-dimensional image analysis software is an objective and reproducible method for this type of histological examination.
Abstract: Serrated polyps belong to a heterogeneous group of lesions that are generally characterized morphologically. This type of lesion is thought to be the precursor of sporadic carcinomas with microsatellite instability, and probably also the precursor for CpG island-methylated microsatellite-stable carcinomas. For practical purposes, according to the 2010 WHO classification, the diagnostic criteria for sessile serrated adenomas/polyps (SSA/Ps) was established by the research project “Potential of Cancerization of Colorectal Serrated Lesions” led by the Japanese Society for Cancer of the Colon and Rectum. The aim of this study was to evaluate the validity of the morphologic characteristics established in Japan by using immunohistochemical staining for Ki-67. To calculate the target cells, 2 contiguous crypts which could be detected from the bottom of the crypt to the surface of the colorectal epithelium were selected. To validate the proliferative activity, we evaluated the percentage and the asymmetrical staining pattern of Ki67 positive cells in each individual crypt. To examine the immunoreactivity of Ki67, computer-assisted cytometrical analysis was performed. SSA/Ps had a higher proliferative activity as compared to hyperplastic polyps (HPs) based on the difference in incidence of Ki67 positive cells, and the former also exhibited a significantly higher asymmetric distribution of these cells as compared to HPs, even in lesions with a diameter <10 mm. We conclude that assessment of the pathological findings of SSA/Ps, including crypt dilation, irregularly branching crypts, and horizontally arranged basal crypts (inverted T- and/or L-shaped crypts) is appropriate to show a significantly higher proliferative activity as compared to HPs. Further, the use of two-dimensional image analysis software is an objective and reproducible method for this type of histological examination. The virtual slides for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/6718091416698112
51 citations
TL;DR: In this article, the authors studied the histopathologic and histochemical features of several gastric specimens of nine members of this family and searched for the expression of carcinoembryonic antigen (CEA), p21 protein (ras oncogene), p53 protein (p53 suppressor gene), and simple mucin-type carbohydrate antigens (Tn, sialosyl-Tn and T antigen before and after neuraminidase) and for the presence of Helicobacter pylori.
Abstract: Background. The authors previously described a large pedigree with familial gastric polyposis and a high incidence of gastric cancer and demonstrated the autosomal dominant pattern of inheritance. The current study described the histologic and immunohistologic features of the lesions in an attempt to clarify the mechanisms underlying gastric carcinogenesis in this family.
Methods. The authors studied the histopathologic and histochemical features of several gastric specimens of nine members of this family and searched for the expression of carcinoembryonic antigen (CEA), p21 protein (ras oncogene), p53 protein (p53 suppressor gene), and simple mucin-type carbohydrate antigens (Tn, sialosyl-Tn, and T antigen before and after neuraminidase) and for the presence of Helicobacter pylori.
Results. The two carcinomas available for histologic revision were of the diffuse type. One of them apparently originated from a hyperplastic polyp. Hyperplastic polyps were diagnosed in five of seven patients without carcinoma. The remaining two patients had marked foveolar hyperplasia. Chronic atrophic gastritis with complete intestinal metaplasia (IM) was seen in three patients. p53 protein was not expressed in any of the cases. CEA and ras p21 oncoprotein were found in six and eight cases, respectively (mainly in hyperplastic foveolar epithelium). Tn, sialosyl-Tn, and T antigen were expressed in every case. H. pylori colonization was detected in all but the two patients with carcinoma.
Conclusions. The authors concluded that foveolar hyperplasia/hyperplastic polyps play a key role in the development of diffuse carcinoma in this inherited polyposis, confined to the stomach, with hyperplastic phenotype. The genetic and environmental mechanisms underlying this particular situation remain to be clarified.
51 citations
TL;DR: After considerable debate in the medical literature about the existence of de novo cancer and the classification of colorectal polyps and their relationship to cancer, the concept of the adenoma–carcinoma sequence emerged in the 1970s as the dominant morphogenetic explanation of colOREctal cancer.
Abstract: After considerable debate in the medical literature about the existence of de novo cancer and the classification of colorectal polyps and their relationship to cancer (4), the concept of the adenoma–carcinoma sequence emerged in the 1970s as the dominant morphogenetic explanation of colorectal cancer (5). The hyperplastic polyp was recognized as a frequently occurring lesion, but common knowledge held that its only importance resided in the need to distinguish it from the adenoma because the hyperplastic polyp was regarded as having no malignant
51 citations
TL;DR: Gastric differentiation is a feature of hyperplastic polyps and of a subset of adenomatous polyps which is shared by early carcinomas arising in some of these polyps, regardless of the histological type of polyp and of carcinoma.
Abstract: The expression of two trefoil peptides (TFF1 and TFF2) and four mucins (MUC1, MUC2, MUC5AC, and MUC6) was evaluated by immunohistochemistry and reverse transcription-polymerase chain reaction (RT-PCR) in 29 gastric polyps, 10 hyperplastic and 19 adenomatous, eight of which displayed malignant transformation. The aims of this study were to characterize the expression profile of these molecules in each type of polyp and to investigate possible modifications of the profile during the process of malignant transformation. All hyperplastic polyps displayed immunoreactivity for TFF1, MUC5AC, and MUC1 in more than 75 per cent of the cells. In adenomatous polyps, three main phenotypes could be identified: complete gastric phenotype (co-expression of TFF1 and MUC5AC)—nine cases (47·4 per cent); incomplete gastric phenotype (TFF1-positive and MUC5AC-negative)—seven cases (36·8 per cent); non-gastric (intestinal) phenotype (no expression of TFF1 or MUC5AC)—three cases (15·8 per cent). Data yielded by immunohistochemistry and RT-PCR showed a good correlation for both TFF1 and TFF2. One hyperplastic and seven adenomatous polyps with villous architecture displayed foci of diffuse and intestinal-type carcinoma, respectively; in all of these cases, MUC1 expression and signs of gastric differentiation were observed in both the non-malignant and the carcinomatous component. It is concluded that gastric differentiation is a feature of hyperplastic polyps and of a subset of adenomatous polyps which is shared by early carcinomas arising in some of these polyps, regardless of the histological type of polyp and of carcinoma. Copyright © 1999 John Wiley & Sons, Ltd.
51 citations
TL;DR: After resectoscopic polypectomy, the recurrence rate of endometrial polyps is high and the hyperplastic polyps without atypia recur more frequently than benign ones, and the histopathologic features showed significant differences between patients with and without polyp recurrence.
Abstract: Aims: To estimate the recurrence rate of patients with endometrial polyps and to evaluate whether the recurrence can be correlated with the histopathologic features of the polyp. Methods: Two hundred and eighty-two women with endometrial polyps in both pre- or postmenopausal period and suffering from abnormal uterine bleeding or not were treated by resectoscopic surgery in a tertiary university hospital and were subsequently followed to check for polyp recurrence. Results: Polyp recurrence rate after hysteroscopic surgery and correlation between recurrence and main demographic, hysteroscopic and histopathologic characteristics were analyzed. During mean ± SD follow-up period of 26.3 ± 19.7 months, the overall recurrence rate was high (13.3%) and did not vary (p = NS) with age, parity, weight or other demographic characteristics of the patients or with the hysteroscopic appearance. On the contrary, the histopathologic features showed significant differences between patients with and without polyp recurrence. Recurrence rate was higher (p Conclusion: The study shows that after resectoscopic polypectomy, the recurrence rate of endometrial polyps is high (13.3%). Moreover, the hyperplastic polyps without atypia recur more frequently than benign ones.
51 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 19 |
| 2024 | 20 |
| 2023 | 86 |
| 2022 | 104 |
| 2021 | 61 |
| 2020 | 58 |