We report 2 cases of plexiform angiomyxoid myofibroblastic tumor of the stomach, a tumor entity that has not been described previously. The patients were a 50-year-old man (case 1) and a 68-year-old man (case 2). In case 1, the patient presented with acute abdominal pain. The tumor in case 2 was incidentally found at laparoscopic cholecystectomy. Grossly, the tumors were 4.0 cm (case 1) and 4.5 cm (case 2) in their greatest dimension, and they were recognized as submucosal tumors. The tumor caused gastric perforation in case 1. Histologically, the tumors extended from the serosa to the submucosa of the gastric wall, showing a plexiform growth pattern. Bland spindle tumor cells were observed, and they were separated by abundant intercellular myxoid matrix. The stroma was rich in small vessels. Immunohistochemically, the tumor cells were positive for alpha-smooth muscle actin and muscle actin, and negative for KIT, CD34, and S-100 protein. Electron microscopic findings were consistent with the myofibroblastic nature of the tumor cells. No mutations were found in the c-kit and platelet-derived growth factor receptor alpha genes. Although clinical follow-up data were insufficient, the histologic appearances suggested the benign nature of the tumors. However, the tumor in case 1 caused gastric perforation and necessitated an emergency operation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1097/01.pas.0000213448.54643.2f | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
True cancer stem cells exhibit relative degrees of dormancy and genomic stability.
Neoplasia
January 2025
Department of Pathology, Anatomy and Cell Biology and the Clinical and Translational Research Center of Excellence, Meharry Medical College, 1005 Dr. D.B. Todd Jr. Boulevard, Nashville, TN 37208, USA.
Background: Cancer stem cells in human tumors have been defined by stem cell markers, embryonal signaling pathways and characteristic biology, ie., namely the ability to repopulate the proliferating population. However, even if these properties can be demonstrated within a tumor cell subpopulation, it does not mean that they are truly hierarchical stem cells because they could have been derived from the proliferating population in a reversible manner.
View Article and Find Full Text PDFLipid-Rapamycin Nanovaccines Overcome the Antidrug Antibody Barrier in Biologic Therapies.
ACS Nano
January 2025
Wuya Faculty of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China.
Antidrug antibodies (ADAs) against biologics present a major challenge for sustained biotherapy, including enzyme replacement therapies and adeno-associated virus (AAV) gene therapies. These antibodies arise from undesirable immune responses, leading to altered pharmacokinetics, reduced efficacy, and adverse reactions. In this study, we introduced a rationally designed lipid-rapamycin (Rapa)-based nanovaccine to restore immune tolerance to biologics and overcome drug resistance.
View Article and Find Full Text PDFVisualization of Apical-Basal Stress Polarity Regulating Directed Cell Migration with a FRET-Based Biosensor.
ACS Sens
January 2025
Cancer Hospital of Dalian University of Technology, Shenyang 110042, China.
Intracellular morphological apical-basal polarity, regulated by conserved polarity proteins, plays a crucial role in cell migration and metastasis. In this study, using a genetically encoded Förster resonance energy transfer (FRET) biosensor to visually present the spatiotemporal stress state between the lipid rafts on the membrane and the linked actin, we first provide the evidence for the existence of intrinsic apical-basal stress polarity in tumor cells and demonstrate that this polarity is a prerequisite for the formation of flow-induced front-back stress polarity. Interestingly, our study revealed that the front-back stress polarity disappeared upon the disruption of intrinsic apical-basal stress discrepancy, resulting in a large attenuated cell migration activity reduced from 76.
View Article and Find Full Text PDFThe tumour histopathology "glossary" for AI developers.
PLoS Comput Biol
January 2025
Centre for Evolution and Cancer, Institute of Cancer Research, London, United Kingdom.
The applications of artificial intelligence (AI) and deep learning (DL) are leading to significant advances in cancer research, particularly in analysing histopathology images for prognostic and treatment-predictive insights. However, effective translation of these computational methods requires computational researchers to have at least a basic understanding of histopathology. In this work, we aim to bridge that gap by introducing essential histopathology concepts to support AI developers in their research.
View Article and Find Full Text PDFSimultaneous Induction of Immunogenic Pyroptosis and PD-L1 Downregulation by One Single Photosensitizer for Synergistic Cancer Photoimmunotherapy.
J Med Chem
January 2025
Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P. R. China.
Pyroptosis, an excellent form of immunogenic cell death that can effectively activate antitumor immune responses, is attracting considerable interest as a promising approach for cancer immunotherapy. Immunogenic pyroptosis can recruit and stimulate dendritic cells to provoke further activation and tumor infiltration of T cells by releasing danger-associated molecular patterns, thus improving the tumor response to PD-1/PD-L1 checkpoint blockade immunotherapy. Here, we report the discovery of a bifunctional photosensitizer Nile Violet that can simultaneously trigger caspase-3/GSDME-mediated immunogenic pyroptosis and PD-L1 downregulation for cancer photoimmunotherapy.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!