The study aimed to compare the usefulness of two staining methods for imprint cytology for diagnosis of Helicobacter pylori infection. Gastric biopsy specimens (from dyspeptic patients attending ...routine upper gastrointestinal endoscopy) were placed on glass slides to obtain imprints. The imprints were stained with Toluidine blue and Giemsa stains separately and observed under ×400 magnification using a light microscope. Imprinted biopsies were sectioned and stained with H & E stain and Giemsa stain for histological analysis. Diagnosis of H. pylori infection in both imprint and histological sections were confirmed by a consultant pathologist. The sensitivity, specificity, positive predictive value and negative predictive value of each stain were calculated and benchmarked against histological diagnosis.
Of the 55 dyspeptic patients enrolled in the study, 5 were positive for H. pylori by Toluidine blue stain and 4 by Giemsa stain. The sensitivity of Toluidine blue stain (57.1%) was higher than Giemsa stain (42.9%) while the specificity of both stains was equal (97.9%). Giemsa stain gave a better discrimination for identification of H. pylori bacteria among the mucosal background. Imprint cytology is a rapid, simple and cost effective diagnosis method that can supplement histological diagnosis.
Cutaneous leishmaniasis (CL) is caused by Leishmania donovani in Sri Lanka. Pentavalent antimonials (e.g., sodium stibogluconate SSG) remain first-line drugs for CL with no new effective treatments ...emerging. We studied whole blood and lesion transcriptomes from Sri Lankan patients with CL at presentation and during SSG treatment. From lesions but not whole blood, we identified differential expression of immune-related genes, including immune checkpoint molecules, after onset of treatment. Using spatial profiling and RNA-FISH, we confirmed reduced expression of programmed death-ligand 1 (PD-L1) and indoleamine 2,3-dioxygenase 1 (IDO1) proteins on treatment in lesions of a second validation cohort and further demonstrated significantly higher expression of these checkpoint molecules on parasite-infected compared with noninfected lesional CD68+ monocytes and macrophages. Crucially, early reduction in PD-L1 but not IDO1 expression was predictive of rate of clinical cure (HR = 4.88) and occurred in parallel with reduction in parasite load. Our data support a model whereby the initial anti-leishmanial activity of antimonial drugs alleviates checkpoint inhibition on T cells, facilitating immune-drug synergism and clinical cure. Our findings demonstrate that PD-L1 expression can be used as a predictor of rapidity of clinical response to SSG treatment in Sri Lanka and support further evaluation of PD-L1 as a host-directed therapeutic in leishmaniasis.
Use of oral squamous cell carcinoma: A discussion paper Senevirathna, Kalpani; Jayawardana, Nadeeka; Udumalagala Gamage, Chandrika ...
International health trends and perspectives,
03/2023, Letnik:
3, Številka:
1
Journal Article
Recenzirano
Oral squamous cell carcinoma (OSCC) is one of the most common epithelial malignancies of multifactorial etiology linked with considerable mortality and morbidity. Generally, OSCC arises from ...pre-existing oral lesions quoted as oral potentially malignant disorders. Early diagnosis of OSCC is an attractive strategy to increase the survival rate of patients. Despite the accessibility of prominent diagnostic tools, many factors restrain the successful application of these approaches. The discovery of novel alternative methods to diagnose cancer definitively with higher selectivity and sensitivity has aroused scientific interest. Metabolomics is an unbiased analytical approach for qualitative and quantitative analyses of different metabolites in cells, tissues, or biological fluids and their alterations in response to pathophysiological stimuli. Several coupled techniques, together with chromatographic platforms, have facilitated metabolic profiling and, at the same time, detected cancer biomarkers, which are crucial for an effective treatment process. This overview discusses some of the most recent technological advances in metabolomics and focuses on their application to reveal the underlying causes of OSCC and their potential implications for personalised medicine.
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