We sought to develop a simple and sensitive method based on mutant allele-specific amplification (MASA) for the detection of point mutations in the k-ras oncogene in blood samples. We used MASA and three nested MASA methods to detect a point mutation (GGT-->GAT) in rat DHD cells at codon 12 of exon 1 of the k-ras gene. MASA allowed us to detect one k-ras mutated cell on a background of 10(7) normal cells. The third nested-MASA (nested-MASA.c) method that we developed allowed us to detect one mutated cell among 10(10) normal cells. Our methods should allow the detection of small amounts of mutant k-ras DNA in tissue, serum, and plasma, combining speed with efficiency and specificity.
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http://dx.doi.org/10.1385/MB:22:2:115 | DOI Listing |
Am J Cancer Res
December 2024
Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, Japan.
No established method currently exists for evaluating tumor-infiltrating lymphocytes (TILs) in gastric cancer (GC), and their clinical significance based on infiltration site in GC remains unclear. In this study, we developed a method to evaluate TILs according to their infiltration site as a prognostic marker for GC. We retrospectively analyzed 103 patients with advanced GC who underwent curative resection.
View Article and Find Full Text PDFEndosc Ultrasound
December 2025
Department of Gastroenterology, Beijing Friendship Hospital, Capital Medical University, National Clinical Research Center for Digestive Disease, Beijing, China.
Background And Objectives: Distal biliary strictures (DBSs) can be caused by various malignancies, making accurate and early diagnosis crucial. Histopathology is the gold standard for diagnosis, with several methods available for tissue sampling. This study evaluates the performance of EUS-guided fine-needle aspiration (EUS-FNA) cytologic smears and histopathology in diagnosing suspected malignant DBSs.
View Article and Find Full Text PDFActas Esp Psiquiatr
January 2025
Department of Neurosurgery, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, 325000 Wenzhou, Zhejiang, China.
Background: Diagnosing psychiatric disorders following craniocerebral trauma primarily depends on clinical symptoms and neuropsychological evaluation, which can be subjective and limited. This study aimed to investigate the diagnostic value of serum matrix metalloproteinase-9 (MMP-9), S100 calcium-binding protein β (S100-β), and glial fibrillary acidic protein (GFAP) in post-traumatic mental disorders.
Methods: A retrospective analysis was conducted on 108 patients with craniocerebral trauma admitted to Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine between January 2021 and December 2023.
Anal Methods
January 2025
Otolaryngology, Head and Neck Surgery Department of Fujian Provincial Hospital, Provincial Clinical Medical College of Fujian Medical University, Fuzhou University Affiliated Provincial Hospital, Fuzhou, Fujian, 35001, China.
Pepsin serves as a potential biomarker for laryngopharyngeal reflux disease (LPRD). The reported methods for detecting pepsin still have limitations, such as long reaction times and low sensitivity. Therefore, it is crucial to develop a rapid, simple and sensitive detection method.
View Article and Find Full Text PDFAm J Epidemiol
November 2024
Departments of Epidemiology and Biostatistics, Harvard T. H. Chan School of Public Health, 677 Huntington Avenue, Boston, MA 02115, United States.
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