An optimized BRCA1/2 next-generation sequencing for different clinical sample types / 부인종양

An optimized BRCA1/2 next-generationsequencing for different clinical sample types / 부인종양

Objective@#A simultaneous detection of germline and somatic mutations in ovarian cancer (OC) using tumor materials is considered to be cost-effective for BRCA1/2 testing. However, there are limited studies of the analytical performances according to various sample types. The aim of this study is to propose a strategy for routine BRCA1/2 next-generation sequencing (NGS) screening based on analytical performance according to different sample types. @*Methods@#We compared BRCA1/2 NGS screening assay using buffy coat, fresh-frozen (FF) and formalin-fixed paraffin-embedded (FFPE) from 130 samples. @*Results@#The rate of repeated tests in a total of buffy coat, FF and FFPE was 0%, 8%, and 34%, respectively. The accuracy of BRCA1/2 NGS testing was 100.0%, 99.9% and 99.9% in buffy coat, FFPE and FF, respectively. However, due to the presence of variant allele frequency (VAF) shifted heterozygous variants, tumor materials (FFPE and FF) showed lower sensitivity (95.5%–99.0%) than buffy coat (100%). Furthermore, FFPE showed 51.4% of the positive predictive value (PPV) on account of sequence artifacts. When performed in the post-filtration process, PPV was increased by approximately 20% in FFPE. Buffy coat showed 100% of sensitivity, specificity and accuracy in BRCA1/2 NGS test. @*Conclusions@#On the comparison of the analytical performance according to different sample types, the buffy coat was not affected by sequencing artifacts and VAF shifted variants. Therefore, the blood test should be given priority in detecting germline BRCA1/2 mutation, and tumor materials could be suitable to detect somatic mutations in OC patients without identifying germline BRCA1/2 mutation.

A Case of Primary Tuberculosis of the Palatine Tonsil in a Child / 대한이비인후과학회지

Tonsillar tuberculosis is uncommon and is almost secondary to pulmonary tuberculosis. Primary tonsillar tuberculosis is very rare, especially in children. The incidence of tuberculosis has been greatly reduced with chemotherapy, although it has not been eradicated. Recently, we experienced one case of pediatric primary tonsillar tuberculosis of left palatine tonsil. It was diagnosed pathologically after tonsillectomy and adenoidectomy. The purpose of this report is to point out that primary tonsillar tuberculosis still exists and to draw attention to the differential diagnosis in children.