Reclassification of Mongolian Diffuse Gliomas According to the Revised 2016 World Health Organization Central Nervous System Tumor Classification
JOURNAL OF PATHOLOGY AND TRANSLATIONAL MEDICINE
Authors: Ochirjav, Enkhee; Enkhbat, Bayarmaa; Baldandorj, Tuul; Choe, Gheeyoung
Abstract
Background: The 2016 World Health Organization (WHO) classification of central nervous system (CNS) tumors has been modified to incorporate the IDH mutation and 1p/19q co-deletion in the diagnosis of diffuse gliomas. In this study, we aimed to evaluate the feasibility and prognostic significance of the revised 2016 WHO classification of CNS tumors in Mongolian patients with diffuse gliomas. Methods: A total of 124 casesof diffuse gliomas were collected, and tissue microarray blocks were made. IDH1 mutation was tested using immunohistochemistry, and 1p/19q co-deletion status was examined using fluorescence in situ hybridization analysis. Results: According to the 2016 WHO classification, 124 cases of diffuse brain glioma were reclassified as follows: 10 oligodendroglioma, IDHmut and 1p/19q co-deleted; three anaplastic oligodendroglioma, IDHmut and 1p/19q co-deleted; 35 diffuse astrocytoma, IDHmut, 11 diffuse astrocytoma, IDHmut, not otherwise specified (NOS); 22 anaplastic astrocytoma, IDHmut, eight anaplastic astrocytoma, IDHwt, NOS; and 35 glioblastoma, IDHwt, NOS, respectively. The 2016 WHO classification presented better prognostic value for overall survival in patients with grade II tumors than traditional histological classification. Among patients with grade II tumors, those with oligodendroglioma and 1p/19q co-deleted and diffuse astrocytoma IDH(mut )showed significantly higher survival than those with diffuse astrocytoma IDHmut, NOS (p <.01). Conclusions: Mongolian diffuse gliomas could be reclassified according to the new 2016 WHO classification. Reclassification revealed substantial changes in diagnosis of both oligodendroglial and astrocytic entities. We have confirmed that the revised 2016 WHO CNS tumor classification has prognostic significance in Mongolian patients with diffuse gliomas, especially those with grade II tumors.
In vitro mutagenic effect of cedar (Cedrus libani A. Rich) tar in the salmonella/microsome assay system
BANATS JOURNAL OF BIOTECHNOLOGY
Authors: Takci, Hatice Aysun Mercimek; Turkmen, Filiz Ucan; Sari, Mehmet
Abstract
Cedar tar is obtained by pyrolytic breakdown of Cedrus libani A. Rich (Pinaceae) wood. Cedrus libani A. Rich (Pinaceae) grows on the Taurus Mountains in Southern Turkey, Eastern Mediterranean, Western Syria and Lebanon. Objective: The main objective of this study is to investigate the mutagenic and antioxidant effect of Cedar tar produced from cedarwoods collected from Gume village of Mut, Mersin, Turkey. Methods: The mutagenic activity of Cedar tar was screened by using Salmonella typhimurium TA98 and TA100 strains, with and without S9 metabolic activation in this study. Three concentrations of (10, 15 and 25 mg/plate) Cedar tar were examined in AMES assays. Results: Cedar tar was found to be non-mutagenic against strains TA98 and TA100 (p>0.05) in the presence and absence of S9 metabolic activation. Cedar tar did not show any antioxidant activity based on DDPH radical scavenging. The total phenolic and flavonoid contents of tar were 0.85 +/- 0.06 mg GAE/g and 0.068 +/- 0.02 mg RE/g, respectively. Conclusions: Antimutagenic, cancerogenic and cytotoxic effects of Cedar tar should also be investigated by using different test systems.