Expression of programmed cell death ligand-1 protein in germinal center B-cell-like and non-germinal center B-cell-like subtypes of diffuse large B-cell lymphoma.

Diffuse large B-cell lymphoma (DLBCL) is the most common type of non-Hodgkin lymphoma worldwide. However, there is still limited information on the expression of programmed cell death ligand-1 (PD-L1), a type 1 transmembrane protein of immunoglobulin B7/CD28 in the DLBCL subtypes. The present study aimed to identify the expression of PD-L1 in germinal center B-cell-like (GCB) subtype and non-germinal center B-cell-like (non-GCB) subtype of DLBCL. A total of 40 patient samples (formalin-fixed paraffin-embedded tissues) consisting of 20 cases of GCB subtype and 20 cases of non-GCB subtype of DLBCL were examined. The PD-L1 protein expressions were evaluated by using immunohistochemical staining in the tumor cells. The results showed a statistically significant difference (P=0.003) between the expression of PD-L1 in the GCB subtype and the non-GCB subtype of DLBCL. PD-L1 expression in the tumor cells were observed in 13 cases (65%) of non-GCB subtype and in three cases (15%) of the GCB subtype of DLBCL. In conclusion, it was found that the expression of PD-L1 protein in the tumor cells of the non-GCB subtype of DLBCL was significantly higher as compared with the tumor cells of the GCB subtype of DLBCL.

Malignant lymphomas in Waldeyer's ring in Asian countries: Association with histologic types and Epstein-Barr virus.

The present study examines clinicopathologic findings and their association with the Epstein-Barr virus (EBV) in Waldeyer's ring lymphomas (WRLs) from Indonesia (91 cases), P.R. China (31 cases), Korea (101 cases) and Japan (61 cases). Waldeyer's ring (WR) was categorized into upper and lower parts comprising the pharyngeal and tubal tonsils (upper WR) or palatine and lingual tonsils (lower WR), respectively. Diffuse large B-cell lymphoma (DLBCL) pre-dominated in the lower WR in all countries at a frequency of 78.9-100%. Natural killer/T-cell lymphoma (NKTCL) was predominant in the upper WR in China, Korea and Japan at a frequency of 50-62.5%, while in Indonesia it occcurred at a frequency of less than 10%. On the whole, patients with NKTCL were significantly younger (median 43 years) than those with DLBCL (57 years). Patients with DLBCL in the lower WR were significantly younger in Indonesia (median 50 years) than in China (63 years) or Japan (69 years). The percentage of EBV-positive cases was much higher in NKTCL (78.6-100%) than in DLBCL (2.2-6%). This study evaluates the differences between East and Southeast Asian countries in terms of histologic type and age distribution in WRLs categorized by the location of the lesions in WR.

Gene mutation analysis of sinonasal lymphomas in Indonesia.

Sinonasal lymphomas comprise NK/T-cell (NKTCL) type and B-cell type with unique geographical development. In this study, mutations of p53, K-ras, c-kit, beta-catenin, and bak gene were analyzed using polymerase chain reaction (PCR)-single strand conformation polymorphism (SSCP) followed by direct sequencing in 41 sinonasal lymphomas (27 NKTCL and 14 B-cell type) from Indonesia. In situ hybridization study with EBER-1 probe revealed that 85% of NKTCL cases were EBV positive, but none of B-cell type was EBV positive. Frequency of mutations in p53, K-ras, c-kit, beta-catenin, and bak gene was 62.9%, 0%, 11.1%, 18.5%, and 25.9%, respectively, in NKTCL, and 71.4%, 0%, 23.1%, 21.4%, and 57.1%, respectively, in B-cell cases, showing that mutation frequency in all genes was higher in B-cell than in NKTCL cases. These findings suggest that gene mutations might be the driving-force for B-cell lymphoma, whereas combined EBV infection and gene mutations contribute to NKTCL development in Indonesia.

The plausibility and promptness of some pathological aspects of breast cancer. "DHARMAIS" NCCH.

Breast Cancer (BC) still interest to be discussed, comparison studies from several investigators still in controversial, especially on risk factors of BC, otherwise BC morbidity and mortality were stationary, infact, had a tendency increasing. Epidemiology studies on BC, daily observation for a long period explored that some Indonesian BC cases from different areas were young, plenty of the Indonesian BC cases were admission to hospital in a late stage (TNM III-IV). Western style of life influences on diet, cooking, breast feeding, smoking, etc. Recent studies on bimolecular sciences gave so much hopes on a large scope of human being-non human being, though there were also some threatenings and confusions. On Pathology Molecular, there were so many bimolecular techniques approached to search what was the exactly happening in cellular level of some diseases; so do on carcinogenesis. Searching intracellular abnormalities could be divided into: cellular membrane level, cytoplasmic level, nucleic membrane level, and intranucleus (DNA, RNA) level. Formerly, cytology and histopathology examination had only emphasized the morphological appearances of varied pathological lesions, included Cancer-BC. Recently there were new techniques worldwide well established, well known. Which one we will choose for BC? Benefit?