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The molecular pathogenesis of follicular lymphoma (FL) was partially revealed by the discovery of BCL2 translocations to the region encoding the immunoglobulin heavy chain, which accompany the vast majority of cases. This aberration leads to the ectopic and constitutive expression of anti-apoptotic BCL2 protein in B-cells. Nevertheless, the aberration alone is not sufficient for FL development, which suggests necessity of further genetic aberrations acquisition for neoplastic transformation to FL. Their discovery has been enabled by recent progress in the field of massive parallel sequencing (next generation sequencing), which revealed high number of genetic aberrations connected with onset and progression of FL. The occurrence of many of these aberrations in the early stages of the disease, and the fact that they are shared by the majority of patients with FL, fundamentally changed our former understanding of the disease onset. Furthermore, in a large fraction of patients, FL undergoes histological transformation to a more aggressive lymphoma, which is also associated with specific genetic alterations. In this review, we summarize the current knowledge of molecular pathways connected with FL biology and discuss their role in the context of normal B-cell development. Understanding of FL biology is essential for the development of new targeted therapies and the stratification of patients, and potentially also for the selection of treatment for specific patients who share the same genetic aberrations.Key words: follicular lymphoma - mutation - aberration - apoptosis - epigenetic regulators - microRNA This research was carried out under the project CEITEC 2020 (LQ1601) with financial support from the Ministry of Education, Youth and Sports of the Czech Republic under the National Sustain ability Programme II. The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study. The Editorial Board declares that the manuscript met the ICMJE recommendation for biomedical papers.Submitted: 28. 1. 2017Accepted: 5. 3. 2017.

Novel Findings in Follicular Lymphoma Pathogenesis and the Concepts of Targeted Therapy