1. Diagnosed as B-cell Non-Hodgkin's Lymphoma (NHL) according to "2008 WHO classification of tumors of haematopoietic and lymphoid tissues", including Diffuse Large B-Cell Lymphoma (DLBCL), Follicular Lymphoma (FL) grade 1-3, Marginal Zone Lymphoma (MALT), Lymphoplasmacytic Lymphoma (LPL), Small Lymphocytic Lymphoma (SLL), Mantle Cell Lymphoma (MCL), transformed indolent lymphoma (TL), and other subtypes that investigators consider to be appropriate to be enrolled;