BLK and sarcoma: SFK is a family of proto-oncogenic non-receptor tyrosine kinases consisting of members: c-Src (Sarcoma), Blk (B-lymphoid tyrosine kinase), Fgr (Gardner-Rasheed feline sarcoma), Fyn, Frk (Fyn-related kinase), Hck (Hematopoietic cell kinase), Lck (Lymphocyte specific kinase), Lyn, Yes (Yamagichi sarcoma), and Yrk (Yes-related kinase) [17].