KLF4 and diffuse large B-cell lymphoma: 5) Finally, in a tissue microarray (TMA) that includes 43 biopsies of patients with NHL, the expression of miR-7 was determined by ISH and YY1/KLF4 expression by Immunohistochemistry, and in GEO database analysis, miR-7 was analyzed in DLBCL and FL data.