In addition, recent work has shown that forced overexpression of hnRNP K can increase the invasive capacity of mouse fibroblasts NIH3T3 by increasing MMP3 expression [45], although the expression level of MMP3 was not changed in hnRNP K-knockdown human NPC cells (Additional file 2: Table S2). The gene discussed is HNRNPK; the disease is nasopharyngeal carcinoma.