IGFBP6 and breast cancer: Since IGFBP-6 has shown an inhibitory effect on IGF functions in many cancer cell lines for example in human breast cancer, so reduced IGFBP-6 levels can therefore, affect cell growth in multiple ways, such as increasing IGF bioavailability and reducing IGF independent growth inhibitory effects etc. So we can conclude that due to O-β-GlcNAc modification at Ser 204, binding of IGFBP-6 with IGF-II reduced and resulting in binding of IGF-II with IGF-II receptor and promote cancer progression which can lead to hepatocellular carcinoma in HCV infected patients (Figure 4).