Long-term effects of tenofovir on host Selleckchem Napabucasin immune system are needed to be elucidate. Disclosures: Chang Wook Kim – Consulting: Gilead, MSD; Grant/Research Support: BMS, Handok, Pharmicell, Pharmaking; Speaking and Teaching: BMS, Donga, Dae-woong The following people have nothing to disclose: Hyosun Cho, Yu seung Kim, Hee Yeon Kim, Jong Young Choi, Seung Kew Yoon, Chang Don Lee Background: Hepatocellular carcinoma is the second most common cause of cancer death worldwide. In India 50 %of HCC cases are attributable to HBV infection. T regulatory cells (Tregs) increase and are likely to play a major role in HCC development. Expansion of Tregs is also induced by HBV

infection. To understand their role in HCC, we investigated the expression of CD4+CD25+CD127-veFoxP3+ Tregs and their suppressor

factors like PD1, IL-10 and TGF-p in HBV related HCC as compared to non-HBV-HCC. Patients and Methods: Patients with chronic hepatitis B infection (Gr. A, CHBV, n=10), HBV related HCC (Gr. B, HBV-HCC, n=17) and non-HBV-HCC (Gr. C, n=22; NASH =16, Alcohol related, n=6) were recruited. Whole blood was collected in EDTA vials for surface and intracellular immunophenotyping by flow cytom-etry. Using multicolour flow cytometry, expression of FoxP3, IL-10, PD-1, TGF-p, and Notch1 was observed in CD4+ CD25+hi CD127-ve and also in CD8+ CD25+hi T regulatory cells.

Pyruvate dehydrogenase Results: Alpha-fetoprotein (AFP) levels were high in Gr. B (16349.20 ±4220) than Gr. C patients (1589±456). The total lymphocyte count and CD8+Tcells find more were significantly lower in Gr. B compared to Gr. A (p=0.003 and p=0.04) and Gr. C (p=0.009 and p=0.05). Foxp3 expression in CD4+CD25+hi CD127-ve and CD8+CD25+hi was increased in Gr. B compared to Gr. C (p=0.007 and p=0.05; Fig 1). Low level of AFP and decreased CD4+CD25+hi population showed positive correlation (R=0.49, p=0.02) in non-HBV-HCC. While CD4+ CD25+hi Tregs in Gr. B patients were secreting more of IL-10 compared to Gr. C (p=0.01) (Fig.1). The CD4+ FoxP3+ Tregs showed high TGF-p production in Gr. B pateints compared to Gr. C and Gr. A, the PD1 expression on CD4+ CD25+hi cells was significantly lower in Gr. B than Gr. C patients (p=0.04) (Fig.1). Conclusions: CD4+ CD25+hi Tregs from HBV- HCC show decreased expression of PD-1, resulting in increased IL-10 and TGF-p secretion. High production of immunosuppressive cytokines i.e. IL-10 and TGF-p, by Treg cells and low PD1 expression suggests that these cells are more active in immune suppression in HBV related HCC compared to non-HBV-HCC. Disclosures: The following people have nothing to disclose: Shreya Sharma, Paul David, Rakhi Maiwall, Amrish Sahney, Ritu Khosla, Ashish Vyas, Shiv K.