0 mg or 0.5 mg according to eGFR by MDRD) due to renal side effects. HBV DNA, ALT, serum creati-nine, eGFR, serum phosphate levels and tubular phosphate re-absorption

(TmPO4/eGFR) were assessed at baseline (start ETV) and every 3 months. Hypophosphatemia was defined as grade 1 (<2.5 mg/dL), grade 2 (<2.3), grade 3 (<2.0), whereas hyperphosfaturia (TmPO4/eGFR) was classified as grade 1 (<0.80), grade 2 (<0.60) and grade 3 (<0.40). Results: At baseline, 6 (33%), 7 (39%) and 5 (28%) patients had grade 1, 2 or 3 hypophosphatemia, whereas 12 (67%) and 6 (33%) patients had grade 2 or grade 3 hyperphosphaturia, respectively. During 6 months (range: 5-12) of ETV therapy (1.0 mg in 8 patients and 0.5 in 10 patients), median serum creatinine remained unchanged (1.20 vs 1.17 mg/dL), whereas eGFR (60 vs 62 mL/min, p=0.004), serum phosphate levels (2.2 vs 2.4 mg/dL, p=0.046) and TmPO4/eGFR (0.42 vs 0.57 mmol/L,

p=0.004) significantly increased. Doxorubicin datasheet After ETV switch, 7 Sorafenib ic50 (39%) patients achieved normal phosphatemia levels (>2.5 mg/dL) as well as either normal phosphaturia or grade 1 iperphosphaturia. As far virological responses are concerned, 13 (72%) patients maintained a virological response whereas 5 (28%) patients(3 treated with 0.5 mg/24h) had a mild virological breakthrough (HBV DNA: 10, 17, 20, 27, 79 IU/mL) without ALT increase, occurring between month 3 and 6. In one of the 2 patients in whom ETV dose was increased to 1 mg, HBV DNA was cleared from serum. In 2 patients who had a further increase of HBV DNA (from 27 to 244; from 79 to 109 IU/mL) ETV was topped and TDF restarted. Conclusions: Switching to ETV monotherapy patients who developed renal side effects during long-term TDF treatment, improved kidney tubular function with minimal risk of virological rebounds. Disclosures: Pietro Lampertico – Advisory Committees or Review Panels: Bayer, Bayer; Speaking and Teaching: Bristol-Myers Squibb, Roche, GlaxoSmithKline, Novartis,

Gilead, Bristol-Myers Squibb, Roche, GlaxoSmithKline, Novartis, Gilead Mauro Viganò – Consulting: Roche; Speaking and Teaching: N-acetylglucosamine-1-phosphate transferase Gilead Sciences, BMS Massimo Colombo – Advisory Committees or Review Panels: BRISTOL-MEYERS-SQUIBB, SCHERING-PLOUGH, ROCHE, GILEAD, BRISTOL-MEYERS-SQUIBB, SCHERING-PLOUGH, ROCHE, GILEAD, Janssen Cilag, Achillion; Grant/Research Support: BRISTOL-MEYERS-SQUIBB, ROCHE, GILEAD, BRISTOL-MEYERS-SQUIBB, ROCHE, GILEAD; Speaking and Teaching: Glaxo Smith-Kline, BRISTOL-MEYERS-SQUIBB, SCHERING-PLOUGH, ROCHE, NOVARTIS, GILEAD, VERTEX, Glaxo Smith-Kline, BRISTOL-MEYERS-SQUIBB, SCHERING-PLOUGH, ROCHE, NOVARTIS, GILEAD, VERTEX The following people have nothing to disclose: Giampaolo Mangia, Floriana Facchetti, Federica Invernizzi, Roberta Soffredini Background & Aims: Telbivudine (TBV) is a potent antiviral agent for the treatment of chronic HBV (Hepatitis B virus) infection. However, there is little information on the effect of TBV in chronic hepatitis B (CHB) patients with cirrhosis.