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In chronic hepatitis B patients with or exposed to the risk of osteoporosis or renal dysfunction, switching from tenofovir disoproxil fumarate (TDF) to tenofovir alafenamide fumarate (TAF) or entecavir (ETV) may be the right choice.

This study aimed to present real-life data in terms of the efficacy and safety of a TAF/ETV treatment change while receiving TDF.

This retrospective study was conducted on 344 adult patients from 10 centers. The data of patients who had changed to ETV (n = 107) and TAF (n = 237) while receiving TDF were analyzed. The data collected at 0 and 6 months of treatment were analyzed. The virological response was assessed based on undetected hepatitis B virus (HBV) DNA. Serum alanine aminotransferase (ALT) values were used to evaluate the biochemical response. For renal function, serum creatinine and phosphorus, as well as estimated glomerular filtration rate (eGFR), were recorded. Moreover, lumbar spine and hip T-scores along with the serum lipid profile were evaluated.

The mean age of patients was 41.14 ± 13.46 years, and 224 (65.1%) of the participants were male. The treatment arms were not significantly different in terms of demographic characteristics, comorbid diseases, infection duration, family history of HBV infection, blood platelet count, serum biomarkers, such as ALT, phosphorus, creatinine, total bilirubin, albumin, lipid profile, and HBV DNA levels at the beginning. No statistically significant difference was found between the proportion of undetectable HBV DNA of the two treatment groups after 6 months (P = 0.221). The ALT normalization in the ETV and TAF groups at the sixth month compared to the baseline levels was not significantly different (P = 0.853, P = 0.330, respectively). There was no statistically significant difference between the two treatment arms regarding changes in eGFR, creatinine, phosphorus, hip, and spine T-scores from baseline to 6 months (P = 0.296, P = 0.78, P = 0.141, P = 0.832, P = 0.947, respectively). In those who switched to TAF or ETV, low-density lipoproteins cholesterol were observed to be significantly higher after 6 months compared to baseline values (P = 0.002, P = 0.049, respectively). The TC increased significantly in the TAF group (P = 0.035).

Our study showed that switching to ETV and TAF sustained the viral suppression and biochemical response achieved by TDF therapy. The treatment switch to TAF of ETV can control renal dysfunction and reduce bone mineral density caused by TDF.

 Chronic hepatitis B (CHB) is a viral infection that can result in life-threatening conditions, such as hepatocellular carcinoma and cirrhosis. Tenofovir, which is used for the treatment of CHB, is a nucleotide analog that inhibits HBV-DNA polymerase and has two formulations: disoproxil and alafenamide. In contrast to tenofovir disoproxil fumarate (TDF), tenofovir alafenamide fumarate (TAF) penetrates the whole hepatocyte without being eliminated due to its longer plasma half-life and greater plasma stability. As a result, side effects such as proximal renal tubulopathy and loss of bone density are less common in the treatment of TAF and have similar efficacy to TDF.

 The purpose of the study was to evaluate the effectiveness and reliability of TAF using real-life data.

 This retrospective cohort study was carried out in secondary or tertiary healthcare centers in southern Turkey. A total of 480 patients aged 18 years and older were administered TAF for an appropriate indication by the infectious diseases and gastroenterology clinics of the healthcare centers participating in this study. The data collected at t = 0, t = 3, and t = 6 months of treatment were analyzed. The chi-square, Mann-Whitney U, Friedman, Wilcoxon, Cochran’s Q, and McNemar’s tests were used.

 The mean age of the patients was 47.40 ± 14.5, and 327 of them (68.1%) were male. A total of 78.1% of the 480 patients who underwent the TAF treatment had previous antiviral therapy experience (TDF, n = 340; 70.8 %), and 21.9% were treatment-naive. The most common reasons for the initiation of TAF treatment were the use of drugs affecting bone mineral density (BMD) (42.9%) and osteoporosis (22.3%). Patients who had taken TDF experienced a significant improvement in glomerular filtration rate (GFR), hip and spine T-scores, and phosphorus levels from t = 0 months to t = 6 months after switching to TAF (P < 0.05). For this group, no statistically significant difference was observed concerning LDL and cholesterol levels from t = 0 months to t = 6 months. Side effects were reported by 5.7% of patients in the third month and 7.1% in the sixth month, with the most common side effect being hair loss (1%).

 TAF was found to be an effective and safe alternative to TDF with lower incidences of its long-term effects, such as nephrotoxicity and decreased bone density.
 

In patients with chronic hepatitis C, triple drug regimens containing a protease inhibitor, peginterferon and ribavirin were found to significantly increase sustained virologic response rates compared to dual drug regimen containing pegylated interferon and ribavirin, especially in genotype 1.. In Turkey, telaprevir has been used since March 2013. We aimed to evaluate results of patients with chronic hepatitis C treated with telaprevir, peginterferon and ribavirin.. Patients and We evaluated 28 patients with genotype 1 chronic hepatitis C infection treated with triple drug regimen containing telaprevir, in three medical centers in Turkey, retrospectively. Demographic data of patients, treatment indications, adverse events and outcomes were recorded.. Of 28 patients intended to treat, 25 (89.2%) patients completed the treatment. Overall, 21 (82.1%) patients had relapse and five patients were non-responder. Regarding the treatment outcomes of Telaprevir based regimen, 20/26 patients achieved sustained virological response. Pruritus, rash, dysgeusia, anorectal discomfort and anemia were main adverse effects. Blood transfusion and ribavirin dose reduction required for 7 and 11 patients, respectively. Due to several adverse effects, 10 patients were hospitalized.. Although more frequent and severe adverse effects, telaprevir has been promising for patients with treatment-experienced hepatitis C..