Enanta Pharmaceuticals, Inc., (NASDAQ:ENTA), a research and development-focused biotechnology company dedicated to creating small molecule drugs for viral infections and liver diseases, today reported financial results for its fiscal fourth quarter and year ended September 30, 2016. Enanta's cash, cash equivalents and short-term and long-term marketable securities totaled $242.2 million at September 30, 2016. Enanta expects that its current cash, cash equivalents and marketable securities will be sufficient to meet the anticipated cash requirements of its existing business for the foreseeable future. Fiscal Fourth Quarter and Year Ended September 30, 2016 Financial ResultsRevenue from royalties on AbbVie's hepatitis C virus (HCV) treatment regimens was $12.8 million for the three months ended September 30, 2016 compared to $14.4 million for the same period in 2015. For the twelve months ended September 30, 2016, total revenue was $88.3 million compared to total revenue of $160.9 million for the same period in 2015. The decrease in revenue in the 2016 period was due to milestone payments of $125.0 million earned in 2015, compared to milestone payments of $30.0 million earned in 2016. The decrease in milestone revenue was partially offset by an increase in royalty revenue of $23.6 million. The $125.0 million and $30.0 million milestone payments were received from AbbVie under our collaboration agreement and were based on the achievement of commercialization regulatory approvals of AbbVie's hepatitis C virus (HCV) treatment regimens in the U.S. and Europe (2015) and Japan (2016), respectively. Enanta's milestone payments, royalties and other payments received from collaborations have varied significantly from period to period, and are expected to continue to do so. Research and development expenses totaled $11.5 million for the three months ended September 30, 2016, compared to $7.0 million for the same period in 2015. For the twelve months ended September 30, 2016, research and development expenses were $40.5 million, compared to $23.2 million for the same period in 2015. The increases in the three and twelve month periods were primarily due to increased pre-clinical and clinical costs associated with the progression of Enanta's wholly-owned R&D programs in HCV cyclophilin, non-alcoholic steatohepatitis (NASH), respiratory syncytial virus (RSV) and hepatitis B virus (HBV).