GPT and Gastrointestinal hemorrhage: Specifically, Yokota et al. (2008) reported “striking” elevations of liver function tests (alanine aminotransferase [ALT] of 676) in a child with Ebstein-Barr Virus infection along with a case of gastrointestinal hemorrhage in the double-blind phase, along with grade 2 elevations of ALT in 12/50 subjects during the 48-week open label extension phase [37].