Although some initial studies reported recurrent brain tumors as a frequent cause of death in children treated with GH (292), a study that followed 180 children treated with GH who had brain tumors concluded that there was not a substantial trend in relative risk of recurrence with cumulative time for which GH treatment had been administrated and GH does not result in elevated risk of recurrent brain tumors (293). Here, GH1 is linked to brain neoplasm.