NGF and intracranial hemorrhage: But nerve growth factor (NGF) as an extensively applied neurotrophic factor (NTF) has been found playing an important role in the survival, growth, differentiation and regeneration of neurons.8,9 Currently, NGF has been extensively applied in treating cerebral infarction and spinal and peripheral nerve injury, but few studies are available concerning the clinical efficacy of NGF in treating intracranial hemorrhage.