severity of adverse event AE severity G1 AE severity Grade 1 CTCAE4: E10005 (Grade 1 Adverse Event) YH, SS a severity of AE that shows asymptomatic, or involves mild or minor symptoms, or is of marginal clinical relevance, or consists of clinical or diagnostic observations alone, or where intervention is not indicated, or where only non-prescription intervention is indicated. Note the AE severity Grade 1 equals to CTCAE G1 AE severity. Web: http://ncicb.nci.nih.gov/xml/owl/EVS/ctcae.owl#Grade_1_Adverse_Event