condition compromise opinion situation protocol investigator aes underlying medical assessment safety interfere opinion investigator compromise illness evaluation drug condition dysfunction unacceptably places toxicities high risk condition opinion medical investigator patient patient cognitive information compromise complete psychiatric comply study conditions ability tolerate compromise significant ability patients therapy opinion medical illness illnesses compromise safety investigator opinion condition abnormality patient medical ability study performing subject meeting prevent compromise study opinion requirements condition investigator successful psychological compromise safety opinion unstable participation conditions medical investigator threatening dysfunction safety compromise outcomes organ life undue illness opinion objectives compromise opinion investigator condition study medical protocol nonmalignant sponsor