Dementia or altered mental status that would prohibit informed consent Psychiatric disorder or altered mental status precluding informed consent or protocol-related testing Have dementia or altered mental status that would prohibit informed consent Dementia or altered mental status that would prohibit informed consent Dementia or altered mental status that would prohibit informed consent Dementia or altered mental status that would prohibit informed consent Dementia or altered mental status that would prohibit informed consent Dementia or altered mental status that would prohibit the understanding and giving of informed consent Have dementia or altered mental status that would prohibit informed consent Patients with dementia or altered mental status that would prohibit the giving and understanding of informed consent at the time of study entry Patients with dementia or altered mental status that would prohibit the giving and understanding of informed consent at the time of study entry Patients with dementia or altered mental status that would prohibit the giving and understanding of informed consent at the time of study entry Patients with dementia or altered mental status that would prohibit the giving and understanding of informed consent at the time of study entry Altered mental status precluding understanding of the informed consent process and/or completion of the necessary studies Dementia or altered mental status that would prohibit the understanding of informed consent Dementia or altered mental status that would prohibit informed consent Psychiatric disorder or altered mental status precluding informed consent or protocol-related testing Dementia or significantly altered mental status that would prohibit the understanding and giving of informed consent Dementia or altered mental status that would prohibit informed consent Subjects with altered mental status that would prohibit the giving and understanding of informed consent, and assent when applicable, who do not have a legally authorized representative. Serious medical condition that would impair the ability to receive or tolerate margetuximab; dementia or altered mental status that would preclude provision of informed consent Psychiatric disorder, altered mental status precluding informed consent or necessary testing Altered mental state