Non-pregnant and non-lactating Participants who are pregnant or lactating Is pregnant or lactating Pregnant or lactating Not pregnant or lactating, willing to prevent pregnancy while on study and for months after the last dose of XMT- Currently pregnant or lactating Subject is pregnant or lactating Lactating or pregnant woman Patient is pregnant or lactating. Pregnant or lactating Must not be breastfeeding/lactating. Subject who is pregnant or lactating. Not pregnant or lactating Lactating woman Pregnant or lactating EXCLUSION - TREATMENT: Pregnant or lactating EXCLUSION - INFUSION: Pregnant or lactating Lactating or pregnant TREATMENT EXCLUSION: Pregnant or lactating Lactating or pregnant Patient is pregnant or lactating The patient is pregnant or lactating. Pregnant or lactating Pregnant or lactating Pregnant or lactating Pregnant or lactating. Pregnant or lactating Pregnant or lactating Pregnant or lactating EXCLUSION - TREATMENT: Pregnant or lactating If they are pregnant or lactating Pregnant or lactating, or intending to become pregnant during the study Pregnant or lactating, or intending to become pregnant during the study Is lactating or pregnant as confirmed by pregnancy tests performed within days before enrollment Non-pregnant and non-lactating Pregnant or lactating, or intending to become pregnant during or within months after the last dose of study treatment Exclusion Criteria Related to Atezolizumab: Patient is pregnant or lactating and does not agree to stop breastfeeding. Pregnant, lactating, or not using adequate contraception. Subjects who are pregnant or are lactating Currently pregnant, lactating or breastfeeding. Pregnancy and/or lactating. Pregnant or lactating Lactating or pregnant Is pregnant or lactating DONOR: Pregnant or lactating Pregnant or lactating, or intending to become pregnant during the study Lactating or pregnant Pregnant or lactating Pregnant or lactating individuals. Lactating or pregnant Pregnant or lactating subjects Be pregnant or lactating PRIOR TO LYMPHODEPLETION: Pregnant or lactating Pregnant or lactating individuals. Subjects must not be pregnant or lactating Pregnant or lactating Pregnant or lactating Subject that is pregnancy or lactating Pregnant or lactating woman AT THE TIME OF INFUSION: Pregnant or lactating Pregnant or lactating Pregnant or lactating individuals. Pregnant or lactating Pregnant or lactating RECIPIENT: Pregnant or lactating Pregnant or lactating Pregnant or lactating. Pregnant or lactating Lactating or pregnant Pregnant or lactating Pregnant or lactating Pregnant or lactating pregnant or lactating Pregnant or Lactating. Pregnant or lactating Pregnant, lactating, or not using adequate contraception Pregnant, lactating or not using adequate contraception. Lactating or pregnant Is pregnant or lactating. Subjects who are pregnant or lactating; Non-pregnant and non-lactating. If they are pregnant or lactating Who are pregnant and/or lactating Pregnant or lactating Pregnant or lactating Pregnant or lactating, or intending to become pregnant during the study Subject is pregnant or is lactating Subject is pregnant or lactating Pregnant or lactating, or intending to become pregnant during the study Subject is pregnant or lactating Pregnant or lactating Pregnant or lactating Participant is pregnant or lactating. The participant is pregnant prior to randomization or lactating. Subject is pregnant or lactating Pregnant or lactating Pregnant or lactating or intending to become pregnant during the study Participants who are pregnant or lactating Lactating or pregnant subjects Lactating or pregnant Pregnant or lactating. Lactating or pregnant Not pregnant or lactating Are pregnant or lactating. Pregnant or lactating Participant is pregnant or lactating Participants who are pregnant or lactating Pregnant or lactating Lactating or pregnant subjects Currently pregnant or lactating AT THE TIME OF INFUSION: Pregnant or lactating Lactating or pregnant. Subjects who are pregnant or lactating. Pregnancy and/or lactating Patient is pregnant, lactating, or breastfeeding A pregnant or lactating woman. Pregnant or lactating. Patient is pregnant or lactating Pregnant or lactating Pregnant or lactating Lactating or pregnant Pregnant or lactating Pregnant or lactating Lactating or pregnant. Pregnant or lactating Pregnant or lactating pts DONOR: not pregnant or lactating Pregnant or lactating Pregnant or lactating Pregnant or lactating DONOR: Not pregnant or lactating Pregnant or lactating subjects. Woman who is pregnant or lactating Participant is pregnant or lactating Pregnant or lactating Subject is pregnant or lactating. Are pregnant or lactating Patient is pregnant or lactating The participant is pregnant or lactating. Pregnant or lactating Currently lactating. Pregnant or lactating The participant is pregnant or lactating Subject is pregnant or lactating Pregnant or lactating Lactating or pregnant Lactating or pregnant Pregnant or lactating The patient is pregnant or lactating The subject is known or suspected to be pregnant or lactating Pregnant or lactating Pregnant and/or lactating within year prior to screening breast MRI Must be non-pregnant and non-lactating for at least one year prior to pre-registration Patient is pregnant or lactating and does not agree to stop breastfeeding. Pregnant or lactating Lactating Subjects who are pregnant and/or lactating are not eligible Not pregnant or lactating and does not intend to become pregnant during the study Pregnant or lactating The patient is pregnant or lactating Subjects who are pregnant or lactating or who suspect they might be pregnant Subjects who are pregnant or lactating or who suspect they might be pregnant Subjects who are pregnant or lactating or who suspect they might be pregnant Patient who is pregnant and/or lactating Subject is pregnant or lactating Non-pregnant and non-lactating Not pregnant or not lactating Patient is lactating (breastfeeding) or pregnant Participants who are pregnant, lactating, or who suspect they might be pregnant are not eligible Pregnant or lactating Subjects who are pregnant or lactating Subjects who are pregnant or lactating or who suspect they might be pregnant The subject is pregnant or lactating. Subject is pregnant or lactating The patient is pregnant or lactating. Pregnant or lactating, or intending to become pregnant during the study