Ongoing or recent (within 5 years) evidence of autoimmune disease that required treatment with systemic immunosuppressive treatments; Has active autoimmune disease that has required systemic treatment in past 2 years (ie, with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Active autoimmune disease that has required systemic treatment in past 2 years. Has an active autoimmune disease that has required systemic treatment in the past 2 years (eg, with use of disease-modifying agents, anticoagulants, corticosteroids or immunosuppressive drugs). Active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease that has required systemic treatment within the last 2 years. Has an active autoimmune disease that has required systemic treatment in past 2 years. Has an active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease that has required systemic treatment in past 2 years Has an active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease-modifying agents, corticosteroids, or immunosuppressive drugs) Has an active autoimmune disease that has required systemic treatment in the past 2 years. Autoimmune disease that required systemic treatment Active autoimmune disease that has required systemic treatment in the past 2 years Has active autoimmune disease that has required systemic treatment in past 2 years. Active autoimmune disease including active diverticulitis, symptomatic peptic ulcer disease, colitis, or inflammatory bowel disease that has required systemic treatment in past 2 years Has an active autoimmune disease that has required systemic treatment in past 2 years Has an active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease modifying agents, corticosteroids, or immunosuppressive drugs). Replacement therapy is allowed. Active autoimmune disease that has required systemic treatment in past 2 years. Has an active autoimmune disease that has required systemic treatment in past 2 years. Has active autoimmune disease that has required systemic treatment in the past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs) Active autoimmune disease that has required systemic treatment in past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Has active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease that has required systemic treatment in the past 2 years Has active or prior autoimmune disease within the past 2 years Subject has an active autoimmune disease that has required systemic treatment within the past 2 years. Has active autoimmune disease that has required systemic treatment in past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Active or inactive autoimmune disease or syndrome that has required systemic treatment in the past 2 years or receiving systemic therapy for an autoimmune or inflammatory disease. Has an active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease modifying agents, corticosteroids, or immunosuppressive drugs) Active autoimmune disease that has required systemic treatment in past 2 years. Has active autoimmune disease that required systemic treatment with use of disease modifying agents, corticosteroids or immunosuppressive drugs Active autoimmune disease that has required systemic treatment in past 2 years Has active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease-modifying agents, corticosteroids, or immunosuppressive drugs. Has an active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease requiring systemic treatment in past 2 years. Active autoimmune disease that has required systemic treatment in past 2 years Active or prior documented autoimmune disease within the past 2 years Active autoimmune disease that has required systemic treatment in past 2 years. Has an active autoimmune disease that has required systemic treatment in the past 2 years. Active autoimmune disease that required systemic treatment in the past 2 years Active autoimmune disease requiring systemic treatment within the past 2 years Has an active autoimmune disease requiring systemic treatment within the past 2 years OR a documented history of clinically severe autoimmune disease. Has active autoimmune disease that has required systemic treatment in past 2 years. History of any autoimmune disease which required systemic therapy in the past 2 years Evidence of other active autoimmune disease that has required prolonged systemic treatment in past 2 years. Active autoimmune disease that has required systemic therapy in the past 2 years with modifying agents, corticosteroids, or immunosuppressive agents Active autoimmune disease that has required systemic treatment in the past 2 years (replacement therapies for hormone deficiencies are allowed) Active autoimmune disease that has required systemic treatment in past 2 years. Active autoimmune disease that has required systemic treatment in past 2 years. Active autoimmune disease that has required systemic treatment in past 2 years. Has active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease-modifying agents, corticosteroids, or immunosuppressive drugs) Active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease requiring systemic treatment in the past 2 years Has active autoimmune disease that has required treatment in the past 2 years. Active autoimmune disease that has required systemic treatment in the past 2 years (replacement therapies for hormone deficiencies are allowed) Active autoimmune disease that required systemic treatment in the past. Patients who have not required systemic treatment for at least two years may be enrolled if permission is provided after discussion with the Medical Monitor. Active, known, suspected autoimmune disease requiring systemic treatment in the past 2 years Has active or prior documented autoimmune disease within the past 24 months Has active autoimmune disease that has required systemic treatment within the 2 years prior to the first dose of study medication Active autoimmune disease that has required systemic treatment in past 2 years . Active autoimmune disease requiring systemic treatment in past 2 years Active autoimmune disease that has required systemic treatment in past 2 years (replacement therapy is not considered a form of systemic treatment Active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease that has required systemic treatment in past 2 years; replacement therapy is not considered a form of systemic treatment Active or prior documented autoimmune disease within the past 2 years Active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease that has required systemic therapy in the past 2 years with modifying agents, corticosteroids, or immunosuppressive agents Active or prior documented autoimmune disease within the past 2 years. Has an autoimmune disease that has required systemic treatment in the past 2 years with use of disease modifying agents, corticosteroids, or immunosuppressive drugs Active or prior documented autoimmune disease within the past 2 years Autoimmune disease that has required systemic treatment in past 2 years Has an active autoimmune disease that has required systemic treatment in past 2 years Has active autoimmune disease that has required systemic treatment in the past 2 years. Replacement therapy is not considered a form of systemic treatment. Has an active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Has an active autoimmune disease that has required systemic treatment in past 2 years Active autoimmune disease that has required systemic treatment in the past 3 months. Active or prior documented autoimmune disease within the past 3 years Active or prior documented autoimmune disease within the past 2 years Active or prior documented autoimmune disease within the past 2 years Active or prior autoimmune disorder within the past 2 years Ongoing or recent (within 5 years) evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments Has an active autoimmune disease that has required systemic treatment in the past 2 years. Replacement therapy is not considered a form of systemic treatment. Active autoimmune disease requiring systemic therapy in past 2 years (IMGN853 and pembrolizumab only) Has an active autoimmune disease that has required systemic treatment in past 2 years. History or evidence of active autoimmune disease that has required systemic treatment in the past 2 years (ie, with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Active autoimmune disease that required systemic treatment in the past. Has an active autoimmune disease that has required systemic treatment in the past 2 years (e.g., with use of disease modifying agents, corticosteroids, or immunosuppressive drugs). Active autoimmune disease that required systemic treatment in the past 2 years Has active autoimmune disease that has required systemic treatment in the past 2 years (i.e., with the use of disease modifying agents, corticosteroids, or immunosuppressive drugs).