Documented allergy to DMSO, mouse or bovine proteins, or iron. Known allergy or intolerance to any component of belimumab, including human or murine proteins or monoclonal antibodies History of allergy to mouse proteins Known allergy to murine proteins or have had a documented anaphylactic reaction to any drug, or a known hypersensitivity to diphenhydramine or other antihistamines of similar chemical structure. History of allergy to mouse proteins History of allergy to mouse proteins Patients who are known to have allergy to mouse proteins History of allergy to mouse proteins History of allergy to mouse proteins History of prior ? grade 3 hypersensitivity reaction or any toxicity attributed to trastuzumab or murine proteins that warranted permanent cessation of these agents (applicable for Cohort 1 only). Allergies or hypersensitivity to murine, chimeric, human or humanised proteins History of severe environmental allergies or allergy to egg proteins History of allergy to egg proteins hypersensitivity to trastuzumab, murine proteins, fulvestrant, or to any of the excipients Known anaphylaxis or IgE-mediated hypersensitivity to murine proteins or to any component of rituximab History of allergy to murine proteins History of allergy to murine proteins History of allergy to mouse proteins Known anaphylaxis or immunoglobulin E (IgE)-mediated hypersensitivity to murine proteins or to any component of rituximab Known hypersensitivity to murine or chimeric antibodies or proteins History of intolerance (including grade 3 or 4 infusion reactions) to murine proteins Known anaphylaxis or IgE-mediated hypersensitivity to murine proteins or to any component of rituximab. History of intolerance, including Grade 3 to 4 infusion reaction or hypersensitivity to trastuzumab or murine proteins or any components of the product Patients with known hypersensitivity to mouse proteins (murine antibodies in ISOLEX) if receiving soybean agglutinin and E-rosetting (SBA-E) bone marrow, or chicken egg products The patient has known hypersensitivity to bovine proteins Patients with known hypersensitivity to mouse proteins (murine antibodies in ISOLEX) if receiving T-cell depleted (soybean lectin agglutination [SBA]-E)- bone marrow, or chicken egg products Patient has a known hypersensitivity to dimethyl sulfoxide (DMSO) or murine or bovine proteins. Known anaphylaxis or IgE-mediated hypersensitivity to murine proteins or to any component of rituximab (Rituxan®) History of severe environmental allergies or allergy to egg proteins Type I hypersensitivity or anaphylactic reactions to murine proteins or to previous infusion of rituximab History of intolerance (including grade 3 or 4 infusion reaction) or hypersensitivity to trastuzumab or murine proteins Known unmanageable allergies, hypersensitivity, intolerance to monoclonal antibodies, to murine, chimeric, human proteins or their excipients Subjects allergic to infliximab, inactive components of infliximab, murine proteins and methylprednisolone Prior history of hypersensitivity to milk proteins Patients with a history of allergy to human proteins Documented allergy to iron dextran or murine proteins Prior exposure to murine proteins or chimeric antibodies