T-Cell Therapy for Advanced Breast Cancer

Inclusion Criteria:

Patients aged ≥18 years with metastatic breast cancer
Karnofsky performance status ≥70%

Patients with breast cancer that is pathologically confirmed at MSKCC (pathology from outside institutions is acceptable for the screening phase of the protocol) and defined by the following:

HER2 negative (in cases of mixed HER2 results, the most recent pathology results considered reflective of the active cancer will be considered)
Previously treated with at least 1 chemotherapy regimen for metastatic disease and documented progression

Expression of mesothelin must be confirmed by meeting 1 of the following criteria:

Mesothelin expression (>10% of the tumor expressing mesothelin) by IHC
Elevated serum SMRP levels (>1.0 nM/L)
Presence of measurable or evaluable disease

Chemotherapy, targeted therapy (such as a tyrosine kinase inhibitor), or radiotherapy must have been completed at least 14 days before administration of T-cells. Prior immunotherapy with checkpoint blockade (i.e., PD1 inhibitor, PDL1 inhibitor, or CTL4-antagonist or similar agent) must have been completed more than 1 month before the T-cell infusion.

*Chemotherapy must have been completed at least 7 days prior to leukapheresis

Any major operation must have occurred at least 28 days before study enrollment.
All acute toxic effects of any previous radiotherapy, chemotherapy, or surgical procedures must have resolved to grade 1 or lower according to CTCAE

Lab requirements (hematology):

White blood cell (WBC) count ≥3000 cells/mm^3
Absolute neutrophil count ≥1500 neutrophils/mm^3
Platelet count ≥100,000 platelets/mm^3

Lab requirements (serum chemistry):

Bilirubin <1.5x upper limit of normal (ULN)
Serum alanine aminotransferase/serum aspartate aminotransferase (ALT/AST) <5x ULN
Serum creatinine <1.5x ULN or Cr >1.5x ULN, but calculated clearances of >60
Negative screen for human immunodeficiency virus (HIV), hepatitis B virus (HBV) antigen, and hepatitis C virus (HCV). If testing was performed during the previous 3 months, there is no need to repeat testing, as long as documentation of results is provided to the study site. Subjects must receive counseling and sign a separate informed consent form for HIV testing.
Subjects and their partners with reproductive potential must agree to use an effective form of contraception during the period of drug administration and for 4 weeks after completion of the last administration of the study drug. An effective form of contraception is defined as oral contraceptives plus 1 form of barrier or double-barrier method contraception (condom with spermicide or condom with diaphragm).
Subjects must be able to understand the potential risks and benefits of the study and must be able to read and provide written, informed consent for the study.
Availability of archival tumor tissues (FFPE tissue block or 10-15 unstained slides)

Exclusion Criteria:

Untreated or active CNS metastases (progressing or requiring anticonvulsants or corticosteroids for symptomatic control); patients with a history of treated CNS metastases are eligible, provided that all of the following criteria are met:

Presence of measurable or evaluable disease outside of the CNS;
Radiographic demonstration of improvement upon completion of CNS- directed therapy and no evidence of interim progression between completion of CNS-directed therapy and the screening radiographic study;
Completion of radiotherapy ≥8 weeks prior to the screening radiographic study;
Discontinuation of corticosteroids and anticonvulsants ≥4 weeks prior to the screening radiographic study.
History of seizure disorder
Patients currently receiving treatment for concurrent active malignancy. Prior immunotherapy with checkpoint blockade (i.e., PD1 inhibitor, PDL1 inhibitor, or CTL4-antagonist or similar agent) must have been completed more than 1 month prior to the T-cell infusion.
Autoimmune or antibody-mediated disease, including but not limited to systemic lupus erythematosus, rheumatoid arthritis, ulcerative colitis, Crohn's disease, and temporal arteritis (patients with a history of hypothyroidism will not be excluded)
Clinically significant cardiac disease (New York Heart Association class III/IV) or severe debilitating pulmonary disease
Pregnant or lactating women
Known active infection requiring antibiotics within 7 days of the start of treatment (Day 0)
A requirement for daily systemic corticosteroids for any reason or a requirement for other immunosuppressive or immunomodulatory agents. Topical, nasal, and inhaled steroids are permitted.
Administration of live, attenuated vaccine within 8 weeks before the start of treatment (Day 0) and throughout the study
Any other medical condition that, in the opinion of the PI, may interfere with a subject's participation in or compliance with the study
Participation in a therapeutic research study or receipt of an investigational drug within 30 days of T-cell infusion