CF33-hNIS-antiPDL1 for the Treatment of Metastatic Triple Negative Breast Cancer

Prior treatment

• Chemotherapy, biological therapy, immunotherapy or investigational therapy within 14 days prior to day 1 of protocol therapy
• Major surgery or radiation therapy within 28 days of study therapy
• Has received a vaccination within 30 days of first study injection
• Patients may not have clinically unstable brain metastases. Patients may be enrolled with a history of treated brain metastases that are clinically stable for \>= 4 weeks prior to start of study treatment

Other illness

• History of allergic reactions attributed to compounds of similar chemical or biologic composition to study agent
• Clinically significant uncontrolled illness
• Active infection requiring antibiotics
• Known history of immunodeficiency virus (HIV)
• Patients with a known history of hepatitis B or hepatitis C infection who have active disease as evidenced by hepatitis (Hep) B surface antigen status or Hep C polymerase chain reaction (PCR) status obtained within 14 days of cycle 1, day 1
• Another malignancy within 3 years, except non-melanomatous skin cancer
• Any other condition that would, in the Investigator's judgment, contraindicate the patient's participation in the clinical study due to safety concerns with clinical study procedures

Other

• Females only: Pregnant or breastfeeding
• Prospective participants who, in the opinion of the investigator, may not be able to comply with all study procedures (including compliance issues related to feasibility/logistics)

• Documented informed consent of the participant and/or legally authorized representative
  • Assent, when appropriate, will be obtained per institutional guidelines
• Agreement to research biopsies on study, once during study and end of study, exceptions may be granted with study principal investigator (PI) approval
• \>= 18 years
• Eastern Cooperative Oncology Group (ECOG) =\< 2
• Histologically confirmed metastatic triple negative breast cancer. Triple negative status will be defined as estrogen receptor (ER) and progesterone receptor (PR) =\< 10% by immunohistochemistry (IHC) and HER2 negative, per American Society of Clinical Oncology/College of American Pathologists (ASCO/CAP) guidelines
• Measurable disease by RECIST 1.1
• Patients must have progressed on or been intolerant of at least 2 prior lines of therapy for advanced/metastatic disease. Patients that qualify for immunotherapy and/or PARP inhibitors must have progressed on or been intolerant of these agents
• Fully recovered from the acute toxic effects (except alopecia) to =\< grade 2 to prior anti-cancer therapy
• Must have a superficial tumor (cutaneous, subcutaneous), breast lesion or nodal metastases amenable to safe repeated intratumoral injections per treating physician and interventional radiologist review
• Absolute neutrophil count (ANC) \>= 1,500/mm\^3
  • NOTE: Growth factor is not permitted within 14 days of ANC assessment unless cytopenia is secondary to disease involvement
• Platelets \>= 100,000/mm\^3
  • NOTE: Platelet transfusions are not permitted within 14 days of platelet assessment unless cytopenia is secondary to disease involvement
• Total bilirubin =\< 1.5 X upper limit of normal (ULN)
• Aspartate aminotransferase (AST) =\< 2.5 x ULN
  • If liver metastases are present: AST =\< 5 x ULN
• Alanine aminotransferase (ALT) =\< 2.5 x ULN
  • If liver metastases are present: ALT =\< 5 x ULN
• Serum creatinine =\< 1.5 mg/dL or creatinine clearance of \>= 50 mL/min per 24 hour urine test or the Cockcroft-Gault formula
• Prothrombin (PT) =\< 1.5 x ULN
• Activated partial thromboplastin time (aPTT) =\< 1.5 x ULN
• Women of childbearing potential (WOCBP): negative serum pregnancy test
• Agreement by females and males of childbearing potential\* and their partners to use an effective method of birth control (defined as a hormonal or barrier method) or abstain from heterosexual activity for the course of the study through at least 6 months after the last dose of protocol therapy
  • Childbearing potential defined as not being surgically sterilized (men and women) or have not been free from menses for \> 1 year (women only)