A Study of NT-175 in Adult Subjects With Unresectable, Advanced, and/or Metastatic Solid Tumors That Are Positive for HLA-A*02:01 and the TP53 R175H Mutation

Key Inclusion Criteria

• Subjects must be at least 18 years of age, at the time of signing the informed consent.

• Subjects must be capable of giving signed informed consent.

• Subject must be diagnosed with one of the histologies below:

• NSCLC

• Colorectal adenocarcinoma

• HNSCC

• Pancreatic adenocarcinoma

• Breast cancer

• Ovarian cancer

• Any other solid tumor

• Tumors must harbor a TP53 R175H variant mutation and subject must be HLA-A*02:01 positive (at least 1 allele) as confirmed by an CLIA-accredited laboratory-based test.

• Subject has advanced solid cancer, defined as unresectable, advanced, and/or metastatic disease (Stage III or IV) after at least 1 line of approved systemic standard of care (SOC) treatment regimen and for which there are no available curative treatment options.

• Subject has at least 1 measurable lesion per computed tomography (CT) scan or magnetic resonance imaging (MRI) per RECIST version 1.1.

• Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1 at the time of enrollment

• Adequate hematological, renal, hepatic, pulmonary, and cardiac function

• Per Investigator judgement, subject is likely to complete study visits and/or procedures per the protocol and comply with study requirements for study participation

Key Exclusion Criteria

• Any another primary malignancy within the 3 years prior to enrollment (except for non-melanoma skin cancer, carcinoma in situ (eg, cervix, bladder, breast) or low-grade prostate cancer

• Known, active primary central nervous system (CNS) malignancy

• History of prior adoptive cell and gene therapy, allogeneic stem cell transplant or solid organ transplantation.

• History of stroke or transient ischemic attack within the 12 months prior to enrollment.

• History of clinically significant cardiac disease within the 6 months prior to enrollment or heart failure at any time prior to enrollment.

• Systemic therapy within at least 2 weeks or 3 half-lives, whichever is shorter, prior to enrollment.

• History of severe immediate hypersensitivity reaction to cyclophosphamide, fludarabine, or rIL-2; or known sensitivity or allergy to methotrexate, gentamicin, or other aminoglycosides.

• Any form of primary immunodeficiency.

• Live vaccine ≤ 4 weeks prior to enrollment or plans to have a live vaccine prior to planned lymphodepleting chemotherapy and/or NT-175 treatment.

• Active immune-mediated disease requiring systemic steroids or other immunosuppressive treatment (except if related to prior checkpoint inhibitor therapy)

• Female of childbearing potential who is lactating or breast feeding at the time of enrollment.

• Known to have Li-Fraumeni syndrome or is known to have relatives who are diagnosed with Li-Fraumeni syndrome.