Study of SQZ-eAPC-HPV in Patients With HPV16+ Recurrent, Locally Advanced or Metastatic Solid Tumors

Inclusion Criteria - All Patients:

* Male or female patients ≥18 years of age
* Histologically confirmed incurable or metastatic solid tumors that are HPV16+ (performed during screening locally or centrally, or based on documented historic test results)
* Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 to 1
* At least 1 measurable lesion according to RECIST 1.1
* Must have a lesion that can be biopsied with acceptable clinical risk and agree to have a fresh biopsy at Screening and on Cycle 2 Day 8 (+/- 2 days)
* Patients must agree to venous access for leukapheresis and be willing to have a central line inserted if venous access is an issue
* Adequate organ function and bone marrow reserve performed within 14 days prior to leukapheresis

Inclusion Criteria - Part 2:

• Patients must not have been treated with immune check-point inhibitors

Exclusion Criteria - All Patients:

* Treatment with anticancer therapy, including investigational therapy, within 2 weeks prior to leukapheresis.
* Systemic treatment with either corticosteroids (\>10 mg of prednisone or the equivalent per day) or other immunosuppressive medications within 14 days prior to leukapheresis
* Patients treated with non-corticosteroid based immunosuppressive agents within the last 6 months prior to leukapheresis
* Patients with active, known, or suspected autoimmune disease may not be eligible and should be discussed with the Sponsor
* Patients with \>Grade 1 AEs related to previous treatment with anticancer or investigational therapy that do not resolve at least 2 weeks prior to leukapheresis, except Grade 2 neuropathy, ototoxicity, mucositis, fatigue, alopecia, or endocrine disorders managed with hormone replacement
* Known HIV infection, active hepatitis B or hepatitis C, or active mycobacterium tuberculosis infection
* Has known active central nervous system metastases
* Have active interstitial lung disease and any history of myocarditis
* Major surgery within 2 weeks of leukapheresis

Exclusion Criteria - Part 1B:

* Known hypersensitivity to pembrolizumab
* History of any Grade 3 immune-related AE (irAE) from prior immunotherapy

Exclusion Criteria - Part 2:

• Prior treatment with an immune check-point inhibitor