The Evaluation of PC14586 in Patients With Advanced Solid Tumors Harboring a p53 Y220C Mutation (PYNNACLE)

Open to people ages 12 years and up

• At least 18 years of age or 12 to 17 years of age after adequate adult safety data become available
• Advanced solid malignancy with a TP53 Y220C mutation
• Eastern Cooperative Oncology Group (ECOG) status of 0 or 1
• Previously treated with one or more lines of anticancer therapy and progressive disease

• Adequate organ function

  Additional Criteria for Inclusion in Phase 1b (PC14586 + pembrolizumab combination)

• Anti-PD-1/PD-L1 naive or must have progressed on treatment
• Measurable disease

• Anti-cancer therapy within 21 days (or 5 half-lives) of receiving the study drug
• Radiotherapy within 28 days of receiving the study drug
• Primary CNS tumor (Phase 1, Phase 2 Cohort A)
• History of leptomeningeal disease or spinal cord compression
• Brain metastases, unless neurologically stable and do not require steroids to treat associated neurological symptom
• Stroke or transient ischemic attack within 6 months prior to screening
• Heart conditions such as unstable angina, uncontrolled hypertension, a heart attack within 6 months prior to screening, congestive heart failure, prolongation of QT interval, or other rhythm abnormalities
• Strong CYP3A4 inhibitors or inducers, medications with a known risk of QT/QTc prolongation, or proton pump inhibitors
• History of gastrointestinal (GI) disease that may interfere with absorption of study drug or patients unable to take oral medication
• History of prior organ transplant
• Known, active malignancy, except for treated cervical intraepithelial neoplasia, or non-melanoma skin cancer

• Known, active uncontrolled Hepatitis B, Hepatitis C, or human immunodeficiency virus infection

  Additional Criteria for Exclusion from Phase 1b (PC14586 + pembrolizumab combination)

• Received prior therapy with an anti-PD-1, anti-PD-L1, or anti-PD-L2 agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor and discontinued from that treatment due to a Grade 3 or higher immune-related AE (irAE).
• Received a live or live-attenuated vaccine within 30 days prior to the first dose of study intervention.
• Diagnosis of immunodeficiency or receiving chronic systemic steroid therapy within 7 days prior to the first dose of study drug.
• Hypersensitivity (≥ Grade 3) to pembrolizumab and/or any of its excipients.
• Active autoimmune disease that has required systemic treatment in past 2 years.
• History of radiation pneumonitis.
• History of (non-infectious) or active pneumonitis / interstitial lung disease that required steroids
• Active infection requiring systemic therapy.
• Known history of HIV infection.