Study sponsor: Xilio Development Inc.

Location:  HealthPartners Cancer Center at Regions Hospital, HealthPartners Frauenshuh Cancer Center

Phase of Study: I

Purpose of study: The main purpose of this study is to determine if XTX301 is safe and well-tolerated in participants with advanced solid tumors. This is the first time XTX301 is going to be given to humans, so this study will also serve to determine the recommended XTX301 dose and schedule in later clinical studies.

Inclusion Criteria:
– Patient must be at least 18 years or older at time of consent.
– Must meet the following disease criteria:
a. Part 1A – any confirmed solid tumor that is locally advanced or metastatic that has failed standard treatments, or for which there is no standard therapy available.
b. Part 1B – Locally advanced or metastatic tumor that is any of the following: Melanoma, non-small cell lung cancer (NSCLC), Head and Neck Squamous cell, Triple-negative breast (TNBC), Cervical cancer, MSI-H/dMMR colorectal, or MSI-H/dMMR endometrial cancer.

– Patient must not have received prior anticancer therapy for at least 28 days prior to starting study treatment, and must have returned to baseline or grade 1 for any side effects from previous therapy.
– Must have ECOG of 0-2.
– Patient must have adequate organ function as determined by local lab tests.
– For Part 1B only: patients must be willing to undergo a tumor biopsy before starting, and while on study treatment.
– Women of Childbearing Potential (WOCBP) must be willing to abstain from sexual activity, or use highly effective contraception. Additionally, must also have a negative serum pregnancy test at the time of study enrollment and before each dose of study drug.
– Additional criteria may apply and will be discussed with the physician and study team.

Exclusion Criteria:
– Must not have had previous treatment with IL-12 therapy
– Patients with known liver metastasis are excluded, unless previous discussion between treating physician and study medical monitor approves the patient to enroll.
– Concurrent anticancer therapy, immune therapy, or cytokine therapy, or other antineoplastic therapy during the study.
– History of significant pulmonary disease, interstitial lung disease or pulmonary fibrosis.
– History of significant heart disease, uncontrolled hypertension, congestive heart failure, or myocarditis.
– Possible area of non-disease related necrosis, such as an active ulcer, a non-healing wound, or intercurrent bone disease.
– Has active central nervus metastases, or carcinomatous meningitis.
– Active autoimmune disease that required therapy in the past 2 years, including use of corticosteroids, or immunosuppressive drugs.
– Has an active infection that requires systemic therapy within 4 weeks prior to receiving study drug.
– Has a history of Grade 3 or higher immune-related toxicities from prior immunotherapy unless it resolved within 14 days.
– Has had history of severe hypersensitivity to monoclonal antibodies
– Is pregnant or breastfeeding.
– Has active hepatitis B or C infection.
– Has had prior gene therapy treatment, organ transplant, or hematopoietic stem-cell transplant.
– Is currently using or has received another investigational drug or device within 4 weeks prior to starting study drug.
– Has received a live or live-attenuated vaccine within 4 weeks prior to first dose.
– Additional exclusion criteria may apply and will be discussed with the physician and study team.

Study Contact:
Alissa Gavenda, RN
(952) 993-6705
Alissa.Gavenda@ParkNicollet.com