A Study of ASP3082 in Adults With Previously Treated Solid Tumors

• Status: Not yet recruiting
• Trial end date: 2026-06-30
• Target enrollment: 0
• Participant gender: All

Summary

ASP3082 is a potential new treatment for people with certain solid tumors. Before ASP3082 is available as a treatment, the researchers need to understand how it is processed by and acts upon the body. This information will help find a suitable dose and check for potential medical problems from the treatment.

People in this study will be adults with locally advanced or metastatic solid tumors with changes in their KRAS gene (G12D mutation). Metastatic means the cancer has spread to other parts of the body. They will have been previously treated with all available standard therapies.

There are 2 main aims of this study. The first is to learn if people with certain solid tumors have any medical problems after receiving different doses of ASP3082. The second is to find a suitable dose of ASP3082 to use in future studies.

This study will be in 2 parts. In Part 1, different small groups of people will receive lower to higher doses of ASP3082. Any medical problems will be recorded at each dose. This is done to find suitable doses of ASP3082 to use in Part 2 of the study. The first group will receive the lowest dose of ASP3082. A medical expert panel will check the results from this group and decide if the next group can receive a higher dose of ASP3082. The panel will do this for each group until all groups have taken ASP3082 or until suitable doses have been selected for Part 2.

In Part 2, other different small groups of people will receive ASP3082 with the most suitable doses worked out from Part 1. This will help find a more accurate dose of ASP3082 to use in future studies.

ASP3082 will be given through a vein. This is called an infusion. Each treatment cycle is 21 days long. They will continue treatment until: they have medical problems from the treatment; their cancer gets worse; they start other cancer treatment; they ask to stop treatment; they do not come back for treatment.

People will visit the clinic on certain days during their treatment, with extra visits during the first 2 cycles of treatment. During these visits, the study doctors will check for any medical problems from ASP3082. At some visits, other checks will include a medical examination, laboratory tests and vital signs. Vital signs include temperature, pulse, breathing rate, and blood pressure. Also, blood and urine samples will be taken. Tumor samples will be taken during certain visits during treatment and when treatment has finished.

People will visit the clinic within 7 days after stopping treatment. The study doctors will check for any medical problems from ASP3082. Other checks will include a medical examination, laboratory tests and vital signs. Then, they may visit the clinic at 30 days and 90 days after stopping treatment. At the 30-day visit, the study doctors will check for any medical problems from ASP3082. People will have their vital signs checked and have some laboratory tests. At the 90-day visit, the study doctors will check for any medical problems from ASP3082 and people will have their vital signs checked. After this, people will continue to visit the clinic every 9 weeks. This is to check the condition of their cancer. They will do this until 45 weeks after treatment stopped, their cancer is worse, they start other cancer treatment, they ask to stop treatment, or they do not come back for treatment.

• Phase: Phase 1
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: Astellas Pharma Inc

Criteria

Inclusion Criteria:

• Participant has locally advanced (unresectable) or metastatic solid tumor malignancy with documented Kirsten rat sarcoma viral oncogene homolog [KRAS] G12D mutation and has progressed after receiving all available standard approved therapies (no limit to the number of prior treatment regimens). If KRAS mutation status is unknown, an archival tumor sample can be sent to the central lab during the prescreening/screening period.

• Participant consents to provide tumor specimen in a tissue block or unstained serial slides or a tumor biopsy (core needle biopsy or excision) obtained after the last interventional treatment, but not more than 56 days prior to start of investigational product (IP). Participant also consents to provide a sample for tumor biopsy during the treatment period as indicated in the Schedule of Assessments.

• Participant has at least 1 measurable lesion per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1. Lesions situated in a previously irradiated area are considered measurable if progression has been demonstrated in such lesions.

• Participant has an ECOG performance status of 0, 1 or 2.

• Participant's last dose of prior antineoplastic therapy, including any immunotherapy, was 21 days or 5 half-lives, whichever is shorter, prior to initiation of IP administration.

• Participant has completed any radiotherapy (including stereotactic radiosurgery) at least 14 days prior to the start of IP administration. Participants must have recovered from all radiation-related toxicities, not require corticosteroids (NOTE: Physiologic replacement dose of hydrocortisone or its equivalent [defined as up to 30 mg per day of hydrocortisone, 2 mg per day of dexamethasone, or up to 10 mg per day of prednisone] is permitted), and not have had radiation pneumonitis. A 1-week washout is permitted for palliative radiation (<= 2 weeks of radiotherapy) to non-central nervous system disease.

• Participant's adverse events [AEs] (excluding alopecia) from prior therapy have improved to grade 1 or baseline within 14 days prior to start of IP.

• Participant has adequate organ function as indicated by protocol laboratory value parameters (If a participant has received a recent blood transfusion, the laboratory tests must be obtained >= 28 days after any blood transfusion.).

• Female participant is not pregnant and at least 1 of the following conditions apply:

• Not a woman of childbearing potential (WOCBP).

• WOCBP who agrees to follow the contraceptive guidance from the time of informed consent through at least 6 months after IP administration.

• Female participant must agree not to breastfeed starting at screening and throughout the study period and for 6 months after IP administration.

• Female participant must not donate ova starting at first dose of IP and throughout the study period and for 6 months after IP administration.

• Male participant with female partner(s) of childbearing potential (including breastfeeding partner) must agree to use contraception throughout the treatment period and for 3 months after IP administration.

• Male participant must not donate sperm during the treatment period and for 3 months after IP administration.

• Male participant with pregnant partner(s) must agree to remain abstinent or use a condom for the duration of the pregnancy throughout the study period and for 3 months after IP administration.

• Participant agrees not to participate in another interventional study while receiving IP (Participants who are currently in the follow-up period of an interventional clinical trial are allowed).

Exclusion Criteria

• Participant has received investigational therapy within 21 days or 5 half-lives, whichever is shorter, prior to start of IP.

• Participant has symptomatic or untreated central nervous system (CNS) metastases. Participants with asymptomatic, treated CNS metastases are eligible if they have been off corticosteroids and antiepileptic drugs for at least 14 days prior to start of IP.

• Participant has leptomeningeal disease as a manifestation of the current malignancy.

• Participant has a prior malignancy active (i.e., requiring treatment or intervention) within the previous 2 years, except for local malignancies that have been apparently cured, such as basal or squamous cell skin cancer, superficial bladder cancer or carcinoma in situ of the cervix or breast, which are allowed.

• Participant has a known or suspected hypersensitivity to ASP3082 or any components of the formulation used.

• Participant with known history of positive hepatitis B surface antigen or isolated hepatitis B core antibody (including acute hepatitis B virus [HBV] or chronic HBV) or hepatitis C virus [HCV] (ribonucleic acid [RNA] detected by qualitative assay). HCV RNA testing is not required in participants with negative HCV antibody testing.

• Participant has a known history of human immunodeficiency virus [HIV] infection. No HIV testing is required unless mandated by a local health authority.

• Participant has had a myocardial infarction or unstable angina within 6 months prior to the start of IP or currently has an uncontrolled illness including, but not limited to symptomatic congestive heart failure, clinically significant cardiac disease, unstable angina pectoris, cardiac arrhythmia, complete left bundle branch block, obligate use of a cardiac pacemaker, long QT syndrome, or right bundle branch block with left anterior hemiblock (bifascicular block).

• Participant has a corrected QT interval (single electrocardiogram [ECG]) using Fridericia's formula (QTcF) > 450 milliseconds (msec) during screening. ECGs will be performed in triplicate during screening.

• Participant has received prior treatment with a specific KRAS G12D inhibitor.

• Participant has an infection requiring systemic therapy (e.g., intravenous antibiotics) within 14 days prior to IP.

• Participant is expected to require another form of antineoplastic therapy while on study treatment.

• Participant has any condition which makes the participant unsuitable for study participation (such as psychiatric illness/social situations that would limit compliance with study requirements).

• Participant has known history of COVID-19 positive polymerase chain reaction (PCR) test within 4 weeks prior to the start of study treatment.

• Participant has had major surgery within 4 weeks prior to first dose of IP.