The purpose of this study is to examine the safety and tolerability of AZD2389 in participants with hepatic impairment and participants with normal hepatic function.

This is a single-dose, non-randomised, open-label, parallel-group study to examine the PK, fibroblast activation protein activity, safety, and tolerability of AZD2389 in participants with hepatic impairment and participants with normal hepatic function.

The study is planned to consist of:

• Cohort 1: Participants with normal hepatic function (sex-, age-, and body mass index [BMI]-matched)
• Cohort 2: Participants with mild hepatic impairment (CP A classification)
• Cohort 3: Participants with moderate hepatic impairment (CP B classification)
• Cohort 4 (Optional): Participants with severe hepatic impairment (CP C classification)

Safety, tolerability, and available plasma PK data up to 48 hours post-dose from at least 4 participants in each of the mild hepatic impairment (CP Class A) and moderate hepatic impairment (CP Class B) cohorts must have been assessed by the investigator(s), medical monitor, and sponsor prior to the decision to proceed with evaluation/recruitment of participants with severe hepatic impairment (CP Class C). Cohort 1 (normal hepatic function) will be initiated in parallel with Cohorts 2 and 3.

Inclusion Criteria:

For Hepatic:

• Participant with a diagnosis of stable hepatic impairment

For Healthy:

• Participants who are overtly healthy as determined by medical evaluation including medical history, physical examination, and laboratory tests.

All participants:

- Body weight ≥ 50 kg; BMI within the range of 18.0 to 42.0 kg/m2 (inclusive).

Exclusion Criteria:

• Participant has eGFR < 60 mL/minute/1.73 m2
• Positive test for HIV at screening
• History of severe allergy/hypersensitivity or ongoing clinically important allergy/hypersensitivity
• History of severe dermatological disorders