Overview

This is a first-in-human (FIH), open-label, multicenter dose escalation and expansion study of BGB-B3227, a humanized immunoglobulin G1 (IgG1) antibody. The purpose of this study is to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics, and preliminary antitumor activity of BGB-B3227 as a monotherapy or in combination with tislelizumab with or without chemotherapy in participants with selected advanced or metastatic solid tumors. The study will also identify recommended dose(s) for expansion (RDFE[s]) of BGB-B3227 administered alone and in combination with tislelizumab.

Eligibility

Inclusion Criteria:

• Histologically or cytologically confirmed locally advanced or metastatic solid tumors with a high prevalence of mucin-1 (MUC1) expression
• At least 1 measurable lesion per RECIST v1.1
• Stable Eastern Cooperative Oncology Group Performance Status of ≤ 1
• Adequate organ function
• Willing to use a highly effective method of birth control

Exclusion Criteria:

• History of prior ≥ Grade 3 Cytokine Release Syndrome (CRS)
• History of severe Infusion-Related Reactions (IRRs), allergic reactions, or hypersensitivity to any ingredients or components of the study treatments
• Infection requiring systemic (oral or intravenous) therapy ≤ 14 days before the first dose of study drug(s), or participants with symptomatic COVID-19 infection
• Active leptomeningeal disease or uncontrolled, untreated brain metastasis
• Active autoimmune disease or history of autoimmune disease(s) that may relapse

Note: Other protocol defined Inclusion/Exclusion criteria may apply.