Study of ADCT-502 in Patients With Advanced Solid Tumors Withhuman Epidermal Growth Factor Receptor-2 (HER2) Expression

Main Inclusion Criteria:

Male or female age 18 years or older
Refractory to or intolerant of existing therapy(ies) known to provide clinical benefit for their condition.
Eastern Cooperative Oncology Group (ECOG) performance status: Part 1: 0-2, Part 2: 0-1
Availability of formalin-fixed paraffin-embedded (FFPE) tumor tissue block or unstained slides to demonstrate HER2 expression.
Pathologic diagnosis of solid tumor malignancy that is locally advanced or metastatic at time of Screening with documented HER2 expression.
Part 2/Dose Expansion Only: Measurable disease as defined by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1
Absolute neutrophil count (ANC) ≥ 1500/mm3 (≥1.5× 109/L).
Platelet count ≥100,000 //mm3 (≥100 × 109/L).
Hemoglobin ≥ 9 g/L (≥5.6 mmol/L).
Aspartate transaminase (AST) and alanine aminotransferase (ALT) ≤ 2.5 x upper limit of normal (ULN); or ≤ 5.0 × ULN if liver metastases are present.
Total bilirubin ≤ 1.5× ULN (or ≤ 3× ULN, with direct bilirubin ≤1.5 × ULN, in participants with known Gilbert syndrome).
Creatinine ≤ 1.5× ULN; or, if serum creatinine > 1.5 × ULN, a measured creatinine clearance must be >60mL/min/1.73m2 as calculated by the Cockcroft and Gault equation for participants to be eligible.
Women of childbearing potential must agree to use a highly effective method of contraception from the time of giving informed consent until at least 16 weeks after the last dose of ADCT-502. Men with female partners who are of childbearing potential must agree that they or their partners will use a highly effective method of contraception from the time of giving informed consent until at least 16 weeks after the participant receives his last dose of ADCT-502.

Main Exclusion Criteria:

Known history of ≥ Grade 3 hypersensitivity to a therapeutic antibody.
Known history of positive serum human anti-drug antibody (ADA) to trastuzumab.
Major surgical procedure or significant traumatic injury, radiotherapy, chemotherapy, targeted therapy, hormone therapy, or other anticancer therapy.
Failure to recover to Grade 0 or Grade 1 from acute non-hematologic toxicity due to previous therapy, prior to screening (with the exception of alopecia).
Central Nervous System (CNS) disease only.
Symptomatic CNS metastases or evidence of leptomeningeal disease.
Active cardiovascular disease or significant history thereof.
Other active disease including but not limited to ulceration of the upper gastrointestinal tract, autoimmune disease, HIV infection, active Hepatitis B virus (HBV) and hepatitis C virus (HCV) infection.
Breastfeeding or pregnant.
Other concurrent severe and/or uncontrolled medical conditions.