A First-in-Human, Open Label, Phase I Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Preliminary Antitumor Activity of FZ-AD005 in Patients with Advanced Solid Tumors.

Inclusion Criteria:

1. Patients able to give written informed consent;
2. Age ≥ 18 and ≤ 75 years old, male or female;
3. Patients have histological or cytological diagnosis with advanced solid tumors ( especially SCLC or LCNEC);
4. Willingness to provide tumor tissue for testing ;
5. Have measurable lesions defined in RECIST v. 1.1;
6. Expected survival ≥ 3 months;
7. Eastern Cancer Cooperative Group (ECOG) performance status 0-1;
8. Patients of child bearing potential must agree to take contraception during the study and for 6 months after the last day of treatment.

Exclusion Criteria:

1. Patients who have had previous treatment with any anti-DLL3 antibody；
2. Have had other malignant tumors in the past 5 years;
3. Patients who are receiving other anti-tumor treatments within 4 weeks prior to the first dose;
4. Have active CNS (central nervous system) metastasis；
5. Had undergone major surgery or severe trauma within 4 weeks prior to the first dose;
6. Had undergone systemic high-dose steroids within 2 weeks of initiation of study treatment;
7. Patients have psychiatric history;
8. Female patients who are breastfeeding or pregnant;
9. Other reasons that researchers believe are inappropriate to participate in this study.