ARTEMIS-007: HS-20093 in Patients With Extensive Stage Small Cell Lung Cancer

Inclusion Criteria: 1. At least age of 18 years at screening. 2. Pathologically diagnosed as ES-SCLC; no prior systemic therapy for ES-SCLC. 3. At least one measurable lesion according to RECIST 1.1. 4. Agree to provide fresh or archival tumor tissue and peripheral blood samples. 5. ECOG PS of 0\~1. 6. Life expectancy \>= 12 weeks. 7. Men or women should be using adequate contraceptive measures throughout the study. 8. Females subjects must not be pregnant at screening or have evidence of non-childbearing potential. 9. Signed and dated Informed Consent Form. Exclusion Criteria: Treatment with any of the following: 1. Previous or current treatment with B7-H3 targeted therapy 2. Radiotherapy with a limited field of radiation for palliation within 2 weeks, or patients received more than 30% of the bone marrow irradiation, or large-scale radiotherapy within 4 weeks prior to the first scheduled dose of HS-20093. 3. Pleural or peritoneal effusion or pericardial effusion requiring clinical intervention. 4. Major surgery within 4 weeks prior to the first dose of HS-20093. 5. Treatment with drugs that are predominantly CYP3A4 strong inhibitors or inducers or sensitive substrates of CYP3A4 with a narrow therapeutic range within 7 days of the first dose of study drug; or requiring treatment with these drugs during the study. 6. Currently receiving drugs known to prolong QT interval or may cause torsade de pointe; or requiring treatment with these drugs during the study. 2\. Spinal cord compression or brain metastases. 3. CNS metastases with symptomatic or active progression. 4. Patients with tumor invasion of surrounding vital organs and blood vessels, at risk of esophagotracheal or esophagopleural fistula. 5\. Any unresolved toxicities from prior therapy greater than Grade 2 according to CTCAE 5.0. 6\. History of other primary malignancies. 7. Inadequate bone marrow reserve or organ dysfunction 8. Evidence of cardiovascular risk. 9. Severe, uncontrolled or active cardiovascular diseases. 10. Diabetes ketoacidosis or hyperglycemia hypertonic occurring within 6 months before the first dose of the study drug, or the glycosylated hemoglobin value ≥ 7.5% in the screening period. 11\. Severe or poorly controlled hypertension. 12. Bleeding symptoms with apparent clinical significance or obvious bleeding tendency within 1 month prior to the first dose of HS-20093 13. Serious arteriovenous thrombosis events occurred within 3 months before the first dose. 14\. Severe infections occurred within 4 weeks before the first dose. 15. Patients who have received continuous glucocorticoid treatment for more than 30 days within 30 days before the first dose, or need long-term (≥ 30 days) steroid treatment, or who have other acquired and congenital immunodeficiency diseases, or have a history of organ transplantation. 16\. The presence of active infectious diseases has been known before the first dose such as hepatitis B, hepatitis C, tuberculosis, syphilis, or human immunodeficiency virus HIV infection, etc. 17\. Hepatic encephalopathy, hepatorenal syndrome, or Child-Pugh Grade B or more severe cirrhosis. 18\. Other moderate or severe lung diseases. 19. Previous history of serious neurological or mental disorders. 20. Women who are breastfeeding or pregnant or planned to be pregnant during the study period. 21\. Vaccination or hypersensitivity of any level within 4 weeks prior to the first dose of HS-20093 22. History of severe hypersensitivity reaction, severe infusion reaction or allergy to recombinant human or mouse derived proteins. 23\. Hypersensitivity to any ingredient of HS-20093. 24. Unlikely to comply with study procedures, restrictions, and requirements in the opinion of the investigator 25. Any disease or condition that, in the opinion of the investigator, would compromise subject safety or interfere with study assessments