Aims to Explore the Safety, Tolerability, and Preliminary Efficacy of SCTB41 in Adult Patients with Advanced Malignant Solid Tumours.

Inclusion Criteria: 1. Voluntarily sign the informed consent form (ICF); 2. Male or female, ≥18 years old; 3. Survival duration more than 3 months; 4. ECOG score ≤ 1 point; 5. Participants in Phase Ia (dose-escalation phase) are required to meet the following criteria: histologically or cytologically confirmed diagnosis of advanced malignant solid tumour; 6. Participants in Phase Ib (dose-expansion phase) and Phase II are required to meet the following criteria: Histologically or cytologically confirmed specific type advanced malignant solid tumours; 7. Adequate organ and bone marrow function. Exclusion Criteria: 1. Participants with brainstem, meningeal, spinal metastases, orcompression; active central nervous system metastases; 2. Other malignancies diagnosed; 3. History of hypertensive crisis or hypertensive encephalopathy; presence of uncontrolled hypertension. History of arterial thrombosis or deep veinthrombosis within 6 months prior to enrollment; 4. Presence of any active autoimmune disease or a history of autoimmunedisease with an expected recurrence; 5. Received chemotherapy, immunotherapy, biologic therapy, or other antitumor treatments within 4 weeks before enrollment; 6. Need for immunosuppressive drugs within 2 weeks prior to enrollment oranticipated during the study; 7. Significant coagulopathy or other evident risk of bleeding; 8. uncontrolled effusions in the serous cavities within 4 weeks before enrollment； 9. Major surgery or significant trauma within 4 weeks prior to enrollment;presence of unhealed skin wounds, surgical sites, trauma sites, severe- Page 3 of 4 \[DRAFT\] -mucosal ulcers, or fractures, or if the Investigator deems the participantunsuitable for the study; 10. History of permanent discontinuation of immunotherapy due to immunerelated toxicity or occurrence of ≥ Grade 3 irAEs; 11. Known severe allergy to similar antibody drugs; 12. Presence of active infection； 13. History of organ transplantation or stem cell transplantation; 14. Pregnant or breastfeeding female; women of childbearing potential withpositive pregnancy test within 7 days before the enrollment; participants(including males of childbearing potential and their female partners, and females of childbearing potential and their male partners) unwilling to use medically recognized effective contraception during the study and for 6 months after treatment ends.