SSGJ-709-101

1) Minimum life expectancy of 3 months.

2) Eastern Cooperative Oncology Group (ECOG) Performance status (PS) score of 0-1.

3) Locally advanced or metastatic malignant tumors confirmed by histopathology or cytology; preferred tumor types for enrollment include head and neck squamous cell carcinoma, non-small cell lung cancer, esophageal squamous cell carcinoma or adenocarcinoma, gastric or gastroesophageal junction adenocarcinoma, colorectal adenocarcinoma, hepatocellular carcinoma, urothelial carcinoma, and clear cell renal cell carcinoma. Subjects with other tumor types may be enrolled after discussion with the sponsor.

4) Subject who have failed, or has been intolerant to standard therapy, or has been considered lack standard of care for a given tumor type, and who is not able to complete surgical resection and receive curative concurrent/sequential chemoradiotherapy.

5) Having at least one measurable tumor lesion as the target lesion assessed per RECIST v1.1.

6) The subject has adequate hematological and organ functions.

1) Presence of brainstem, meningeal metastases, spinal cord metastases or compression.

2) Presence of active central nervous system (CNS) metastases.

3) Subjects with pleural effusion, pericardial effusion, or ascites that are clinically symptomatic or require repeated drainage.

4) Subjects with other malignant tumors within 3 years prior to screening.

5) Subjects with autoimmune diseases that require systemic treatment within 2 years before screening.

6) Subjects are positive for human immunodeficiency virus (HIV).

7) Prior or current presence of non-infectious pneumonia/interstitial lung disease requiring systemic therapy with glucocorticoids.

8) Serious infection within 4 weeks prior to the first dose or the presence of any active infection requiring systemic anti-infective therapy.

9) Having received the following treatments prior to the first dose of study treatment:
|— a) Having received anti-tumor therapies such as biological agents, chemotherapy and other investigational drugs not approved for marketing within 3 weeks prior to the first dose of study treatment (Patient may be enrolled if the first dose of study treatment is more than 5 half-lives of the drug from the last anti-tumor therapy).
|— b) Having received small molecule targeted antineoplastic agents (e.g., tyrosine kinase inhibitor), or palliative local therapy for non-target lesions, or non-specific immunomodulatory therapy (e.g., interleukin, interferon, thymosin, tumor necrosis factor) within 2 weeks prior to the first dose.
|— c) Having received herbal medicine with an anti-tumor indication within 1 week prior to the first dose.
|— d) Prior immunotherapy other than anti-PD-(L)1 therapy (Patients with prior immunotherapy against other targets may be enrolled after discussion and agreement with the sponsor).

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