This study is an open, multi-dose, dose escalation and cohort expansion, phase Ⅰ study to investigate the safety, tolerability, efficiency, pharmacokinetics, immunogenicity of SG001 in subjects with advanced tumours.

Phase Ⅰa: open, multi-dose, dose escalation. Phase Ⅰb: open, fixed-dose, cohort expansion.

Inclusion Criteria:

• Age ≥ 18 on the day of signing informed consent.
• Phase Ⅰa: Histologically/cytologically confirmed diagnosis of advanced solid tumor, and failure of standard anti-tumor treatment (disease progression or intolerance), or no standard treatment or rejection of standard treatment.

Phase Ⅰb:

Cohort A: Histologically or cytologically documented locally-advanced, relapsed or metastatic solid malignancy with PD-L1 positive and/or deficiency in mismatch repair (dMMR) / Microsatellites instability-High (MSI-H) and/or EBV positive, and has failed at least first line standard therapy or for which standard therapy is not tolerated.

Cohort B: Histologically documented relapsed or metastatic uterine cervical cancer and has failed at least first line standard therapy or for which standard therapy is not tolerated.

Cohort C: Histologically documented malignant mesothelioma, and has failed to pemetrexed-based chemotherapy or chemotherapy is not tolerated.

Cohort D: Histologically documented relapsed or refractory lymphoma, and has failed at least 2 lines standard therapy, including radiotherapy or autologous hematopoietic stem cell transplantation.

Cohort E: Histologically or cytologically documented non-small cell lung cancer without EGFR or ALK gene mutation, and has failed at least first line standard therapy or for which standard therapy is not tolerated.

• Solid tumor except malignant pleural mesothelioma will be assessed by RECIST 1.1, malignant pleural mesothelioma will be evaluated by Modified RECIST for malignant pleural mesothelioma, and lymphoma will be assessed by Lugano criteria (2014). All the subjects should have at least one measurable lesion in CT or MRI test.
• If subjects have received anti-tumor therapies before, the toxicity severity must decrease to ≤ Grade1 evaluated by CTCAE 5.0, except for residual alopecia.
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• Has a predicted survival period ≥ 3 months.
• Demonstrate adequate organ function as defined below(No anticoagulants or other drugs affecting clotting function were used within 14 days prior to the first administration. No blood transfusions were performed, no hematopoietic stimulators were used, and no drugs were used to correct blood cell counts). a) Hemoglobin (HGB)≥9 g/dL;b)Absolute neutrophil count (ANC) ≥1.5×109/L;c)Platelets ≥75×109/L;d) Serum total bilirubin (TBIL) ≤ 1.5 X upper limit of normal ULN (Subjects with Gilbert's syndrome can be up to 3 x ULN);e) Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤2.5 X ULN or ≤5 X ULN for subjects with hepatocellular carcinoma and liver metastases;f)Serum creatinine ≤1.5 X ULN or Creatinine clearance (CCr) ≥ 50mL/min;g)International Normalized Ratio (INR) and activated partial thromboplastin time (APPT) ≤1.5 X ULN.
• From signing the informed consent form to 6 months after last dose of investigational drug, subjects of childbearing potential should be willing to use reliable contraceptive methods.

Exclusion Criteria:

• History of allergic reactions attributed to any monoclonal antibody, and uncontrolled history of allergic asthma.
• Subjects with primary central nervous system tumor, or symptomatic/untreated central nervous system metastases (except for residual signs or symptoms related to CNS treatment, those with stable or improved neurological symptoms at least 2 weeks before inclusion can be included)
• Patients with any autoimmune disease, i.e., but not limited to, subjects with well-controlled type I diabetes, well-controlled hypothyroidism with hormone replacement therapy, skin diseases (such as vitiligo, psoriasis, or hair loss) without systemic treatment, or who are not expected to relapse without external triggers.
• History of primary immunodeficiency
• Patients with serious cardiovascular diseases, such as grade 2 or above heart failure, previous myocardial infarction within 3 months, poorly controlled arrhythmias or unstable angina pectoris, as rated by New York Heart Association;.
• Has history of Interstitial Lung Disease or non-infectious pneumonitis. (Patients caused by radiotherapy are eligible).
• Prior therapy with an anti-PD-1, anti-PD-L1,or anti CTLA-4 antibody ( any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways)
• Immune-related adverse events of grade 3 or higher（CTCAE 5.0）after immune therapy.
• Have received allogeneic organ transplantation or allogeneic hematopoietic stem cell transplantation.
• Any active infection requiring systemic treatment by intravenous infusion within 14 days prior to screening.
• Have received major surgery or radical radiotherapy within 28 days, or palliative radiotherapy within 14 days, or radiological agents (strontium, samarium, etc.) within 56 days prior to screening.
• Have received systemic anti-tumour therapy 28 days before the first dose, including but not limited to chemotherapy, immunotherapy, macromolecular targeted therapy, and biological therapy (tumour vaccine, cytokines or growth factors controlling cancer); Patients who received small-molecule targeted and oral fluorouracil therapy within 14 days before the first dose (or 5 half-life, whichever is longer); Patients who received mitomycin C and urea nitrite within 6 weeks before the first dose.
• Live attenuated vaccine should be given within 14 days before screening or during the study period
• Have received Chinese herbal medicine or Chinese patent medicine with anti-tumor activity within14 days prior to the screening.
• Have received whole blood transfusion or blood component transfusion within 14 days prior to screening.
• Have a history of active tuberculosis or tuberculosis.
• Active hepatitis B virus infection or syphilis, or hepatitis C virus antibody or human immunodeficiency virus (HIV) antibody positive.
• Have participated other clinical trials and received related investigated drugs within 28 days prior to the first dose of study drug.
• Pregnant or lactating women; Or the blood pregnancy test of women at child-bearing age is positive during screening.
• Have received systemic corticosteroids (at doses equivalent to or greater than 10 mg/day of prednisone) or other immunosuppressive drugs within 14 days prior to the first dose of study drug.
• Other conditions that may increase the risk of drug use in the study, or interfere with the interpretation of the study results, or affect the compliance of the study, etc.