This is an open-label, multicenter, dose-escalation phase I study to assess the safety, tolerability and preliminary efficacy of KN046 in participants with all advanced solid tumors who are not able to have current standard anti-tumor therapies. The purpose of this study is to determine the maximum tolerated dose (MTD) or a biological effective dose (BED), to characterise the safety, pharmacokinetics (PK), immunogenicity, pharmacodynamics (PD) and anti-tumor activity of KN046 as a single agent in adult participants with advanced solid tumors

Inclusion Criteria:

1. The subject must sign the informed consent form prior to the conduct of any study related procedures that are required during the screening period and are not considered part of standard of care.
2. Subjects must have histologic or cytologic confirmed Advanced solid tumors.
3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
4. Adequate organ function within 3 weeks prior to initial treatment.
5. Ability to comply with treatment, procedures and PK sample collection and the required study follow-up procedures.
6. Female patients and males with partners of childbearing potential should be using highly effective contraceptive measures (failure rate of less than 1% per year). Contraception should be continued for a period of 24 weeks after dosing has been completed.
7. Female patients must have a negative serum or urine pregnancy test
8. Female patients must not be breastfeeding.

Exclusion Criteria:

1. Subjects with brain metastases or leptomeningeal are excluded.
2. Concurrent enrollment in another clinical study, unless in a follow-up period or the study is an observational or non-interventional study.
3. Any kind of immunotherapy within 6 weeks of the first dose of study treatment.
4. Prior systemic cytotoxic chemotherapy, other anticancer drugs or growth factor within 28 days of the first dose of study treatment, or any investigational agents within 5 half-lives of the product.
5. Major surgical procedure (excluding placement of vascular access) or significant traumatic injury within 4 weeks of the 1st dose of study treatment, or have an anticipated need for major surgery during the study.
6. Palliative radiotherapy with a wide field of radiation within 4 weeks or radiotherapy with a limited field of radiation for palliation within 2 weeks of the 1st dose of study treatment.
7. Prior treatment or with sequential monotherapy with anti-CTLA-4 and anti-PD-1/PD-L agents.
8. Patients who have received monotherapy with PD-L1 / PD-1, CTLA4 or other antibodies and had intolerable toxicity or required steroids to manage toxicity.
9. History of autoimmune or inflammatory disorders.
10. A current or prior use of immunosuppressive medication within 14 days of the 1st dose of study treatment.
11. Suspected latent tuberculosis infection, confirmed by Mantoux test and a chest x-ray.
12. Any unresolved toxicity NCI CTCAE (National Cancer Institute Common Terminology Criteria for Adverse Events) Grade ≥2 from previous anticancer therapy with the exception of alopecia, vitiligo, and the laboratory values defined in the inclusion criteria
13. Any factors that increase the risk of QT (ECG interval measured from the onset of the QRS complex to the end of the T wave) interval corrected for heart rate (QTc) prolongation or risk of arrhythmic events (e.g., heart failure, hypokalemia, congenital long QT syndrome, family history of long QT syndrome or unexplained sudden death under 40 years of age) or mean QTc>470 msec.
14. Positive blood screen for hepatitis B surface antigen (HBsAg), hepatitis C antibody (HCV Ab), or human immunodeficiency virus 1/2 antibody (HIV 1/2 Ab).
15. History of severe allergic reactions to any unknown allergens or to parenteral administered recombinant protein product.