To evaluate the safety, tolerability, pharmacokinetics and preliminary efficacy of SPH6516 tablets in the treatment of advanced solid tumors.

Inclusion Criteria:

1. Advanced solid tumors;
2. The ECOGscore is 0 to 1.
3. Expected survival ≥3 months.
4. Good organ function before first use of the investigational drug.
5. Any toxicity associated with previous antitumor therapy must have returned to ≤ grade 1.
6. Voluntarily participate in this clinical trial, understand the research procedures and be able to sign the informed consent in person.

Exclusion Criteria:

1. Subjects who have received certain treatment in the prescribed period prior to their first medication;
2. Subjects who have undergone major surgery within 6 weeks before the first medication, or who plan to undergo major surgery within 12 weeks after the first medication;
3. Subjects who have participated in any other clinical trials and received treatment within 4 weeks prior to the first medication;
4. Subjects with third space fluid accumulation that cannot be controlled by drainage or other methods; Subjects with factors affecting drug administration and absorption;
5. Subjects with allergic constitution or a history of severe allergies;
6. Subjects with active hepatitis B virus (HBV) infection, active hepatitis C virus (HCV) infection, or a history of immunodeficiency;
7. Subjects with a history or evidence of high risk cardiovascular disease;
8. Subjects with severe lung disease;
9. Pregnant and lactating female subjects; Female subjects of childbearing age or male subjectswith fertile partners who were unwilling to take effective contraceptive measures throughout the entire trial period;
10. Subjects with a clear history of neurological or psychiatric disorders;
11. Other situations in which the investigator did not consider it appropriate to participate in the study.