The study is being conducted to evaluate the safety and tolerability of HRS-4642 in patients with advanced solid tumors harboring KRAS G12D mutation.To estimate the maximum tolerated dose (MTD) and/or a biologically active dose (eg, recommended phase 2 dose [RP2D]) within investigated subject population groups

Inclusion Criteria:

1. Subjects must voluntarily agree to participate in the trial and sign a written informed consent form.
2. Male or female ≥ 18 years old.
3. Histologically confirmed diagnosis of advanced solid tumor harbouring with KRAS G12D mutation
4. ECOG performance status of 0-1.
5. With a life expectancy of ≥3 months.
6. Have at least one measurable lesion.
7. Adequate laboratory parameters during the screening period

Exclusion Criteria:

1. Previously received KRAS G12D inhibitors
2. Priot radiotherapy within 28 days for non-thoracic radiation
3. Prior anti-tumor chemotherapy (< 6 weeks if chemotherapy including nitrosoureas or mitomycin) within 4 weeks before the study drug administration
4. Any unresolved AEs > Common Terminology Criteria for Adverse Events (CTCAE) Grade 1 or inclusion/exclusion criteria level (The investigators determined that safe and controllable toxicity was excluded, such as alopecia and ≤ grade 2 peripheral neuropathy ).
5. Central nervous system (CNS) metastases
6. Major surgical therapy within 28 days prior to the date of signature of informed consent form, or expected major surgery during the study.
7. Known history of hypersensitivity to any components of HRS-4642.
8. Other factors that may affect the study results or lead to forced termination of the study early as judged by investigators.