Evaluate the safety, tolerability, pharmacokinetics, and immunogenicity of FH-006 in subjects with advanced malignant solid tumors, and determine the maximum tolerated dose (MTD) or maximum administered dose (MAD), recommended dose for phase II clinical trials (RP2D), and preliminary efficacy.

Inclusion Criteria:

1. Women aged 18 to 75 (inclusive)
2. Subjects with histologically or cytologically confirmed recurrent or metastatic solid tumors who experience disease progression after standard treatment, or who do not have a standard treatment plan or are not suitable for standard treatment.
3. ECOG score is 0 or 1
4. An expected survival of ≥3 months
5. At least one target lesion according to RECIST v1.1 criteria
6. Has a good level of organ function
7. Patients voluntarily joined the study and signed informed consent

Exclusion Criteria:

1. Have other malignancies within the past 5 years
2. Active central nervous system metastasis without surgery or radiotherapy
3. Presence with uncontrollable third space effusion
4. Have undergone other anti-tumor treatment within 4 weeks before the first dose
5. Has severe infection within 4 weeks before the first medication
6. Any active autoimmune disease or a history of autoimmune disease
7. A history of immune deficiency
8. Has serious cardiovascular and cerebrovascular diseases
9. Clinically significant history of lung disease
10. The toxicity from previous anti-tumor treatment has not recovered to ≤ grade I
11. Having undergone surgery on important organs within 4 weeks prior to the first use of medication
12. Used attenuated live vaccine within 28 days prior to the first use of the investigational drug
13. Presence of other serious physical or mental diseases or laboratory abnormalities