A Study of TQB2930 for Injection Monotherapy or Combination Therapy in Patients With Recurrent/Metastatic Breast Cancer

Inclusion Criteria:

* Age: 18-75 years old; Eastern Cooperative Oncology Group Performance Status (ECOG PS) score: 0\~1; The expected survival is over 3 months.
* Phase Ib

  1. Advanced malignancies confirmed by cytology / histopathology, priority given to subjects with HER2 expression or amplification;
  2. Subjects with malignant tumors who have failed standard treatment or lack effective treatment;
  3. Confirmed presence of at least one evaluable lesion according to RECIST 1.1 criteria
* Phase II

  1. Hormone receptor (HR)-negative, HER2-positive breast cancer confirmed by cytology / histopathology, with evidence of local recurrence or distant metastasis, unsuitable for surgery or radiotherapy for curative purposes:
  2. Have not received systemic antitumor therapy for metastatic stage; Systemic use of endocrine therapy is permitted, but not exceed 2 lines;
  3. at least one measurable lesion that meets the RECIST 1.1 criteria.
* Major organs are functioning normally.
* Female subjects of reproductive age should agree to use contraceptive methods during the study period and until 6 months after the end of the study; Negative serum pregnancy / urine pregnancy test within 7 days prior to study enrollment and must be non-lactating subjects; Male subjects should agree to use contraception during the study and until six months after the end of the study.

Exclusion Criteria:

* Have occured other malignant tumors within 3 years prior to first dose.
* Unalleviated toxicity above Common Terminology Criteria for Adverse Events (CTCAE) grade 1 due to any prior treatment;
* Received major surgical treatment, open biopsy, or significant traumatic injury within 28 days prior to the first dose;
* Long-term unhealed wounds or fractures;
* Arterial/venous thrombosis events occurred within 6 months before the first dose;
* Have a history of psychotropic drug abuse and can't get rid of it or have mental disorders;
* Subject with any severe and/or uncontrolled disease;
* Subjects who have been treated with other antitumor agents such as chemotherapy, radiotherapy, or immunotherapy within 4 weeks prior to the first dose, within 5 half-lives of the drug;
* Have used traditional chinese medicine with anti-tumor indications approved by National Medical Products Administration (NMPA) within 2 weeks before the first dose;
* Severe bone injury due to bone metastasis;
* Subjects with untreated active brain metastases or meningeal metastases or cancerous meningitis;
* In the course of previous HER2-targeted therapy, Left Ventricular Ejection Fractions (LVEF) decreased to \<50% or absolute LVEF decreased \>15%;
* Cumulative doses of anthracyclines exceeded doxorubicin or doxorubicin liposomes \>360 mg/m2;
* Uncontrolled hypercalcemia or symptomatic hypercalcemia requires continued bisphosphonate therapy
* Patients with severe hypersensitivity after the use of monoclonal antibodies;
* Has participated in other antitumor clinical trials within 4 weeks prior to the first dose.