This study was a phase Ib study of the safety and pharmacokinetics/pharmacodynamics of F-627 once per cycle as prophylaxis therapy to chemotherapy in women with breast cancer.

The patients received the intravenous administration of the chemotherapy (docetaxol, doxorubicin and cyclophosphamide, 75 mg/m2, 50 mg/m2 and 500 mg/m2 respectively) on Day 1 and the subcutaneous injection of F-627 at 240 µg/kg and 320 µg/kg on Day 2 (approximately 24 hours after chemotherapy) each cycle for up to 6 cycles.

This study was a phase Ib study of the safety and pharmacokinetics/pharmacodynamics of F-627 once per cycle as prophylaxis therapy to chemotherapy in women with breast cancer.

This study was conducted at two centers in China and enrolled 15 patients with breast cancer receiving TAC chemotherapy (docetaxel, doxorubicin and cyclophosphamide). The patients received the intravenous administration of the chemotherapy (docetaxol, doxorubicin and cyclophosphamide, 75 mg/m2, 50 mg/m2 and 500 mg/m2 respectively) on Day 1 and the subcutaneous injection of F-627 at 240 µg/kg and 320 µg/kg on Day 2 (approximately 24 hours after chemotherapy) each cycle for up to 6 cycles. Patients will remain on study drug dose for each of the following 6 chemotherapy cycles.

Patients will remain on study drug dose for each of the following 6 chemotherapy cycles. The blood sampling will be collected for F-627 serum concentration analysis in cycle of 1 and 3.

Inclusion Criteria:

1. 18-75 years old;
2. Female with breast cancer patients after resection who planned to receive up to 6 cycles of chemotherapy (docetaxol, doxorubicin and cyclophosphamide).
3. Score 0-1 of East Cooperative Oncology Group (ECOG).
4. Absolute neutrophil count (ANC) ≥ 2.0 × 109/L, hemoglobin (Hb) ≥ 11.0 g/dl, and platelets (PLT) ≥ 100 × 109/L prior to chemotherapy;
5. Liver and kidney function tests were within normal range;
6. Left ventricular ejection fraction (LVEF) > 50%;
7. Willing to provide written informed consent and to compliant study procedure.

Exclusion Criteria:

1. Pregnancy or lactating women; female with pregnancy potential had positive pregnancy test prior to study treatment.
2. Expected survival < 12 months.
3. Patients received radiotherapy within 4 weeks prior to enrollment.
4. Patients received neoadjuvant chemotherapy prior to the resection for breast cancer.
5. Patients received bone marrow or hemopoietic stem cell transplantation;
6. Patient was with malignancy other than breast cancer.
7. Patients received G-CSF treatment within 6 weeks prior to enrollment.
8. Patient cann't tolerate the pre-treatment of chemotherapy.
9. Acute congestive heart failure, myocardial disease, or myocardial infarction diagnosed by clinical, electrocardiography, or any other medical procedure.
10. Any disease that possibly cause splenomegaly.
11. Acute infections, chronic active hepatitis B infection within 1 year (except subject with negative hepatitis B antigen prior to enrollment) or history of hepatitis C infection.
12. Patients with active tuberculosis (TB), or had ever the history of close contact with patients with TB except negative result in tuberculin test; or under TB treatment; or suspected TB by chest X-ray.
13. Known the positive result of human immunodeficiency virus (HIV) or patients with acquired immune deficiency syndrome (AIDS).
14. Patients with sickle-cell anemia.
15. Patients with alcohol abuse or drug addiction that may affect the compliance of the study.
16. Patients with allergy to proteins extracted from Escherichia coli, G-CSF, or drug excipient.
17. Patients took other investigational products within 4 weeks prior enrollment.
18. Patients with diseases or symptoms that may not be suitable to be enrolled in this study based on investigator's judgment.