Injection Regimen Trial of PEG-rhG-CSF During Breast Cancer Chemotherapy

patients received a single dose of 6mg of PEG-rhG-CSF(pegfilgrastim), as a single subcutaneous injection on day 7 after chemotherapy. If FN occurs in the experimental group and the control group, reduce the dose of chemotherapy in the next course of treatment, timely change the chemotherapy regimen, and closely monitor to ensure patient safety. Record the results of routine blood follow-up and temperature curves of patients at different time periods. If WBC \>= 15 x 10\^9/L in the first chemotherapy cycle, then 3mg PEG-rhG-CSF will be used in the second chemotherapy cycle.

patients received a single dose of 6mg of PEG-rhG-CSF(pegfilgrastim), as a single subcutaneous injection on day 3 after chemotherapy. If FN occurs in the experimental group and the control group, reduce the dose of chemotherapy in the next course of treatment, timely change the chemotherapy regimen, and closely monitor to ensure patient safety. Record the results of routine blood follow-up and temperature curves of patients at different time periods. If WBC \>= 15 x 10\^9/L in the first chemotherapy cycle, then 3mg PEG-rhG-CSF will be used in the second chemotherapy cycle.