This clinical study is a multiple center, registering and real-world conditional research. The breast cancer patients planning for chemotherapy evaluated with medium-high risk of febrile neutropenia (FN) are recruited, receiving the first level prophylactic use of PEG-rhG-CSF or the second level prophylactic use of PEG-rhG-CSF in at least two cycles of chemotherapy according to real-world clinical judgement and choice by physicians in local cancer center. Comparing real conditional-FN rate, FN-caused hospitalization rate and antibiotic use rate, direct/indirect medical cost.
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FN rate
Timeframe: assessment at 1 month after the last cycle chemotherapy complete