The breast cancer patients planning for neo-adjuvant/adjuvant chemotherapy evaluated with medium-high risk of febrile neutropenia (FN) according to NCCN and ASCO guideline are recruited, receiving the first level prophylactic use of PEG-rhG-CSF or the second level prophylactic use of PEG-rhG-CSF according to real-world clinical judgement and choice by physicians in local cancer center for at least two cycles of chemotherapy. The primary outcome is FN rate, the second outcomes are rate of 3-4 grade decrease of ANC, FN-caused hospitalization, FN-caused antibiotic use rate, rate of reduction of chemotherapy dose, delay of chemotherapy, safety and pharmacoeconomics.
