Real-world Study on the Prevention of Neutropenia After Tumor Treatment With Mecapegfilgrastim Injection

Inclusion Criteria: * 1\. Patients with malignant tumors confirmed by histopathology or cytology; 2. Age ≥18 years old; 3. After referring to various guidelines, the researchers believed that the subjects: 1. Patients who are currently receiving treatment regimens with high FN risk; 2. Patients who are currently receiving treatment regimens for moderate FN risk and meet any one of the factors that increase the risk coefficient; 3. FN or dose-limiting neutropenia events have occurred in previous treatment cycles; 4. In addition to the above, the researchers believe that the medication regimens will cause neutropenia and affect the normal treatment of the subjects; 4. Researchers believe that they can benefit; 5. Voluntarily participate in this clinical trial and be able to sign the informed consent form in person. Exclusion Criteria: * 1\. Those who are allergic to the test drug； 2. Those with mental or neurological disorders who are unable to cooperate； 3. Pregnant or lactating female patients; Women of childbearing age who refuse to take contraceptive measures； 4. Those who were considered unsuitable for inclusion by the researchers.