The Relevance of Febrile Neutropenia in Oncology

Treatment Guidelines and Management
Initial Assessment
The ASCO, IDSA, and NCCN guidelines all recommend taking a minimum of 2 sets of blood cultures from 1 peripheral and 1 central site. These guidelines also indicate that clinicians should review patient characteristics such as complete blood counts, liver enzymes, prior antimicrobial therapy, and potential sites of infection.5

Risk Stratification
It is essential to perform proper risk stratification because the patient’s level of risk determines the type of empirical therapy they will receive.4,6,7 Risk stratification is conducted by using a risk index called the Multinational Association of Supportive Care in Cancer (MASCC) score, a validated scale in all 3 guidelines.5 The MASCC score has several criteria such as » age, symptom severity, and comorbidities, all of which are given a weighted numerical value. Patients who score ≥21 or <21 are classified as low risk and high risk, respectively.3 Risk stratification helps determine the route (oral vs intravenous [IV]) and duration of empirical therapy, and location of treatment (inpatient vs outpatient).6

Initiation of Therapy
The 3 guidelines in FN management have slightly different recommendations regarding the timing of initial empirical therapy. The ASCO guidelines recommend starting empirical therapy within 1 hour of admission, while the IDSA guidelines recommend starting within 2 hours of admission. The NCCN guidelines do not provide a time frame for empirical therapy initiation.5

Low-Risk Patients
If clinically indicated, patients who are classified as low risk through their MASCC score may receive IV antibiotic therapy with agents such as meropenem, piperacillin/tazobactam, or extended-spectrum antipseudomonal cephalosporins. Outpatient treatment may be considered for low-risk patients with favorable factors such as hemodynamic stability, lack of comorbid conditions, good performance status, no renal or hepatic insufficiency, and absence of organ dysfunction. For these low-risk outpatient individuals, empirical treatment of oral fluoroquinolones (ciprofloxacin or levofloxacin) with the addition of amoxicillin/clavulanate or clindamycin is generally recommended.4,6,7 If the patient had received prior fluoroquinolone-based prophylaxis or if local antibiograms indicate fluoroquinolone resistance to be ≥20%, then fluoroquinolone monotherapy is not recommended.5

Follow-up procedures for outpatient management include frequent evaluation for at least 3 days, daily telephone evaluations, and frequent monitoring of absolute neutrophil count and platelets for myeloid count recovery (see Table 14,6,7 for additional information).4,7

High-Risk Patients
Patients who have MASCC scores below 21 or unfavorable prognostic factors are classified as high risk. These high-risk patients are recommended to be hospitalized and treated as inpatients with IV empirical therapy. The guidelines recommend monotherapy with piperacillin-tazobactam, a carbapenem (imipenem/cilastatin or meropenem), or an empirical IV antipseudomonal beta-lactam agent, such as cefepime.4,6 Depending on blood cultures and local antibiotic resistance patterns, the administration of additional agents such as vancomycin for suspected methicillin-resistant Staphylococcus aureus infection may be warranted.6 However, unless otherwise indicated by blood cultures or microbiology tests, combination therapy is not recommended because of the risk of breakthrough infections and increasing resistance.4

Persistent Neutropenic Fever Syndrome
Persistent neutropenic fever (PNF) syndrome occurs when patients remain continuously febrile and neutropenic after initiation of empirical broad-spectrum therapy. Patients with PNF should be closely monitored for proper follow-up treatment.7 Treatment guidelines recommend hospitalizing patients and initiating empirical antifungal therapy for patients who show no response to broad-spectrum antibiotics after 4 to 7 days, and who are expected to remain neutropenic for more than 7 days. Empirical antifungal agents should provide better coverage against fluconazole-resistant Candida infections and molds such as Aspergillosis, the most common invasive mold infection. Additional agents may be added if indicated through blood culture lab tests.6 Amphotericin B products are commonly used as empirical therapy when the etiology of PNF is unknown (see Table 24,6,7 for additional information).4

Antibacterial and Antifungal Prophylaxis Guidelines
Antibacterial and antifungal prophylaxis may be considered as a preventative measure in patients at high risk for FN. The ASCO, NCCN, and IDSA guidelines share similar recommendations and suggest using antibacterial and antifungal prophylaxis in patients whose neutrophil counts are expected to be below 100 cells/µL for more than 7 days. Additionally, the guidelines do not support the use of antibiotic prophylaxis in low-risk patients who are expected to remain neutropenic for fewer than 7 days. Generally, if there are no documented resistance patterns, then a fluoroquinolone agent is recommended for antibacterial prophylaxis. The ASCO guidelines recommend using an oral triazole as an agent of choice for antifungal prophylaxis.4,6,7

Role of G-CSFs in Treatment of FN
Granulocyte colony stimulating factors (G-CSFs) are used to increase production of granulocytes and neutrophils for myeloid count recovery, and they have been shown to reduce the risk and duration of FN.8,9 Currently, G-CSFs are indicated for decreasing the incidence of FN  in patients with nonmyeloid cancers who are undergoing myelosuppressive chemotherapy.9 Current guidelines recommend the use of G-CSFs as primary prophylaxis (defined as the use of G-CSFs during the first cycle of myelosuppressive chemotherapy to prevent the occurrence of neutropenic fever) when the risk of FN exceeds ≥20% and it is clinically indicated by patient-, treatment-, and medication-specific factors.6,8,10,11

G-CSFs are not recommended when the risk of developing FN is less than 10%, the patient is afebrile, or as adjunctive treatment with antibiotic therapy in patients with established FN.6,8,10 However, guideline recommendations note that patients at high risk for infection-related complications or patients who have poor prognostic factors, such as sepsis and elderly age, may benefit from G-CSFs to improve clinical outcomes.8,10

When the risk of FN is intermediate (between 10% and 20%), the NCCN guidelines recommend assessing patient-specific risk factors and prior chemotherapy regimens. G-CSF use may be considered if a patient demonstrates at least 1 risk factor, such as impaired liver or kidney function.8

In certain circumstances, G-CSFs may be used as secondary prophylaxis for FN recurrence. Patients who have experienced episodes of FN in prior chemotherapy cycles have a 50% to 60% chance of FN reoccurrence in subsequent cycles. To reduce this risk, dose reduction or treatment delay of future cycles may be recommended.11 However, if dose reduction or treatment delay would compromise the patient’s overall survival or treatment outcomes, then it is recommended to use G-CSFs as secondary prophylaxis to reduce the risk of FN recurrence.10 Interestingly, while the European Society for Medical Oncology (ESMO) guidelines describe similar recommendations to North American guidelines for G-CSF primary and secondary prophylaxis in FN,12 one notable difference is that the ESMO guidelines do not mention recommendations in patients who have less than a 20% risk of FN. However, similar to the North American guidelines, the ESMO guidelines suggest considering G-CSF if chemotherapeutic dose reduction or treatment delay would negatively impact patient outcomes.12

Although FN is a medical emergency that can cause serious adverse complications and must be treated promptly, guidelines and recommendations may help facilitate appropriate decision making. The ASCO, NCCN, and IDSA guidelines all stress the importance of proper risk stratification and patient assessment to determine the correct course of broad-spectrum empirical therapy. Clinicians must also be aware of the benefits and limitations of G-CSFs in oncologic therapy and their role in the prophylaxis and treatment of FN. By adhering to evidence-based clinical guidelines, healthcare providers have the potential to provide optimized treatment regimens and lower the risk of FN for their patients.
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