Is current initial empirical antibiotherapy appropriate to treat bloodstream infections in short-duration chemo-induced febrile neutropenia?

Cost-Effectiveness of Oral Levofloxacin Versus Amoxicillin-Clavulanate/Ciprofloxacin for Outpatient Management of Low-Risk Febrile Neutropenia in Children With Cancer in Egypt

PURPOSE

Febrile neutropenia (FN) is a common cancer complication in children. A growing body of evidence suggests that home-based care with oral antibiotics is safe and effective in carefully selected children with low-risk (LR) FN. This study aimed to assess the efficacy and safety of oral levofloxacin versus oral amoxicillin-clavulanate/ciprofloxacin in the management of LR-FN in children with cancer over a time horizon of 7 days from the National Cancer Institute (NCI) perspective.

PATIENTS AND METHODS

This is a randomized controlled study conducted at the NCI from December 2021 to September 2022, including children and adolescents age between 3 and 18 years who presented to the emergency room with LR-FN criteria with the exclusion of patients younger than 3 years and patients with Down syndrome. One hundred LR-FN episodes were enrolled in each arm. Patient demographics, microbiologic data, and outcomes were collected at different time points. A decision analytic model was created to compare the two treatment strategies. The outcome measures included quality-adjusted FN episodes, costs, and incremental cost-effectiveness ratios.

RESULTS

Levofloxacin was a safe and effective treatment option for LR-FN. It proved to be the dominant strategy against amoxicillin-clavulanate/ciprofloxacin with an incremental quality-adjusted life-year (QALY) of 0.0001 and a lower cost of 62.4996 Egyptian pounds (EGPs) in the treatment of home-based LR-FN with a willingness to pay a threshold of 77,520 EGPs per QALY (1 gross domestic product/capita).

CONCLUSION

For the treatment of FN in pediatric patients with cancer, levofloxacin offers a cost-saving option with improved survival benefits over a 7-day time horizon from the NCI perspective. These findings will help health care decisions regarding the allocation of health care system resources to improve supportive care for patients with LR-FN.

What if amoxicillin/clavulanic acid reduces the cisplatin anticancer impact on oral cancer treatment?

Antibiotics-chemotherapeutics combination have become on the table for many cancer treatments. For this reason, we thought that further progress and development of studies to support chemotherapeutic approaches with the use of antibiotics may be beneficial in the clinical field. Cell lines (SCC-15, HTB-41, and MRC-5) were treated with 5-100 μM/ml concentrations of cisplatin (cisp) and amoxicillin/clavulanic acid (amx/cla) with combination (amx/cla-cisp) and alone in three different incubation periods. The all-cells viability was examined with WST-1 and apoptotic activity of the drugs were investigated via cell death ELISA assay kit. The cytotoxic impact of the 100 μM amx/cla-cisp combination was found to be reduced by up to 21.8%, which was significant given that the cytotoxic effect of only cisplatin therapy was 86.1%. Because our findings demonstrated that solo amx/cla therapy have almost no impact on proliferation or death, we focused on the amx/cla-cisp combination effect. It was found that the amx/cla-cisp combination has reduced the apoptotic fragment when comparing with the solely cisp-treated cells. Due to amx/cla-cisp combination on both cells but significantly on SCC-15 recovered the sole cisplatin effect, we believe that there might be a second thought when prescribing antibiotics while treating cancer patients. Not only the antibiotic's type but also the cancer type might interact to lessen the chemotherapeutic agent's impact which is clinically a dilemma to focus on.

Clinical outcomes of antimicrobial resistance in cancer patients: a systematic review of multivariable models

BACKGROUND

Infections are major causes of disease in cancer patients and pose a major obstacle to the success of cancer care. The global rise of antimicrobial resistance threatens to make these obstacles even greater and hinder continuing progress in cancer care. To prevent and handle such infections, better models of clinical outcomes building on current knowledge are needed. This internally funded systematic review (PROSPERO registration: CRD42021282769) aimed to review multivariable models of resistant infections/colonisations and corresponding mortality, what risk factors have been investigated, and with what methodological approaches.

METHODS

We employed two broad searches of antimicrobial resistance in cancer patients, using terms associated with antimicrobial resistance, in MEDLINE and Embase through Ovid, in addition to Cinahl through EBSCOhost and Web of Science Core Collection. Primary, observational studies in English from January 2015 to November 2021 on human cancer patients that explicitly modelled infection/colonisation or mortality associated with antimicrobial resistance in a multivariable model were included. We extracted data on the study populations and their malignancies, risk factors, microbial aetiology, and methods for variable selection, and assessed the risk of bias using the NHLBI Study Quality Assessment Tools.

RESULTS

Two searches yielded a total of 27,151 unique records, of which 144 studies were included after screening and reading. Of the outcomes studied, mortality was the most common (68/144, 47%). Forty-five per cent (65/144) of the studies focused on haemato-oncological patients, and 27% (39/144) studied several bacteria or fungi. Studies included a median of 200 patients and 46 events. One-hundred-and-three (72%) studies used a p-value-based variable selection. Studies included a median of seven variables in the final (and largest) model, which yielded a median of 7 events per variable. An in-depth example of vancomycin-resistant enterococci was reported.

CONCLUSIONS

We found the current research to be heterogeneous in the approaches to studying this topic. Methodological choices resulting in very diverse models made it difficult or even impossible to draw statistical inferences and summarise what risk factors were of clinical relevance. The development and adherence to more standardised protocols that build on existing literature are urgent.

Model for Evaluating Antimicrobial Therapy To Prevent Life-Threatening Bacterial Infections following Exposure to a Medically Significant Radiation Dose

More evidence is needed to support recommendations for medical management of acute radiation syndrome (ARS) and associated infections resulting from a radiological/nuclear event. While current guidelines recommend the administration of antibiotics to chemotherapy patients with febrile neutropenia, the clinical benefit is unclear for acute radiation injury patients. A well-characterized nonhuman primate (NHP) model of hematopoietic ARS was developed that incorporates supportive care postirradiation. This model evaluated the efficacy of myeloid growth factors within 24 to 48 h after total body irradiation (TBI). However, in this model, NHPs continued to develop life-threatening bacterial infections, even when granulocyte colony-stimulating factor or granulocyte-macrophage colony-stimulating factor was administered in combination with antibiotic monotherapy. In this study, we evaluated the efficacy of combination antibiotic therapies administered to NHPs following 7.4-Gy TBI to understand the occurrence of bacterial infection in NHPs with hematopoietic ARS. We compared enrofloxacin-linezolid, enrofloxacin-cefepime, and enrofloxacin-ertapenem to enrofloxacin monotherapy. The primary endpoint was 60-day postirradiation mortality, with secondary endpoints of overall survival time, incidence of bacterial infection, and bacteriologic culture with antimicrobial susceptibility testing. We observed that enrofloxacin-ertapenem significantly increased survival compared to enrofloxacin monotherapy. Bacteria isolated from nonsurviving macaques with systemic bacterial infections exhibited uniform resistance to enrofloxacin and variable resistance to beta-lactam antibiotics, linezolid, gentamicin, and azithromycin. Multidrug antibiotic resistance was observed in Enterococcus spp. and Escherichia coli. We conclude that antibiotic combination therapies appear to be more effective than monotherapy alone but acknowledge that more work is needed to identify an optimal antimicrobial therapy.

Improving management of fever in neutropenic children with cancer across multiple sites

OBJECTIVE

To evaluate the effectiveness of a clinical pathway in achieving antibiotic administration in less than 60 minutes for children with cancer, presenting with fever and neutropenia. Secondary objectives were to determine association between time to antibiotics (TTA) and other variables including fever duration, location of care and intravenous access types.

METHODS

Following introduction of the clinical pathway, we collected prospective data about management of all cases that did and did not use the pathway across multiple sites over 16 months. A follow-up audit was conducted after 12 months.

RESULTS

We evaluated a total of 453 presentations. Use of the clinical pathway was significantly associated with achieving TTA in less than 60 minutes (RR 0.69, 95% CI 0.56-0.85, p = <0.001). Despite varying use of the pathway over time, the median time to antibiotics was achieved in both the initial study period (57 minutes) and sustained at follow-up (60 minutes). TTA was also associated with types of intravenous access device and location of care and with length of stay. We did not find any association between TTA and any other variables.

CONCLUSION

Clinical pathways improve fever management in this patient cohort. Ongoing education and auditing to identify factors which impact processes of care are necessary.