Resolution of disseminated fusariosis in a child with acute leukemia treated with combined antifungal therapy: a case report
© Vagace et al; licensee BioMed Central Ltd. 2007
Received: 19 August 2006
Accepted: 10 May 2007
Published: 10 May 2007
Fusarium spp. is being isolated with increasing frequency as a pathogen in oncohematologic patients. Caspofungin and amphotericin B have been reported to have synergistic activity against Fusarium spp.
We herein report a case of disseminated fusariosis diagnosed by chest CT scan and positive blood cultures to Fusarium spp. Because the patient's clinical condition deteriorated, CRP levels increased, and blood cultures continued to yield Fusarium spp. despite liposomal amphotericin B monotherapy up to 5 mg/kg daily, treatment with caspofungin was added. Within 2 weeks of onset of combined antifungal therapy, the chest CT scan demonstrated a progressive resolution of the pulmonary lesions. Upon discontinuation of intravenous antifungals, the patient received suppressive therapy with oral voriconazole. Three months later, a chest CT scan showed no abnormalities. Twenty-five months after discontinuation of all antifungal therapy, the patient remains in complete remission of her neoplastic disease with no signs of clinical activity of the Fusarium infection.
This is the first description of successful treatment of disseminated fusariosis in a pediatric patient with acute lymphoblastic leukemia with caspofungin and amphotericin B followed by oral suppressive therapy with voriconazole.
Fusarium spp. is a saprophytic mould that is ubiquitous in the soil. Invasive fusariosis may follow the inhalation of airborne conidia or the inoculation of conidia through a skin breach associated with indwelling catheters, wounds, burns, or onychomycosis. Deep-seated and disseminated infections caused by Fusarium spp. are being diagnosed with increasing frequency in patients with hematological malignancies . The Fusarium species most frequently involved in human infections are Fusarium solani, F. oxysporum, F. verticilloides, and F. moniliforme . Of note, Fusarium species are often confused with Aspergillus spp. as both pathogens have similar histopathologic appearance with septate, dichotomously branching hyphae. Yet, the prognosis of invasive fusariosis is much poorer than for invasive aspergillosis, with very low response rates and most patients with disseminated Fusarium infection dying . We describe here the first case of a favorable response of disseminated fusariosis to combination caspofungin and liposomal amphotericin B followed by oral suppressive therapy with voriconazole in a pediatric patient with acute lymphoblastic leukaemia (ALL).
A 11-year-old, 50-kg female with a diagnosis of CD10+ ALL was admitted to the hospital with fever and intermittent chest pain. The patient was in complete remission (CR) following SHOP-99 chemotherapy. At the time of hospital admission, she was receiving G-CSF for severe granulocytopenia post-intensification with cytarabine, and had also received broad-spectrum antibiotics and fluconazole prophylaxis during previous episodes of febrile neutropenia.
Fusarium resistance to most antifungals and the severe immunosuppression-notably long-lasting, severe neutropenia – in oncohematological patients make Fusarium infections commonly fatal . Despite its low activity against Fusarium , amphotericin B remains the drug of choice. Voriconazole is licensed for the treatment of fusariosis based on in vitro data and a series of case reports with a reported response rate of ~40% . Posaconazole also has potential for therapy of systemic fusariosis . In any case, responses obtained with monotherapies remain too low and unsatisfactory.
We decided to treat our patient with amphotericin B and caspofungin for two reasons: (i) In our view amphotericin B remains the mainstay of therapy for fusariosis in pediatric patients; experience with voriconazole in this patient segment is limited [5–7]; (ii) Concurrent antifungal therapy is now generally considered an alternative way of improving outcome in difficult-to-treat invasive mycoses. In a recent in vitro study amphotericin B and voriconazole rendered mainly additive or subadditive interactions against Fusarium spp. . Yet, the concern remains that combining amphotericin B and azoles may lead to antagonism. In addition to the azole inhibition of the synthesis of amphotericin B's pharmacological target ergosterol, amphotericin B-related damage to the fungal cell membrane may interfere with the influx of azoles . In vitro caspofungin-inactive against Fusarium-showed synergistic or synergistic-to-additive interactions with amphotericin B for at least half of the Fusarium isolates . By inhibiting cell wall synthesis, caspofungin may presumably enhance the penetration of amphotericin B .
We hypothesize that combination antifungal therapy likely contributed to the sucessful treatment of our patient's severe invasive fusariosis, since clinical improvement only became evident after initiating caspofungin. Yet, the effect of caspofungin in the successful outcome of our case is not completely clear. The clinical response observed could also be the result of prolonged administration of liposomal amphotericin B and the lack of severe neutropenia. Finally, the administration of suppressive voriconazole and the early re-initiation of chemotherapy allowed by rapid infection control probably also contributed to the good long-term outcome. Of note, there have been a few case reports of response to caspofungin in combination with amphotericin B [11, 12] and as monotherapy , although in some of these reports there was a clear association of response to recovery from neutropenia.
We herein report an episode of disseminated fusariosis in a pediatric ALL patient treated successfully with caspofungin and amphotericin B followed by suppressive therapy with voriconazole. While our anecdotal observation is encouraging, the use of combination antifungal therapy is debatable and further in vivo studies are warranted to establish its true role in deep-seated and disseminated Fusarium infections.
- CD10+ :
Cluster differentiation 10-positive
- CT :
- SHOP-99 :
The standard protocol of the Spanish Society of Pediatric Hematology and Oncology for high risk acute lymphoblastic leukemia, which includes induction (prednisone, daunomycin, vincristine, cyclophosphamide, metothrexate, L-asparaginase), consolidation (metothrexate, cytarabine, mercaptopurine), and intensification (adriamycin, vincristine, dexamethasone, cyclophosphamide, metothrexate, cytarabine, L-asparaginase) chemotherapy.
- G-CSF :
Granulocyte-colony stimulating factor.
- CRP :
C reactive protein.
Written consent was obtained from the patient's parents for publication of study. There was no financial support for the preparation of this manuscript.
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