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Invasive candidiasis during granulocytopenia
1University of Texas M.D. Anderson Cancer Center, Houston 77030.
Abstract:
Candidiasis remains the most frequently encountered fungal infection in patients with profound granulocytopenia and appears to be increasing in frequency. In addition, Candida infections are occurring earlier during remission induction chemotherapy and can be caused by a variety of species such as C. albicans, C. tropicalis, and C. krusei. The most frequent source of disseminated infection is the gastrointestinal tract, as the integrity of the epithelium is disrupted by chemotherapeutic agents. The spectrum of disseminated candidiasis comprises both an acute and a chronic presentation (also known in the literature as hepatosplenic candidiasis). The management of disseminated infection consists of early empiric antifungal therapy with a standard agent, amphotericin B. Unfortunately, responses in the setting of profound granulocytopenia appear to be poor. Other agents that appear to be useful in the management of disseminated candidiasis include 5-flucytosine and fluconazole. Based on animal experimentation, it appears that the combination of these three classes of agents might produce superior results compared with amphotericin B alone. Removal of the central venous catheter does not appear warranted in the setting of profound granulocytopenia, and the role of colony stimulating factors needs to be defined. Given the severity and high mortality associated with disseminated candidiasis in patients with hematologic malignancies, antifungal prophylaxis appears warranted.
Insights
Disseminated candidiasis is a growing fungal infection risk for patients with low white blood cell counts. Combination antifungal therapy may improve outcomes compared to standard treatment alone.
Area of Science:
- Mycology
- Hematology
- Infectious Diseases
Background:
- Candidiasis is the most common fungal infection in patients with profound granulocytopenia.
- Infections are increasing in frequency and occurring earlier during chemotherapy.
- The gastrointestinal tract is the primary source of disseminated candidiasis due to chemotherapy-induced epithelial disruption.
Purpose of the Study:
- To review the current understanding of disseminated candidiasis in patients with profound granulocytopenia.
- To discuss the spectrum of disease, common causative species, and management strategies.
- To evaluate the potential benefits of combination antifungal therapy.
Main Methods:
- Literature review of candidiasis in patients with profound granulocytopenia.
- Analysis of current treatment guidelines and emerging therapeutic options.
- Consideration of animal experimentation for combination therapy efficacy.
Main Results:
- Amphotericin B is the standard empiric therapy, but responses are often poor in this patient group.
- 5-flucytosine and fluconazole show potential utility.
- Animal studies suggest combination therapy (amphotericin B, 5-flucytosine, fluconazole) may yield superior results.
Conclusions:
- Antifungal prophylaxis is recommended due to the high mortality of disseminated candidiasis in hematologic malignancies.
- Further research is needed to define the role of colony-stimulating factors.
- Central venous catheter removal is not indicated in profound granulocytopenia.