Pharmacology and metabolism of anidulafungin, caspofungin and micafungin in the treatment of invasive candidosis - review of the literature
© I. Holzapfel Publishers 2011
Received: 11 February 2011
Accepted: 15 February 2011
Published: 28 April 2011
Echinocandins represent the newest class of antifungal agents. Currently, three echinocandins, anidulafungin, caspofungin and micafungin are licensed for clinical use in various indications. They act as inhibitors of β-(1,3)-glucan synthesis in the fungal cell wall and have a favorable pharmacological profile. They have a broad spectrum of activity against all Candida species. Higher MIC's have been observed against C. parapsilosis and C. guilliermondii. Data from clinical trials for invasive Candida infections/candidaemia suggest that the clinical outcome of patients treated with either drug may be very similar. A comparison has been done between caspofungin and micafungin but for anidulafungin a comparative trial with another echinocandin is still lacking. All three drugs are highly effective if not superior to treatment with either fluconazole or Amphotericin B, particularly in well-defined clinical settings such as invasive Candida infections, Candida oesophagitis and candidaemia. Differences between the three echinocandins with regard to the route of metabolism, requirement for a loading dose, dose adjustment in patients with moderate to severe hepatic disease and different dosing schedules for different types of Candida infections have to be considered. Relevant drug-drug interactions of Caspofungin and Micafungin are minimal. Anidulafungin has no significant drug interactions at all. However, echinocandins are available only for intravenous use. All three agents have an excellent safety profile.
Keywordsechinocandins anidulafungin caspofungin micafungin pharmacology antifungal agents
Despite the rapid development of the triazoles in the 1990s and the availability of liposomal amphotericin which replaced conventional amphotericin B and provided alternative options for treating invasive fungal infections, complications due to fungal infections remain a serious clinical problem, especially in immunocompromised patients. This population includes transplant recipients (solid organ and stem cells), patients with cancer, patients treated in internal and surgical ICU's or other treated for diseases with immunosuppressive agents and patients with HIV/AIDS. Many factors have contributed to the rise of several fungal infections in the last decades, including novel and more aggressive immunosuppressive drugs and regimens, a high frequency of instrumentation and catheterization, frequent application of in travenous catheters, long-term parenteral nutrition and prolonged use of broad-spectrum antibiotics. Enhanced survival in intensive care units due to advances in medicine also increases the patient population susceptible to secondary fungal infections [1, 2].
Candida infections have contributed significantly to the mortality in immunosuppressed patients and treatment outcomes for invasive candidosis are still less than optimal. Candidaemia has been observed to be the fourth leading cause of bloodstream infections in pediatric patients, cancer patients, and hospitalized patients with mortality rates from 20% in pediatric patients to 47% in intensive care unit patients [3–5]. Candida albicans is still the most commonly found isolate. However, there has been a shift towards more azole resistant species (e.g. Candida glabrata) found in some institutions, paralleled by a reduced susceptibility to azole antifungals such as fluconazole which is commonly used for superficial and invasive Candida infections [6, 7]. The expert Panel of the IDSA favours an echinocandin for first-line treatment of candidaemia in non-granulocytopenic patients with moderately severe to severe illness, as first-line treatment for granulocytopenic patients, patients recently exposed to azole, candidaemia caused by C. glabrata, and/or suspected invasive candidosis caused by C. glabrata or C. krusei .
Echinocandins are cyclic lipopeptide molecules that inhibit the synthetic cell-wall enzyme complex β-1,3-D-glucan synthase. Inability of the organism to build β-1,3-D-glucan destabilizes the integrity of the fungal cell wall, leading to osmotic instability and cell death [9, 10]. Echinocandins are fungicidal against yeast and fungistatic against molds and have a similar spectrum of antifungal activity. In addition, echinocandin activity can persist in a drug free environment following drug exposure (post-antifungal effect) .
There are three echinocandins approved by the European Medicines Agency (EMEA) for the use in Europe, 1) Caspofunggin (MK-0991, Cancidas®; Merck & Co., Inc., Whitehouse Station, NJ, USA) derived from Glarea lozoyensi, was approved first in 2001; 2) Anidulafungin (VER-002, LY303366, Eraxis®, Pfizer, Inc., New York, NY, USA) derived from Aspergillus nidulans and approved in 2007; and 3) Micafungin (FK-463, Mycamine®, Astellas Pharma US, Inc., Deerfield, IL, USA) derived from Coleophoma empedri was approved in 2008 [12–14]. Licensed indications in Europe differ between the three agents. Anidulafungin is indicated to treat invasive candidosis in adults who are not granulocytopenic but not in children or adolescents below the age of 18 years. Caspofungin is indicated to treat adults, adolescents and children with invasive candidosis, invasive aspergillosis when the patient does not respond to or does not tolerate amphotericin B or itraconazole; suspected fungal infections (such as due to Candida or Aspergillus) when the patient is febrile and granulocytopenic. Micafungin is indicated for adults, adolescents and children (including neonates) in the treatment of invasive candidosis, and prophylaxis of candida infection in patients undergoing allogeneic haematopoietic stem cell trans plantation or patients who are expected to have granulocytopenia (absolute neutrophil count < 500 cells/μl) for 10 or more days. In addition, micafungin is licensed for treatment of oesophageal candidosis in adults for whom intravenous therapy is appropriate [12–14].
As the incidence of fungal infections caused by fluconazole-resistant non-Candida-albicans species is increasing, echinocandins have become an important group in the treatment of these types of infections because of lack of cross-resistance to azoles . Their limited toxicity and a favorable drug-drug interactions profile make them a viable alternative to conventional treatment.
Anidulafungin and Micafungin are freely soluble in water. Caspofungin is freely soluble in water and methanol, and slightly soluble in ethanol. Because of their inconsistent oral absorption, echinocandins are available only for intravenous use. Micafungin is prepared as a powder ready for reconstitution and excipients include lactose, citric acid, and sodium hydroxide. Reconstituted solution is stable at room temperatures for 48 h (if protected from light). Caspofungin is provided as a lyophylised powder and excipients include sucrose, mannitol, acetic acid, and sodium hydroxide. It can be stored (refrigerated) for up to 24 h after reconstitution. Anidulafungin is also provided as a lyophylised powder for reconstitution. The vial must be reconstituted with water for injections and subsequently diluted with (0.9%) sodium chloride for infusion or (5%) glucose for infusion. Chemical and physical in-use stability of the infusion solution has been demonstrated for 24 hours at 5°C [12–14, 16].
Mechanism of action
The target of echinocandins, β-1,3-D-glucan synthase is an integral part of the fungal cell wall and consists of two subunits, Fksp and Rho1p. Fksp is the active side of the enzyme and is encoded by three genes (FKS1, FKS2 and FKS3). FKS1 transcription is cell-cycle regulated, and linked to cell-wall remodeling. FKS2 transcription is calcineurin-dependent . Calcineurin-inhibitors such as tacrolimus seem to enhance the echinocandin activity in vitro, similar as it is supposed for synergistic activity of fluconazole with cyclosporine A [17, 18]. Rho1p is thought to be a key switch, driving or arresting the synthesis of β-1,3-glucan. β-1,3-D-glucan provides along with chitin the integrity and shape of the cell wall. Blocking of its synthesis results in osmotic lysis of the cell, thus leading to fungicidal activity of the echinocandins against Candida species . The cell-wall is not a part of mammalian cells, and therefore an excellent target for antifungal agents.
Spectrum of activity
Echinocandins are know to be active against Candida and Aspergillus species but are also active against Pneumocystis jirovecii. They are not active at clinically relevant concentrations against Zygomycetes, Cryptococcus neoformans, or Fusarium species . Considering the family of yeast which is the main subject of this review, echinocandins display in vitro and in vivo fungicidal activity against most Candida species, including Candida albicans, Candida glabrata, Candida tropicalis, Candida dubliniensis, and Candida krusei. They are less active against Candida parapsilosis and Candida guilliermondii, with higher minimum inhibitory concentrations for these species . The MIC50 of caspofungin and anidulafungin against C. albicans ranges from < 0.01 μg/mL to > 8 μg/mL, and that of micafungin from < 0.01 μg/mL to 0.5 μg/mL. The MIC90 against C. albicans ranges from 0.01 μg/mL to 0.5 μg/mL for anidulafungin; 0.01 μg/mL to 0.25 μg/mL for micafungin, and from 0.12 μg/mL to 1 μg/mL for caspofungin, respectively [19–22]. Accordingly, the CLSI subcommittee has decided to recommend a "susceptible only" breakpoint MIC of < or = 2 μg/ml due to the lack of echinocandin resistance in the population of Candida isolates .
The activity is comparable between the three agents and all of them present much lower MICs than amphotericin B and fluconazole against common Candida spp. . The exception are Candida parapsilosis and Candida guilliermondii for which minimal inhibitory concentrations are typically higher and range from 0.5 μg/mL to 4.0 μg/mL. Breakthrough bloodstream infections (BSI) with Candida parapsilosis and Candida guilliermondii as well as progressive Candida oesophagitis with Candida albicans have been observed in patients receiving caspofungin [23–28]. Some data indicate that anidulafungin could have lower MICs against C. parapsilosis and C. glabrata strains that demonstrate enhanced MICs to caspofungin and micafungin . Whether this is clinically meaningful needs to be established.
The incidence of resistance to echinocandins is rare, but some case reports have illustrated the potential for resistance development [24, 27, 29]. Mutations of the FKS gene have been indentified to cover echinocandins resistance in most cases. Specifically FKS1 mutations were found to be associated with a profound decrease in susceptibility to echinocandins [16, 24, 30, 31]. It is supposed that these mutations result in cross-resistance to all agents in the class. The second distinct mechanism potentially conferring resistance to echinocandins is the presence of a drug efflux pumps in the fungal cell wall. The cdr2p gene (also known to contribute to fluconazole resistance in C. albicans) was associated with an increase in MICs of caspofungin. The same phenomenon, but to a lesser extent, was seen for cdr1p .
All three echinocandins exhibit concentration-dependent killing against most Candida spp. over a broad concentration range. The killing efficacy is correlated with plasma peak (Cmax)/MIC ratio or area under the concentration-time curve (AUC)/MIC ratio [11, 33, 34]. Interestingly, echinocandin activity can be still observed in a drug free environment following drug exposure. It is known as the post - antifungal effect and is also concentration dependent, with higher concentrations resulting in longer post-antifungal effects [35, 36]. According to that phenomenon, extended dosing intervals might be an option as shown in an animal model of mice treated with micafungin for disseminated candidosis [37–39]. In children, a pharmacokinetic study found that alternate-day dosing of micafungin given as antifungal prophylaxis plasma levels were found to remain above the MIC's of susceptible fungal pathogens . However, further studies are needed to support this procedure in clinical practice. Another interesting phenomenom is the "eagle effect". In vitro, a paradoxical increase in fungal growth ("paradoxical growth", "eagle effect") could be observed if echinocandin concentration was increased above the organism's MIC [41–43]. However, this effect varies remarkably between the three echinocandins . In four different Candida species alterations were observed in cell wall components and ultrastructure associated with paradoxical growth . In paradoxical growth cells, β-1,3-glucan content decreased from 2.7-to 7.8-fold, whereas chitin content increased from 4.0-to 6.6-fold. High concentrations of the echinocandin could depress resistance mechanisms but the clinical relevance of this phenomenon is unknown.
Activity against biofilms
Candidemia is often associated with intravascular catheters, which can be complicated by building of biofilms that consist of sessile cells. Contrary to fluconazole, all three echinocandins were shown to be active against biofilms. Caspofungin, micafungin and anidulafungin exhibit activity against sessile cells of C. albicans, C. dubliniensis, C. glabrata and C. krusei which can be of clinical relevance [45–49].
In general, because of their large molecular weight, echinocandins are poorly bioavailable for oral use, and therefore they are approved only for intravenous administration. However, one echinocandin (enfumafungin) potentially suitable for oral use is currently under investigation . All echinocandins distribute well into tissues, but none of them penetrate sufficiently the CNS or the eye, therefore they are not recommended as drug of choice for treatment of patients with fungal meningitis or endophthalmitis [8, 51]. Animal models suggest the potential usefulness of the echinocandins in Candida meningoencephalitis although higher doses might be required (as studied for micafungin) but this needs further clinical investigation [34, 52]. The echinocandins are not dialyzable, and there is no need for supplemental doses after haemodialysis. Dose adjustment is also not required in patients with renal impairment. Pharmacokinetic data in the public domain to support this statement are currently only available for anidulafungin .
Pharmacokinetics of echinocandins for the treatment of Candida infections
Mode of administration
Oral availability [%]
Plasma protein binding [%]
Volume of distribution [L]
Elimination half-life [h]
Route of elimination
U > F
F > U
Caspofungin is characterized by a moderate nonlinear pharmacokinetics with increased accumulation as the dose is increased, and a dose dependency in the time to reach steady state upon multiple-dose administration. In contrast to a short α-phase and a predominat β-phase that exhibits log linearity, a long γ-phase appears to be nonlinear and responsible for the accumulation of caspofungin over time. The dosage of caspofungin is a 70-mg loading dose followed by 50 mg once/day, resulting in a through concentration of at least 1 μ/mL. Higher dosages of caspofungin (up to 150 mg/d) have been studied in clinical trials suggesting a higher efficacy in subgroups of patients and a dose-related response [60, 61]. The metabolism is slow, it undergoes spontaneous disintegration to an open-ring compound followed by peptide hydrolysis and N-acytylation into two inactive metabolites in the liver [62, 63]. The half-life of caspofungin is 9-11 h (s. Table 1). An additional gamma-phase also occurs with a half-life of 45 hours. The elimination of caspofungin from plasma is slow with a clearance of 10-12 ml/minute. Approximately 75% of a radioactive dose was recovered during 27 days: 41% in urine and 34% in faeces. A small amount of caspofungin is excreted unchanged in urine (approximately 1.4% of dose) .
Micafungin is characterized by linear pharmacokinetics over the daily dose range of 12.5 mg to 200 mg and 3 mg/kg to 8 mg/kg. There is no evidence of systemic accumulation with repeated administration and steady-state is reached within 4 to 5 days. It is metabolized into three metabolites. The first metabolite is formed by arylsulfatase and further degraded by catechol-O-methyl-transferase to the second metabolite. The third metabolite is the result of the side chain hydrolysis by CYP3A, but this pathway does not play a significant role in the drug metabolism. The degradation products are excreted slowly over many days, mainly in the bile. Following intravenous administration concentrations of micafungin show a biexponential decline. The drug is rapidly distributed into tissues. In systemic circulation, micafungin is highly bound to plasma protein (> 99%), primarily to albumin. Binding to albumin is independent of micafungin concentration (10-100 μg/ml). The volume of distribution at steady state (Vss) was approximately 18-19 litres. The mean terminal half-life is approximately 10-17 hours and stays consistent across doses up to 8 mg/kg and after single and repeated administration. Total clearance was 0.15-0.3 ml/min/kg in healthy subjects and adult patients and is independent of dose after single and repeated administration. Following a single intravenous dose of 14C-micafungin (25 mg) to healthy volunteers, 11.6% of the radioactivity was recovered in the urine and 71.0% in the faeces over 28 days. No loading dose is required for micafungin . Recommended standard dosages vary according to the indication and body weight. For treatment of invasive candidosis in adults the daily dose is 100 mg/d (children 2 mg/kg/d if body weight is ≤40 kg), for treatment of oesophageal candidosis the daily dose is 150 mg/d (children 3 mg/kg/d if body weight is ≤40 kg), and for prophylaxis of Candida infections in stem cell recipients the daily dose is 50 mg/d (children 1 mg/kg/d if body weight is ≤40 kg) [64–66].
Anidulafungin displays linear pharmacokinetics across a wide range of once daily doses (15-130 mg). A low intersubject variability in systemic exposure was observed. The steady state was achieved on the first day after a loading dose. It undergoes slow spontaneous biotransformation into an inactive open-ring peptide, and is excreted in the bile . No liver metabolism has been observed. Anidulafungin is not a clinically relevant substrate, inducer, or inhibitor of cytochrome P450 isoenzymes. The pharmacokinetics of anidulafungin are characterised by a rapid distribution half-life (0.5-1 hour) and a volume of distribution, 30-50 l, which is similar to total body fluid volume. Anidulafungin is extensively bound (> 99%) to human plasma proteins. No specific tissue distribution studies of anidulafungin have been done in humans. Therefore, no information is available about the penetration of anidulafungin into the cerebrospinal fluid (CSF) and/or across the blood-brain barrier. The tissue concentrations can reach ten times that of plasma as indicated by animal studies . The clearance of anidulafungin is about 1 l/h. Anidulafungin has a predominant elimination half-life of 24 hours that characterises the majority of the plasma concentration-time profile, and a terminal half-life of 40-50 hours that characterises the terminal elimination phase of the profile. The steady state Cmax and trough concentrations (Cmin) after standard dosing (loading 200 mg followed by 100 mg) on day 1 is about 7 and 3 mg/l, respectively. Approximately 30% of the administered radioactive dose was eliminated in the faeces over 9 days, of which less than 10% was intact drug. Less than 1% of the administered radioactive dose was excreted in the urine, indicating negligible renal clearance. Weight was identified as a source of variability in clearance in the population pharmacokinetic analysis, but so far weight has little clinical relevance on the pharmacokinetics of anidulafungin, yet. A dose finding study has been performed ranging from 50 to 100 mg/d (received a loading dose of twice the daily maintenance dose given as a single infusion on day 1) for the indication candidaemia which found that higher dosages (75 mg and 100 mg/d) are more effective . A large double-blind trial in 601 patients with endoscopically and microbiologically documented esophageal candidosis comparing oral fluconazole (200 mg on day 1, followed by 100 mg per day) with intravenous anidulafungin (100 mg on day 1, followed by 50 mg per day) for 7 days beyond resolution of symptoms (range, 14-21 days) found anidulafungin equally effective . The currently licensed standard dosage of anidulafungin is a 200 mg loading dose followed by 100 mg once daily.
Patients with hepatic impairment
Dose adjustment is also not required in patients with mild and moderate hepatic impairment for all three agents. The AUC may be increased up to 75% for caspofungin and a dose reduction to 35 mg/d maintenance therapy is recommended. However, caspofungin and micafungin were not studied in adults with severe hepatic impairment as well as in children (all echinocandins) with any degree of hepatic impairment and should not be given in these situations [12–14]. Only anidulafungin has been studied in patients with severe hepatic impairment and may be given in this condition . Anidulafungin is not metabolized by the liver and no enhanced serum levels of liver enzymes have been found with any level of hepatic impairment. Patients who develop abnormal liver function tests during treatment with micafungin should be evaluated for the risk/benefit ratio. The development of foci of altered hepatocytes (FAH) and hepatocellular tumors after a treatment period of three months or longer were observed in rats with micafungin. Because development of hepatocellular tumors in humans cannot be excluded, a warning was added to the package insert. No dose adjustment is needed for caspofungin in patients with mild hepatic disease, but in case of moderate disease, the 70 mg loading dose should be followed by 35 mg once daily [12–14].
Micafungin is approved for use in neonates and children. AUC values were dose proportional over the dose range of 0.5-4 mg/kg. Clearance was influenced by age, with mean values of clearance in younger children (2-11 years) being approximately 1.3 -fold greater than those in older children (12-17 years). Older children had mean clearance values similar to those determined in adult patients. Mean clearance in premature infants is approximately 5-fold greater than in adults [56, 70].
Caspofungin is approved for use in children (12 months to 17 years). In children receiving 1 mg/kg/day caspofungin (maximum, 50 mg/day), the area under the concentration-time curve over 24 h (AUC0-24) was significantly smaller (46% after multiple doses) than that observed in adults receiving 50 mg/day. In children and adolescents receiving 50 mg/m2/day (maximum, 70 mg/day), the AUC0-24 following multiple doses was similar to that for the exposure in adults receiving 50 mg/day. Accordingly, Caspofungin administration at 50 mg/m2/day provides a comparable exposure in children (12 months to 17 years) to that of adult patients treated with 50 mg/day .
Anidulafungin is currently not approved for use in children. Pediatric patients with neutropenia (2 - 17 years of age) receiving 0.75 mg/kg/day or 1.5 mg/kg/day had anidulafungin concentration profiles similar to those of adult patients receiving 50 or 100 mg/day, respectively .
Geriatric population, pregnant Women and nursing mothers
No dose adjustment is required for geriatric population. All echinocandins have embryo toxic potential and all three of them have been found in the breast milk of rats. Therefore, they should only be used during pregnancy or in nursing women if benefits overweigh the risks [12–14].
Echinocandins are poor substrates for the cytochrome P450 enzymes (caspofungin is the most dependent echinocandin on the CYP450 system and anidulafungin shows the least interaction potential). They also do not influence the P-glycoprotein family. Therefore, there are very few known drug-drug interactions with these drugs. Rifampin, nevirapine, efavirenz, carbamazepine, phenytoin, and dexamethasone can induce the clearance of caspofungin. Increasing the dose of caspofungin to 70 mg daily should be considered if concomitant use of these drugs is necessary . Transient elevations of liver function tests have been observed in patients receiving caspofungin and cyclosporine (CsA; and/or tacrolimus) in a phase I trial . Although CsA is a potent inhibitor of CYP3A4 and P-glycoprotein, these pathways are not involved in the metabolism of caspofungin. However, in two cohorts of stem cell and organ (liver) transplant patients receiving concomitantly caspofungin with cyclosporine A or tacrolimus, no or mild liver enzyme elevation was observed [73, 74]. Caspofungin interacts with tacrolimus and reduces its AUC by 20%. Monitoring of drug concentrations of tacrolimus is required in patients who receive both drugs. Interestingly, both CsA and tacrolimus exhibit a clear in vitro positive interaction with caspofungin against Aspergillus fumigatus in vitro. Microscopic morphological analyses indicate that the calcineurin inhibitors delay filamentation, and in combination with caspofungin there is a positive interaction. These findings even suggest a potential role for combination therapy with calcineurin pathway inhibitors . Micafungin has a potential to increase concentrations of sirolimus, itraconazole and nifedipine. Dose reduction of these drugs may be required. Coadministration with tacrolimus, cyclosporine, fluconazole, prednisolone, ritonavir and rifampin do not alter the pharmacokinetic of any of the drugs .
No dosage adjustments are necessary for anidulafungin if coadministered with any other drug .
Safety and adverse drug reactions
Echinocandins are contraindicated in patients with known hypersensitivity to the agents or any of its components. As mentioned above, micafungin includes a warning of possible development of liver tumors. In general, the echinocandins are well tolerated and similar in types of adverse effects. They have a favorable safety profile compared to other antifungals. Infusion related reactions may occur after use of all three echinocandins (< 5%), but they respond well to antihistamines and the drug needs not to be withdrawn. Thrombophlebitis may occur as well (< 3%; primarily seen in HlV infected patients with peripheral lines) but infusion-related reactions were less frequently observed as compared to liposomal amphotericin when used as empiric antifungal therapy in patients with persistent fever and granulocytopenia . Caspofungin has a somewhat higher frequency of liver-related laboratory abnormalities (1-15%) compared to the other two drugs . Nausea, vomiting, diarrhea and other mild gastrointestinal symptoms are possible, but rare.
Pharmaco-economic analysis revealed that echinocandins (caspofungin, micafungin) may be more cost-effective than liposomal amphotericin B in the treatment of suspected fungal infections, especially for azole-resistant cases and in patients with renal impairment [77, 78]. In fluconazole-susceptible invasive Candida infections (C. albicans), anidulafungin was found to be superior than the azole antifungal in a randomized trial . Whether anidulafungin is cost-effective more than fluconazole needs to be further analyzed. In a model with inputs from the literature in a hypothetical 1000-patient cohort with suspected ICU-acquired invasive candidosis (ICU-AC) treated empirically with either micafungin or fluconazole or no treatment accompanied by a watchful waiting strategy, treatment of suspected ICU-AC (for fluconazole-resistant Candida spp.) with the echinocandin at a dose of 100 mg daily was a cost-effective alternative compared with 400 mg daily FLU or observation alone .
Most of these reports were supported by the corresponding manufacturer of the antifungal drug and confirmation of these findings in independent studies is awaited.
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