Poor response to azithromycin in cutaneous leishmaniasis leading to a premature interruption of a multicentric phase III clinical trial in Brazil

Abstract

Introduction  Parenteral antimony-based compounds are still the standard of care for cutaneous leishmaniasis (CL) treatment in many countries, despite their high toxicity. Previous studies showed that oral azithromycin could be an option for CL treatment. The aim of this study was to evaluate efficacy and safety of oral azithromycin (AZ) for CL treatment compared with injectable meglumine antimoniate (MA).

Methods  This was a randomized, open-label, 2-arm, non-inferiority clinical trial. Treatment-naïve patients with localized CL were treated with MA (15mg/kg/day up to 1,215mg) or AZ (500mg/day) during 20 consecutive days. The primary efficacy end point was a CL cure 90 days after treatment completion. The analysis was performed with intention-to-treat (ITT) and per protocol (PP) analyses. After an anticipated interim analysis, the study was interrupted due to the high failure rate in the azithromycin group.

Results  Twenty-four volunteers were included in each group. The MA group had a higher cure rate than the AZ group with the ITT and PP analyses, which were 54.2% versus 20.8% [relative risk (RR) 1.97; 95% confidence intervals (95%CI) 1.13-3.42] and 72.2% versus 23.8% (RR 3.03; 95%CI 1.34-6.87), respectively. No unexpected adverse events were observed.

Conclusions  Azithromycin is ineffective for CL treatment and does not seem to have a role in the therapeutic arsenal for CL.

Azithromycin; Cutaneous leishmaniasis; Leishmania braziliensis ; Randomized controlled trial; Meglumine antimoniate

INTRODUCTION

Cutaneous leishmaniasis (CL) is a serious public health problem, with approximately 0.69 to 1.2 million new cases occurring per year worldwide¹. Ten countries, including Afghanistan, Algeria, Colombia, Brazil, Iran, Syria, Ethiopia, North Sudan, Costa Rica and Peru, together account for 70 to 75% of the global estimated CL incidence¹. In Brazil, from 2008 to 2012, a mean of 21,736 new cases per year of tegumentary leishmaniasis were reported². CL may manifest as single or multiple skin lesions, which occur in the same region or disseminated in different body regions, and can have a severe impact on the patient's quality of life³,⁴.

Cutaneous leishmaniasis treatment accelerates cures, reduces scarring and relapses, and it is expected that it may reduce the frequency of disease dissemination to the upper airway mucosal surfaces. Parenteral antimony is still the standard of care in many countries. However, the once daily intramuscular or intravenous injection over 20 days normally causes discomfort to patients and it is difficult to administer in some poorly resourced countries or regions. Moreover, antimony-based compounds are toxic drugs and may cause serious and life-threatening events, such as acute pancreatitis and cardiac arrhythmias. Frequently, patients have formal contraindications to antimony use, such as uncontrolled diabetes mellitus, liver or heart disease, and chronic kidney disease. These conditions are more common in older patients, appearing after a few days of drug administration and when higher doses are required. Other treatment options include pentamidine and amphotericin B, which are both injectable and have a safety profile that is similar to antimony and the lipid formulations of amphotericin B, wich are expensive optionsfor the majority of the CL endemic countries. Various studies evaluated oral drugs as candidates for CL treatment, such as miltefosine⁵–⁷, fluconazole⁸,⁹, and azithromycin¹⁰–¹⁵, with controversial results or no clear evidence of efficacy.

Azithromycin, an azalide antibiotic is largely used to treat bacterial infections, and was identified as a potential option for CL treatment due to its wide tissue distribution and high intracellular concentration, including macrophages¹⁶. Three studies showed that azithromycin was active against Leishmania parasites. Krolewiecki et al¹⁷ showed both in vitro and in vivo activity of azithromycin against Leishmania (Leishmania) major promastigote and amastigote forms¹⁷. Tanyuksel et al¹⁸ demonstrated in vitro the potential leishmanicidal effect of azithromycin on intracellular amastigote L. (L.) major forms in peritoneal macrophages from mice¹⁸. Lastly, Oliveira-Silva et al¹⁶. showed that azithromycin was active in vitro against Leishmania (Leishmania) amazonensis, Leishmania (Viannia) braziliensis, and Leishmania (Leishmania) chagasi and suggested that the drug might offer an alternative to current leishmaniasis treatments¹⁶.

Despite these promising in vitro results, clinical studies of azithromycin and CL had controversial results. Prata et al.¹³ showed a cure rate of 85% in an open non-controlled trial with 20 patients¹³. Four studies in Brazil showed low efficacy of azithromycin when compared with meglumine antimoniate¹⁰,¹⁴,¹⁵. Two others studies evaluated azithromycin against Old World leishmaniasis, both with poor responses¹¹,¹². These studies enrolled a small number of volunteers, 22 to 49, with varied clinical protocols, restraining a definitive conclusion regarding the possible role of azithromycin as a therapeutic option for CL. The aim of this study was to evaluate the efficacy and safety of oral azithromycin for CL treatment compared with injectable meglumine antimoniate.

METHODS

Study population

Treatment-naïve patients with localized cutaneous leishmaniasis were included in the study after signing the informed consent form if they met the following inclusion criteria: 1) age between 14 to 65 years; and 2) ≤ 6 apparent cutaneous lesions that were compatible with CL and a positive Montenegro reaction test (≥5mm), followed by parasitological or molecular confirmation of the CL infection (which included a direct exam, culture, pathological exam, and/or kinetoplast deoxyribonucleic acid (kDNA) detection by polymerase chain reaction). L. (Viannia) braziliensis was the species identified in deoxyribonucleic acid (DNA) samples extracted from biopsy fragments of 29 patients. Leishmania (Viannia) braziliensis is the most common species found in the patients at the study reference center (>90%) (unpublished data) and in the study-area (92.5%)¹⁹.

Patients who had or met one of the following criteria were not eligible to participate: disseminated leishmaniasis; the presence of mucosal lesions; pregnancy [confirmed by beta human chorionic gonadotropin (β-hCG) in their blood sample]; breast feeding; diseases that interfere with scar healing; primary or acquired immunodeficiency; immunosuppressive drug use; use of any topical or oral medication that could interfere with the healing process or with potential leishmanicidal action, including antibiotics; decompensated chronic diseases; any electrocardiogram (ECG) abnormalities that contraindicated meglumine antimoniate use; use of any medication that could prolong the QTc interval; any diseases or conditions that may lead to non-compliance to protocol, including alcohol abuse; and intolerance to azithromycin, macrolides or meglumine antimoniate.

Study design

This multicenter, randomized, open-label, 2-arm parallel group, non-inferiority clinical trial was conducted in two leishmaniasis reference centers: The René Rachou Research Centre/Oswaldo Cruz Foundation (CPqRR/FIOCRUZ), and Montes Claros State University (Unimontes). Both centers are located in Minas Gerais, Brazil. Randomization used blocks of six and a 1:1 allocation rate were generated by using the Web site Randomization.com [http://www.randomization.com]. Envelopes that were sequentially numbered, opaque and sealed were provided to the local clinical coordinator. Allocation followed the recruitment sequence, and the patient's name was written on the envelope before it was opened.

Eligible patients were allocated into one of the two treatment arms: Group A (meglumine antimoniate) or group B (azithromycin). The group A patients were treated, according to the Brazilian Ministry of Health recommendation, with 15mg/kg/day of intravenous or intramuscular meglumine antimoniate (maximum daily dose of 1,215mg) over 20 consecutive days (Glucantime® - Aventis, batch number: 605022). The group B patients were orally treated with one 500mg azithromycin tablet per day over 20 consecutive days (Zitromax® - GSK, batch numbers 6186401403; 0864009). All of the treatments were performed in an ambulatory setting.

Treatment adherence for both treatment groups was supervised daily by the health professionals of the public ambulatory unit that was closest to each patient's home. Additionally, all of the drug administration was registered in a specific form and signed by the health professional under close supervision of the study team.

Treatment was considered incomplete if it was interrupted before the 16^th dose or if the treatment lasted for more than 30 days. A treatment was considered irregular if there was an interval greater than 72h between any drug doses.

Safety and efficacy evaluations

Clinical evaluations, which included vital signs and laboratory tests, (including complete blood cell counts, biochemistry tests, urinalysis, and a 12-lead ECG) were assessed at enrollment, during treatment (days 5, 10, and 20), and 10 days after treatment. A clinical evaluation was also performed at months 1, 2, 3, and 6 after treatment. The lesion areas were measured using a 0.1 cm precision caliper, and the following formula was applied: D1 x D2 x π/4, where D1 and D2 are the greatest and smallest diameters, respectively. Photographs were taken to record the lesion evolution.

To assess safety, clinical and laboratorial adverse events were investigated on an outparient basis. The participants were withdrawn from the study if the patient presented with a severe or life threatening event or if the investigator was concerned about treatment safety.

The primary efficacy end point was CL cure rate by intention-to-treat (ITT) and per protocol (PP) analyses. A cure was defined as complete lesion healing and re-epithelialization without inflammatory infiltration and erythema until 90 days after the treatment ended. Patients withdrawn from the study due to AEs or loss to follow-up were considered treatment failures in the ITT analysis.

The secondary endpoints were as follows: a delayed CL cure (180 days after treatment), CL recurrence between cure and 180 days after treatment, and the percentage of healed lesions at the end of treatment and at 30, 60, and 90 days after the treatment ended. Recurrence was defined by the reappearance of a previous lesion or a new cutaneous or mucosal lesion. Patient lost to follow-up were considered as recurrences in the ITT analysis. All of the secondary efficacy endpoints were analyzed by ITT and per protocol (PP).

The safety analysis included all patients who received at least one dose of study drugs. Clinical, laboratory and ECG abnormalities were categorized according to the acquired immunodeficiency syndrome (AIDS) clinical trial group (ACTG) criteria.

Patients who did not respond to azithromycin were treated with the standard therapy with meglumine antimoniate, the same regime of the group A arm, or second-line drugs, if necessary.

Statistical analysis

Initially, a sample size of 310 patients in each group was calculated using an accuracy method, with an alpha error = 0.05 and a power = 0.8, and considering a 60% cure rate in both arms. The inferior limit of the 95% confidence interval (one-sided) between the azithromycin and meglumine antimoniate cure rates should not have been less than -10% in order to consider the azithromycin treatment as non-inferior. The final sample size was 682 patients, which took into consideration a possible loss of follow-up period of 10%.

The data were summarized as frequencies and percentages for categorical variables and as the means ± standard deviation (SD) for continuous variables. Fisher's exact test (two-sided) and a two-sample t-test were used to compare the differences between the groups for the categorical and continuous variables, respectively. P-values lower than 0.05 were considered statistically significant. The statistical analysis was made using the Statistical Package for the Social Sciences (SPSS) Statistics software - version 19 (IBM, US).

Due to the high failure rate in the azithromycin group, the principal investigator, in accordance with the Institutional Sponsor, requested an evaluation of an external ad-hoc Review Board, which recommended a trial interruption. No new inclusions were conducted and the enrolled patients were followed according to the protocol.

Ethical considerations

The clinical study protocol and informed consent were reviewed and approved by the Rene Rachou Research Centre, Oswaldo Cruz Foundation [Centro de Pesquisa René Rachou, Fundação Oswaldo Cruz (CPqRR, FIOCRUZ)], (CAAE 0010.0.246.000-06/CEPSH-CPqRR 20/2006) and Montes Claros State University - Unimontes (Comitê de Ética em Pesquisa da Universidade Estadual de Montes Claros 2050) ethics committees. The Brazilian National Council on Ethics in Research (CONEP) accredits these committees. The project has also been approved by the Ethics Review Committee of the University of Brasilia from where a third trial site was expected to be coordinated but was cancelled due to the study interruption. The clinical study was conducted in accordance with the Good Clinical Practice (ICH 1996) and Brazilian National Health Council (CNS) resolutions 196/1996 and 251/1997. The study is registered at www.Clinicaltrials.gov (NCT00682656). Written informed consent was obtained for every subject prior to enrollment. For patients younger than 18 years of age, a written informed consent was also obtained from their legal representative. All of the subjects were informed about the nature of the trial and possible risks bound to it and that they were free to withdraw the consent of participation at any time. The investigators and study staff observed the confidentiality of the records.

RESULTS

Seventy-seven patients were screened and 48 volunteers with confirmed CL were enrolled between August/2008 and September/2011. These included 43 subjects at Belo Horizonte and five at Montes Claros. The last 6-month follow-up visit was conducted on March 2012.

Table 1 shows the baseline demographic and clinical characteristics. The majority of the subjects were male (38 - 79.2%), their ages ranged from 15 to 56 years (mean 34.5 ± 12.2), and their years of schooling ranged from 2 to 17 years (mean 8.3 ± 3.7). Almost 2/3 of the patients had only one lesion, and the time since the first lesion occurred ranged from 15 to 425 days (mean 98.6 ± 67.5). Additionally, the lesions of 29 (61.7%) patients had ≤ 90 days of progression. The mean lesion area was 5.17 cm² (SD =10.11). There were no baseline demographic and clinical characteristic differences between both groups.

TABLE 1
The baseline demographic and clinical characteristics of each group.

Variables	Meglumine antimoniate		Azithromycin		Total (n=48)
	Group A (n=24)		Group B (n=24)
	n	%	n	%	n	%
Male - N (%)	19	79.2	19	79.2	38	79.2
Mean age - years (SD)	34.5	11.7	34.4	13.1	34.5	12.2
Mean years of schooling (SD)	8.6	3.4	7.9	4.1	8.3	3.7
Mean lesion number (SD)	1.9	1.2	1.3	0.8	1.6	1.0
One lesion N (%)	12	50.0	19	79.2	31	64.6
Lesion area - cm2 (SD)	6.11	13.22	3.95	2.93	5.17	10.11
Mean time (days ) since first lesion (SD)	109.2	85.3	87.6	41.0	98.6	67.5
Lesion number within < 3 months (%)	13	54.2	16	69.6	29	61.7

• SD: standard deviation.

Figure 1 shows the participants treatments and their follow-ups. Twenty-four participants were enrolled in each treatment group. Four subjects from the meglumine antimoniate group withdrew during treatment due to adverse events. All of the patients enrolled in the azithromycin group completed their treatment. During the 3 months post-treatment, five patients were lost to follow-up, which included three from the azithromycin group and two from the meglumine antimoniate group. Six patients were initially considered as failures; however, they were cured between 3 and 6 months after their treatments ended. These included two in the azithromycin group and four in the meglumine antimoniate group (Figure 1).

FIGURE 1
Enrollment, treatment, and follow-up of the study subjects. ITT: intention-to-treat; PP: per protocol.

Table 2 shows the primary and secondary efficacy endpoints. Three months after the end of the treatments, the meglumine antimoniate group had a higher cure rate than the azithromycin group in the ITT and PP analyses, (54.2% versus 20.8% [relative risks (RR) 1.97; 95% confidence intervals (95%CI) 1.13-3.42] and 72.2% versus 23.8% [RR 3.03; 95%CI 1.34-6.87], respectively). Similar results were observed with the late cure rate (6 months after the end of the treatments). Four cured patients were lost to follow-up between 3 and 6 months after treatments. No clinical recurrence was documented among the patients who effectively returned for their last follow-up visit.

TABLE 2
Primary and secondary study endpoints.

Endpoint	Meglumine antimoniate		Azithromycin		p-value*	RR (95%CI)
	Group A		Group B
	n	%	n	%
Cure 3 months after treatment (ITT)	13/24	54.2	5/24	20.8	0.036	1.97 (1.13-3.42)
Cure 3 months after treatment (PP)	13/18	72.2	5/21	23.8	0.004	3.03 (1.34-6.87)
Cure 6 months after treatment (ITT)	16/24	66.7	7/24	29.2	0.20	2.17 (1.16-4.09)
Cure 6 months after treatment (PP)	16/17	94.1	7/21	33.3	<.001	10.4 (1.54-70.7)

• RR: relative risk; 95%CI: 95% confidence interval; ITT: intention-to-treat; PP: per protocol.
• ^*
  Fisher's exact test (2-sided).

As shown in Table 3, considering the cured patients, despite the the higher percentage of healed lesions when the treatment was completed and 30 days after treatment completion in the meglumine antimoniate group, there were no significant differences between the groups regarding healing speed.

TABLE 3
The percentage of healed lesions at treatment completion and at days 30, 60 and 90 after treatment completion.

Time	Meglumine antimoniate (n=13)		Azithromycin (n=5)		p*
	Group A		Group B
	n	%	n	%
End of treatment	1	7.7	0	0.0	<0.001
30 days post-treatment	8	61.5	1	20.0	>0.05
60 days post-treatment	12	92.3	4	80.0	>0.05
90 days post-treatment	13	100.0	5	100.0	>0.05

• ^*
  Fisher's exact test (2-sided).

No unexpected adverse events (AE) were observed during the study. A total of 24 patients reported 62 AEs that were possibly related or related with the study drugs, [15 (62.5%) in the meglumine antimoniate group and nine (37.5%) in the azithromycin group (p=0.039; RR=2.188 - 95%CI 1.040-4.603)]. The AEs were more frequent in the meglumine antimoniate group (49 events) compared with the azithromycin group (13 events). Regarding severity, the majority (51/62; 82.5%) of the AEs were considered mild; however, nine (14.5%) were moderate and two (3.2%) were severe (e.g., malaise and vomiting). There were no significant differences between the groups. No life threatening conditions were observed during the treatments. The AEs were diverse between the groups (Table 4). The most frequent AEs in the meglumine antimoniate group were myalgia (22.4%), arthralgia (18.4%), and malaise (8.1%). In the azithromycin group, they were diarrhea (30.8%) and abdominal pain (23.1%).

TABLE 4
Adverse events related or possibly related to the study drugs.

Adverse event	Meglumine antimoniate		Azithromycin		Total
	Group A		Group B
	n	%	n	%	n	%
Myalgia	11	22.4	0	0.0	11	17.7
Arthralgia	9	18.4	0	0.0	9	14.5
Nausea/vomits	5	10.2	2	15.4	7	14.5
Malaise	5	10.2	0	0.0	5	8.1
Headache	4	8.2	0	0.0	4	6.5
Diarrhea	0	0.0	4	30.8	4	6.5
Pain in the arms	4	8.2	0	0.0	4	6.5
Abdominal pain	0	0.0	3	23.1	3	4.8
Constipation	0	0.0	2	15.4	2	3.2
Gastric discomfort	0	0.0	2	15.4	2	3.2
Others	11	22.1	0	0.0	11	17.7
Total	49	100.0	13	100.0	62	100.0

DISCUSSION

Until now, few studies have tested azithromycin as an alternative treatment for CL¹⁰–¹²,¹⁴,¹⁵. Only one study was a randomized clinical trial that compared oral azithromycin and meglumine antimoniate for the treatment of CL in Americas, which included 23 patients in each study group. The authors concluded that azithromycin had a moderate efficacy against L. (V.) braziliensis (45.5%) and suggested that a subset of patients could benefit from this therapeutic option¹⁰.

Nonetheless, a number of reasons supported the decision to compare oral azithromycin and meglumine antimoniate in Brazil and to design a larger randomized non-inferiority trial to test a cure rate difference of not less than -10% that could allow the registration of a new use for azithromycin by the Brazilian regulatory agency [Agência Nacional de Vigilância Sanitária (ANVISA)]. It is a consensus that new treatments are urgently needed to improve adherence, cost, cure rates, safety and quality of life. Additionally, there is a concern regarding antimoniate resistance and the need of a safer and better-tolerated treatment²⁰,²¹. Azithromycin is an oral and welltolerated drug with the important advantage of low cost, and oral treatments could improve access and adherence. Moreover, if a moderate efficacy was to be proven, further analysis could identify subsets of patients to whom an oral, less expensive and safer drug could be first offered.

Unfortunately, the high clinical failure rate of azithromycin led to the premature interruption of this study. Even with the small number of patients included until the study interruption, the analysis was able to show the inferiority of azithromycin compared with meglumine antimoniate in the ITT and PP analyses.

The dosing regimen for azithromycin was chosen to allow the comparison with the standard schedule of meglumine antimoniate at a dose with predictable good tolerance for the 20 days treatment, a longer duration than the usual prescription for bacterial infections. Krolewiecki et al.¹⁰ used azithromycin for 28 days: one gram in the first day and 500mg for the following 27 days. A second cycle at the same doses and lasting 15 days was indicated for patients with clinical improvement without resolution 14 days after completing the first cycle. This dosing difference and the geographical parasite and/or host specificities may have contributed for the slight higher cure rate observed by those authors compared with our observed cure rate (45.5% vs. 33.3%)¹⁰.

The number of patients presenting AEs and the frequency of those effects were higher in the group treated with meglumine antimoniate, although the severity grade was defined as mild for the large majority in both groups. In the azithromycin group, there were a predominance of gastrointestinal AEs and more diverse systemic effects were observed in the meglumine antimoniate group.

In conclusion, the present study showed that azithromycin is not effective in CL treatment in an area where L. braziliensis is the predominant parasitic species and does not seem to have a role in the therapeutic arsenal for CL in this particular setting. A careful evaluation should be mandatory for future decision making on the need of new clinical trials using azithromycin alone or in combination with other drugs for CL.

CONFLICT OF INTEREST

The authors declare that there is no conflict of interest.

FINANCIAL SUPPORT

This work was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) and Fundação Oswaldo Cruz (FIOCRUZ). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

ACKNOWLEDGMENTS

We thank Rosiane Estéfane da Silva, Andréia Coutinho de Faria, Maria Camilo Ribeiro Senna, Tatiana Camilo Ribeiro de Senna and Letícia de Melo Mota for collaborating on this project and for the technical assistance.

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Publication Dates

• Publication in this collection
  Nov-Dec 2014

History

• Received
  31 Oct 2014
• Accepted
  8 Dec 2014