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Erschienen in: Wiener klinische Wochenschrift 9-10/2021

Open Access 04.01.2021 | review article

Development of sustainable research excellence with a global perspective on infectious diseases: Centre de Recherches Médicales de Lambaréné (CERMEL), Gabon

verfasst von: Michael Ramharter, Selidji T. Agnandji, Ayôla A. Adegnika, Bertrand Lell, Ghyslain Mombo-Ngoma, Martin P. Grobusch, Matthew McCall, Riko Muranaka, Andrea Kreidenweiss, Thirumalaisamy P. Velavan, Meral Esen, Frieder Schaumburg, Abraham Alabi, Christiane Druml, Benjamin Mordmüller, Carsten Köhler, Peter G. Kremsner

Erschienen in: Wiener klinische Wochenschrift | Ausgabe 9-10/2021

Summary

Medical research in sub-Saharan Africa is of high priority for societies to respond adequately to local health needs. Often enough it remains a challenge to build up capacity in infrastructure and human resources to highest international standards and to sustain this over mid-term to long-term periods due to difficulties in obtaining long-term institutional core funding, attracting highly qualified scientists for medical research and coping with ever changing structural and political environments. The Centre de Recherches Médicales de Lambaréné (CERMEL) serves as model for how to overcome such challenges and to continuously increase its impact on medical care in Central Africa and beyond. Starting off as a research annex to the Albert Schweitzer Hospital in Lambaréné, Gabon, it has since then expanded its activities to academic and regulatory clinical trials for drugs, vaccines and diagnostics in the field of malaria, tuberculosis, and a wide range of poverty related and neglected tropical infectious diseases. Advancing bioethics in medical research in Africa and steadily improving its global networks and infrastructures, CERMEL serves as a reference centre for several international consortia. In close collaboration with national authorities, CERMEL has become one of the main training hubs for medical research in Central Africa. It is hoped that CERMEL and its leitmotiv “to improve medical care for local populations” will serve as an inspiration to other institutions in sub-Saharan Africa to further increase African capacity to advance medicine.
Hinweise

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Since its foundation, the Centre de Recherches Médicales de Lambaréné (CERMEL) has made a remarkable change from a research department of a small non-governmental hospital in semi-rural Gabon to one of the leading research institutions for tropical medicine in Central Africa. For institutions striving to contribute sustainably to people’s health in sub-Saharan Africa, CERMEL may serve as a role model. Here, the institutional history of CERMEL is presented with landmark activities and challenges in the quickly evolving environment of clinical research in sub-Saharan Africa.
In 1913, the first hospital in Lambaréné was founded by Albert Schweitzer. Schweitzer, the 1952 Nobel Peace Prize laureate, early on expressed his belief that routine medical practice in Africa had to be accompanied by medical research. It was in the 1970s that a new hospital complex was constructed after Schweitzer’s death, and it was only in 1981 that the first research department was founded as an annex to the modern Albert Schweitzer Hospital (Fig. 1). During that period, a collaboration with the Bernhard Nocht Institute for Tropical Medicine in Germany, was established to perform first epidemiological surveys in the central region of Gabon.
In 1992 Peter G. Kremsner, who had been affiliated with the Institute for Tropical Medicine in Berlin and later became Professor for Tropical Medicine, Travel Medicine and Human Parasitology at the University of Tübingen, Germany, was appointed Scientific Director of the International Foundation of the Albert Schweitzer Hospital. A new building with modern laboratories was inaugurated in 2006, which considerably boosted improved clinical and laboratory research capacity. Increases in projects, staff and funding made the department internationally recognized with an impact beyond the hospital’s healthcare activities (Fig. 2). In 2011, this research department finally became legally independent, and became the Centre de Recherches Médicales de Lambaréné (CERMEL). Since then, CERMEL has kept on expanding its scope by participating in internationally funded research programs and became an international medical research hub with more than 200 national and international staff members. Main funding sources are the European Union (EU), especially with its European Developing Countries Clinical Trials Partnership (EDTCP), the German Federal Ministry of Education and Research, prominently via the German Center for Infection Research and the Bill and Melinda Gates Foundation. Besides these funding organizations, several mid-term to long-term research programs were conducted with funding from international drug developers and non-profit organizations such as Medicines for Malaria Venture (MMV). In addition, strong Gabonese national support was given by provision of generous infrastructure.

Antimalarial drug trials and combination therapies

The first and most recognized activity of CERMEL is the clinical development of antimalarial drugs and antimalarial combination therapies in light of the threat of increasing drug resistance of Plasmodium falciparum malaria in Central Africa. Over the past three decades, CERMEL was engaged in the clinical development of most antimalarial drugs currently marketed and in clinical use in the world today.
CERMEL was the first to report chloroquine resistance in Gabon in 1984 [1]. This finding later led to the evaluation of clindamycin monotherapy and combination therapies of clindamycin-chloroquine and clindamycin-quinine for the treatment of chloroquine-resistant falciparum malaria [27]. Atovaquone-proguanil [810], arteflene [11] and sulfadoxine/pyrimethamine [12] were developed and evaluated for therapeutic as well as prophylactic use. CERMEL was also among the first African centres to develop artemisinin-based combination therapies, the current international standard for malaria chemotherapy. Those studies included the very first clinical trial of artesunate-amodiaquine [13], as well as artesunate-clindamycin [14], artesunate-mefloquine [13], fixed-dose artesunate-pyronaridine [15] and artesunate-fosmidomycin [16] as well as comparison of several of those [17] for uncomplicated P. falciparum malaria in African children. The first randomized trial of tafenoquine prophylaxis for P. falciparum malaria in the endemic area was also conducted by CERMEL [18]. Based on these first trials and subsequent drug development programs, tafenoquine became registered for malaria prevention and for radical cure of P. vivax infections [19].
In parallel, several new antimalarial compounds were developed as single or combination therapy in phase I–II clinical trials, such as fosmidomycin [2022], clindamycin-fosmidomycin, [16, 2327], piperaquine-fosmidomycin [28], chlorproguanil-dapsone [29], ferroquine and ferroquine-artesunate combinations [3032]. In recent years, the compounds with new modes of action, such as artefenomel, ganaplacide and cipargamin [33] were tested at CERMEL. At the same time, single-dose therapies for malaria to improve patient adherence to therapeutic regimens were evaluated [33, 34]. Importantly, this clinical research was complemented by series of trials assessing simplified regimens for parenteral artesunate in severe malaria [35, 36].
As antimalarial drug development in vulnerable populations became a further public health priority [37], trials using quinine monotherapy for pregnant African women [38], and sulfadoxine-pyrimethamine as prophylactic treatment in infants and mefloquine in pregnant women [3943] were conducted as priorities. This rich research portfolio made CERMEL globally known as a leading centre for antimalarial drug development focussing on the needs of African populations.

Vaccine trials for malaria and other infectious diseases

In addition to the antimalarial drug development, CERMEL is dedicated to the development of new vaccines. The first vaccine trial conducted at CERMEL was the assessment of vaccines against typhoid fever and cholera [44]. Partnering with 10 research centers in sub-Saharan Africa, CERMEL participated in phase II trials and the pivotal phase III trial to assess the safety, immunogenicity and efficacy of the RTS,S/AS01 malaria vaccine, which later became the first marketable vaccine against malaria and a human parasitic disease of any kind recommended by the European Medicines Agency in 2015 [45]. Since then, several other malarial vaccine candidates including whole attenuated P. falciparum sporozoite vaccine candidates (PfSPZ) have been assessed in multiple clinical trials [4649].
With the growing research capacity, vaccine trials for diseases other than malaria started to be conducted at CERMEL. One highlight was the first phase I clinical trial of the Ebola surface glycoprotein vaccine vectored with the recombinant vesicular stomatitis virus (rVSV∆G-ZEBOV-GP). The good safety and immunogenicity data from this trial supported the decision to conduct a phase III trial in the West African countries affected by the Ebola outbreak of 2014–2016, and which led to the availability of the first Ebola vaccine in experimental use in the Western and Central African outbreaks in 2018–2019 [5057]. The rVSV∆G-ZEBOV-GP vaccine became the world’s first approved Ebola vaccine by the European Medicines Agency (Ervebo®) in November 2019. Further clinical trials to characterize immune and molecular signatures by rVSV∆G-ZEBOV-GP in pediatric and adult populations are being conducted.
Other fields of vaccine development included the evaluation of recombinant Na-APR‑1 (M74) and Na-GST‑1 hookworm vaccine candidates as well as postmarketing trials assessing the impact of helminths on immunogenicity of vaccines for influenza, meningitis and cholera [5862].

Diagnostic studies for malaria and schistosomiasis

Thick blood smear microscopy, still the gold standard in malaria testing endorsed by WHO, was optimized in the early days of the CERMEL by describing the so-called Lambaréné method [63]. With this method quick and accurate quantification of malaria parasite densities in a patient’s blood is possible, even under basic laboratory conditions. In the Severe Malaria in African Children (SMAC) network of which CERMEL was a founding member, a series of studies were performed to identify risk factors of pediatric mortality in Africa. This is the largest study of severe malaria in history [6466]. In the SMAC network new treatment regimens of parenteral artesunate were established for severe malaria [35, 36]. For better identification of children at highest risk of death from severe malaria, the Lambaréné organ dysfunction score (LODS) was developed [67], which is a simple scoring tool to predict the prognosis based only on three clinical factors, which are coma, prostration and deep breathing.
With funds from the European Developing Countries Clinical trial Partnership and German Center for Infection Research (DZIF), a series of Schistosoma antigen-based tests are being systematically studied in pregnant women and young children to improve schistosomiasis management of vulnerable populations. Responding to calls from the Federal Ministry of Economic Cooperation and Development of Germany (BMZ), CERMEL initiated a project on capacity building for fever management with focus on nonmalarial fever and antimicrobial resistance. This initiative led to the establishment of the national network for antimicrobial resistance in Gabon. Internationally, CERMEL became a key partner of the Organisation for Coordination and Cooperation in the Fight against Major Endemics in Central Africa (OCEAC) to control antimicrobial resistance in sub-Saharan Africa. CERMEL became an advisor of OCEAC for neglected tropical diseases.

Clinical research in tuberculosis

Tuberculosis is one of the top causes of mortality worldwide, especially in HIV co-infected patients. To respond to more diverse and complicated cases of tuberculosis, a dedicated tuberculosis unit was established in 2009 at CERMEL. With support from the European Developing Countries Clinical Trial Partnership and the Bill and Melinda Gates Foundation, the German Center for Infection Research, and other funding bodies, the unit came to have a fully equipped tuberculosis diagnostic and research laboratory comprising smear microscopy, solid and liquid cultures and the full spectrum of molecular diagnostic and drug-resistant testing tools including GenXpertTM (GenXpert, Cepheid, Sunnyvale, CA, US).
Continuous training of staff made it possible to sustain high-level laboratory services. In parallel, a comprehensive tuberculosis treatment consultancy system was established by a collaboration of clinicians and researchers at CERMEL. In collaboration with the National Tuberculosis Program the epidemiology of tuberculosis of the region was assessed [68]. This work promoted the understanding of the actual problem of multidrug-resistant tuberculosis (MDR-TB) in Gabon [69] and the findings led the government to act and improve the management of tuberculosis nationwide.
The MDR-TB ward was opened at Georges Rawiri Hospital (CHGR) in Lambaréné with the help of CERMEL to isolate patients and to provide training for nurses and physicians. Here, the so-called Bangladesh treatment regimen was assessed before it was officially recommended by the WHO as a standard of care. Based on these efforts, Gabon obtained for the first time support from the Global Fund for the national tuberculosis diagnosis and treatment program. Meanwhile, CERMEL became the national reference centre for tuberculosis diagnosis and later the primary recipient of the Global Fund program.
Tuberculosis treatment in the Moyen Ogooué Province around Lambaréné [70] and the socioanthropological determinants of tuberculosis control in Gabon [71] as well co-infections of HIV and tuberculosis were investigated [72]. These studies raised concerns for the quality of pediatric tuberculosis patients care [73] and the timely access to the second-line drugs for drug-resistant tuberculosis in Gabon [74]. To further improve patient adherence with treatment regimens a novel e‑Health tool is under development with support from the German Ministry for Economic Cooperation and Development.

Clinical research on neglected tropical diseases

Clinical research on neglected tropical diseases (NTD) has been CERMEL’s research agenda since the 1990s with focus on Schistosoma haematobium, intestinal helminths, filarial and parasitic coinfections [7579]. Studies assessing the burden of parasitic infections among pregnant women and children were performed [8083]. Recently, a comprehensive disease burden of Loa loa, the African eye worm, was conducted to illustrate the clinical spectrum of the disease for the first time in Central Africa [84]. Interventional studies of repurposed drugs or alternative drug regimens for several neglected tropical diseases were performed, such as an assessment of the efficacy of albendazole to treat Ascaris lumbricoides, Trichuris trichiura and hookworm [85]. Similarly, mefloquine was evaluated as a potential alternative treatment for urogenital schistosomiasis in pregnant women [86]. Currently, innovative sequential treatment protocols for loiasis are being assessed. Additional studies investigating the influence of helminth infection on vaccine immunogenicity were conducted and supported by the Bill and Melinda Gates Foundation and the European Developing Countries Clinical Trial Partnership [6062]. Projects to investigate the impact of helminth infections on pregnancy and birth outcomes are ongoing.

Human infection models (CHIM) and insectarium

In addition to the classical observational studies and clinical trials, CERMEL started to employ controlled human infection models as new approach to infectious disease research. Here, healthy volunteers are deliberately exposed to an infectious agent to study the pathophysiology, immunology and transmission of human disease as well as to test novel preventive measures, such as vaccines and treatments. When the strict safety and ethical premises that are required for CHIM studies are met, a particular strength of the method lies in the definition of the timing and dose of inoculation, which enables clinical studies to be much smaller, shorter and thus more affordable than those by natural infection [87]. The use of CHIM is now well-established in medical sciences [87] to the extent that results of CHIM are now accepted in regular phase 3 clinical trials for regulatory processes [88]1.
In 2014, in part due to the active support from the Bill and Melinda Gates Foundation, the CERMEL became one of the first centres in Africa to perform CHIM. This study was to assess the effect of naturally acquired immunity and of sickle-cell trait on susceptibility to infection and disease [89]. This study demonstrated CERMEL’s capacity to stem the intensive logistical and clinical management, aseptically formulating an inoculum and providing continuous high-level diagnostic laboratory support. This led to follow-up studies using CHIM in malaria to assess efficacy of the malaria vaccine candidate GMZ2 [90] and whole cell immunization approaches (ongoing) by repeated infection of healthy adult Gabonese volunteers. The portfolio of CHIM has recently been extended to hookworm infections (Necator americanus).
While all CHIMs conducted at CERMEL in the past were done by injecting cryopreserved malaria parasites to humans, CHIM by insect (mosquito) bite, the natural way of inoculation, is also established. In 2017, the construction of a DZIF-funded bio safety level 3 (BSL-3) insectarium was completed, which houses state of the art facilities for maintaining mosquito colonies, cell cultures and a negative pressure area for safely maintaining and analyzing mosquitoes, and experimentally infecting them with BSL‑3 category pathogens (i.e. malaria, filariasis and arboviruses). The initial focus was on P. falciparum transmission but now also includes nonfalciparum malaria and viral pathogens.

Fundamental research, clinical microbiology, and antimicrobial resistance research

CERMEL started basic research in the early 1990s, when the epidemiological landscape of the region became clearer. Facilities were continually upgraded and nowadays include laboratories for molecular biology, microbiology, cell culture and immunology as well as BSL‑3 laboratories. Due to an expansion of the microbiology facilities, culture-based methods (e.g. blood culture), antimicrobial susceptibility testing, genomic detection of resistance genes, serotyping and genotyping of bacteria have become possible to perform on site. Early scientific studies focused on the molecular epidemiology of bacterial pathogens, such as Staphylococcus aureus, extended spectrum beta-lactamase (ESBL)-producing Enterobacterales, Streptococcus pneumoniae, Shigella spp. and Legionella spp., and later newly discovered species, such as Staphylococcus schweitzeri [9197].
CERMEL’s longstanding experience in clinical and fundamental research, the availability of adequate laboratory facilities including a dedicated BSL‑3 laboratory for applied medical virology and a considerable pool of trained scientists allowed CERMEL to rapidly adapt to the emergence of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic when it arrived in the Central African region. With the assistance of the international partners and emergency funding from German funding bodies, the CERMEL rapidly established a state of the art diagnostic laboratory service for molecular diagnostics of SARS-CoV‑2. In this way CERMEL served the public health service of the Republic of Gabon in its national response to the pandemic highlighting CERMEL’s dedication to serve the health needs of local populations and benefitting the public health system of Gabon.

The health and demographic surveillance system (HDSS)

Since 2016, CERMEL hosts a health and demographic surveillance system in Lambaréné and surrounding villages. A total of 30,000 persons in 8300 households are followed up at least once per year. Verbal autopsies are done for all registered deaths. Data of the HDSS have been used as a sampling framework for various surveys including evidence-based estimates for pediatric vaccine coverage in rural Gabon.

A hub for global health networks

A training program for graduate students in medicine and natural and social sciences was established at CERMEL in collaboration with domestic and overseas universities. The main partners are the Université Omar Bongo and Université des Sciences et Techniques de Masuku (Gabon), the Congolese Foundation for Medical Research (Republic of Congo), the University Clinics and the University of Tübingen and the Bernhard Nocht Institute for Tropical Medicine (Germany), the Medical University of Vienna (Austria), the Universities of Amsterdam and of Leiden (The Netherlands), and the St. George’s University of London (UK). Based on these academic networks several hundred students, medical doctors and scientists joined CERMEL for mid-term to long-term training or have been sent by CERMEL to these academic partner institutions for capacity building programs.
Over the past decade leading scientists of CERMEL were awarded professorships at prestigious international universities in Germany (University of Tübingen and Hamburg) and Austria (Medical University of Vienna). While being appointed as full professors at these international institutions, the place of work of these professors remains at CERMEL, thus avoiding a brain-drain for Gabon and intensifying the international collaborative network. A joint initiative with the Medical University of Vienna led to the appointment of a UNESCO professorship in bioethics with an office at the CERMEL. This initiative puts research ethics in the focus of all research programs at CERMEL and assists to further strengthen bioethical oversight of research in the Central African region [98].
A close collaboration with universities in Libreville and Franceville/Masuku, together with its recognition by African and Malagasy Council for Higher Education (CAMES) has made CERMEL a regional tertiary education centre. Through a cooperation with the Gabonese national programs for malaria, tuberculosis, HIV and neglected tropical diseases, CERMEL largely contributed to improve health care for the Gabonese population. As a founding member of the Central African Clinical Research Network (CANTAM)—a network of excellence funded by the European Developing Countries Clinical trial Partnership—CERMEL has increasing responsibilities in the research landscape of the Central African subregion. Firmly embedded in African and international academic networks, CERMEL thus became known as a reliable academic partner institution in the international landscape of clinical research [99].

High-level infrastructures and sustainability of CERMEL

In the last decade, CERMEL invested in the construction of advanced infrastructure to conduct clinical trials compliant with the guidelines of the International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH). The centre expanded from a single research building to a campus with more than ten buildings dedicated to specified clinical and research facilities and administrative departments (Fig. 3).
An institutional scientific review committee (SRC) was established to ensure safety, quality and adherence to legal requirements of the research projects to be conducted on site. An institutional ethics committee was also established for the CERMEL with the help of the European Developing Countries Clinical Trials Partnership to ensure that studies always adhere to the highest ethical standards. Following the establishment of these committees, CERMEL assisted with the support of the German Academic Exchange Service (DAAD) to establish the National Ethics Committee of Gabon.

Conclusion

Starting as a research annex of a provincial rural hospital, CERMEL has been and will be committed to its philosophy to serve the local population in medicine, science and training. Medicine and global health research face continuous challenges, particularly so in Africa; however, medicine in Africa keeps on improving rapidly and due to the efforts of physicians, technical staff and scientists CERMEL is not a local research centre anymore. It became an international research centre headed by a board of directors and overseen by a dedicated board of trustees. Despite CERMEL’s inspiring development over the past decades, its leitmotiv to “improve medicine for local populations” has always remained the same.

Conflict of interest

M. Ramharter, S.T. Agnandji, A.A. Adegnika, B. Lell, G. Mombo-Ngoma, M.P. Grobusch, M. McCall, R. Muranaka, A. Kreidenweiss, T.P. Velavan, M. Esen, F. Schaumburg, A. Alabi, C. Druml, B. Mordmüller, C. Köhler, and P.G. Kremsner declare that they have no competing interests.
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Metadaten
Titel
Development of sustainable research excellence with a global perspective on infectious diseases: Centre de Recherches Médicales de Lambaréné (CERMEL), Gabon
verfasst von
Michael Ramharter
Selidji T. Agnandji
Ayôla A. Adegnika
Bertrand Lell
Ghyslain Mombo-Ngoma
Martin P. Grobusch
Matthew McCall
Riko Muranaka
Andrea Kreidenweiss
Thirumalaisamy P. Velavan
Meral Esen
Frieder Schaumburg
Abraham Alabi
Christiane Druml
Benjamin Mordmüller
Carsten Köhler
Peter G. Kremsner
Publikationsdatum
04.01.2021
Verlag
Springer Vienna
Erschienen in
Wiener klinische Wochenschrift / Ausgabe 9-10/2021
Print ISSN: 0043-5325
Elektronische ISSN: 1613-7671
DOI
https://doi.org/10.1007/s00508-020-01794-8