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AtoZ-CRO GmbH is a German full-service clinical research organization (CRO) located in Overath near Cologne. We provide comprehensive outsourcing solutions to the global life science industry. The company has more than 35 years expertise in Clinical Studies, Monitoring, Pharmacovigilance, Biometry and Regulatory on a national and international level.

Beside long-lasting partnerships with high-rated business partners in North America, Asia and Africa, AtoZ-CRO GmbH has a substantial presence in Western- and Eastern-Europe, here offering a state-of-the-art Early Phase Unit, as well as fast and consistent patient recruitment.

The company serves clinical trials for pharmaceuticals and radiopharmaceuticals (Phase I – IV), medical devices, nutritionals and cosmetics, in particular for small and mid-sized pharmaceutical, biotech, medtech, nutritional and cosmetic companies.

Our highly flexible, qualified and motivated staff advances all customer projects with high quality, short communication ways and a quick decision-making.

Company Background

Founded in 1984, in February 2007 Dr Karl-Peter Klein took over as Managing and Medical Director of AtoZ-CRO and led the activities of the company to new dimensions.

Based on the company’s long-established international experience in clinical trial management and cooperation with high-rated business partners, AtoZ-CRO is proud to offer a broad range of services covering all clinical research needs, in particular for small and mid-sized pharmaceutical, biotech, medtech, nutritional and cosmetic companies, from the planning stages to the final integrated study report.

To visit the AtoZ-CRO website click here:

Contact details

Hauptstr. 77
51491 Overath

Tel: +49 (0) 2206 95 99 0
Fax: +49 (0) 22 06 9 59 9 29

Clinical Research Phase I – IV

From its head office in Overath, Germany, AtoZ-CRO manages and coordinates clinical studies of phase I to IV and post-marketing studies for national and international clients. The company has successfully closed rescue studies and feasibility studies as well. AtoZ-CRO GmbH covers German-speaking countries and Europe with a special focus in Eastern Europe. We have longstanding…


The AtoZ-CRO is not only a specialist in planning but also in conducting clinical studies. Amongst others it offers the recruitment and assessment of study centers, training of investigators and their staff, monitoring the study centers incl. source data check as well as reporting, communication with investigators and the sponsor and supplying the study centers…

Short time patient recruitment

Since its founding in 1984, AtoZ-CRO formed a network of motivated local monitors and investigators in Germany, Western and Eastern Europe, the USA, Asia and Africa. Close collaborations with leading professionals, guarantee very short recruitment periods and highly motivated investigators with experienced staff at study sites. Moreover, studies in Eastern Europe offer the advantage of…


The collating, processing, analyzing and notifying of ADRs during clinical studies is key and one of AtoZ’ competences. The submission of SUSARs and ICSR to European Regulatory Authorities and CECs is done as well as the specialization as an EMA certified safety monitoring for E2B submissions of SUSARs and ICSRs. Medical, clinical and safety regulatory…

Biometry & Statistics

Our partners in the EU and in the USA provide clients with integrated, global, therapeutically aligned, end-to-end biostatistics services through all stages of the clinical trial development, i.e. planning, execution, reporting & interpretation and submission. Our partners are constantly looking for optimal statistical methods in both the design of clinical trials as well as their…


Due to our global alliances, we have partners in place for full regulatory affairs support. Via our partners we are providing complete solutions for marketing medicines predominantly in the European Union, taking care of all pharmaceutical responsibilities and activities. For new marketing authorisations, we develop custom-tailored regulatory strategies. Based on our long-time experience with many…


At AtoZ-CRO, the core business principle is to serve the customer with the highest flexibility and to fulfil customer requirements as specifically as possible. AtoZ continuously strives to provide services of the highest quality and greatest value with respect to legal compliance and to the satisfaction of the sponsor and authorities. The company has its…

Additional services

Phase 0 Studies Feasibility Studies Rescue Studies Post-marketing Studies e.g. NIS, PASS, PAES Professional Staffing Procurement of Investors Trainings & Seminars ICH-GCP Basic & Refresher Training for Investigators Study Nurses and CRAs Basic Monitoring Training Communication in Clinical Trials Seminar
Quick Contact AtoZ-CRO
Quick Contact AtoZ-CRO
Quick Contact AtoZ-CRO

Quick Contact AtoZ-CRO
Quick Contact AtoZ-CRO
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