What Does a CRO Do? Contract Research Organizations Explained
If a pharmaceutical company discovers a promising new drug, they face a massive problem. How do they test it on thousands of patients across dozens of countries, all while following strict regulations? They hire a CRO.
Contract research organizations are the hidden engine powering clinical trials. They are specialized companies that sponsors hire to design, manage, and run their trials. The global CRO market is worth over $70 billion annually and growing.
This video from Clarity Clinical Solutions breaks down what CROs actually do.
What a CRO is
A contract research organization, or CRO, is a company that provides clinical research services to pharmaceutical, biotechnology, and medical device companies. Instead of the sponsor building their own clinical operations team from scratch, they outsource the work to a CRO that already has the infrastructure, expertise, and global reach.
The CRO industry started in the 1970s and has grown into a massive sector. Today, over 70% of all clinical trials involve a CRO. Major players include IQVIA, Labcorp, ICON, PPD, and Syneos Health.
Core services: clinical operations
Clinical operations is the heart of what a CRO does. They handle site selection, finding the right hospitals and clinics to run the trial. They manage site initiation and training. They deploy clinical research associates, or CRAs, who monitor trial sites to ensure protocol compliance and data accuracy. CRAs are the eyes and ears of the sponsor at every trial site.
Data management and biostatistics
Data management and biostatistics are critical CRO services. The CRO builds the electronic case report forms, or eCRFs, that sites use to enter patient data. They program edit checks to catch errors in real time. They manage the database lock process.
Their biostatisticians write the statistical analysis plan, run the analyses, and produce the final statistical report that goes into the regulatory submission.
Medical writing and regulatory affairs
CROs write the key documents that make a trial possible:
- The clinical study protocol
- The investigator brochure
- The informed consent form template
- The clinical study report
They also help prepare regulatory submissions, including IND applications and marketing authorization dossiers. Good medical writing can make the difference between a smooth regulatory review and a rejection.
Pharmacovigilance and safety monitoring
CROs run the safety systems that protect patients during a trial. This includes:
- Collecting adverse event data from sites
- Coding events using standard dictionaries like MedDRA
- Conducting medical review of safety data
- Submitting safety reports to regulators within required timelines
The CRO's safety team is responsible for identifying potential safety signals early.
Two business models
CROs come in different shapes and sizes. The two most common business models are:
- Full service. CROs manage the entire trial end-to-end. This is ideal for sponsors who want a single point of accountability.
- Functional service provider (FSP). The sponsor hires CRO staff for specific functions like monitoring or data management, while keeping overall management in-house. The FSP model is popular with large pharmaceutical companies that want flexibility without losing internal control.
Quality and oversight
Sponsors cannot simply outsource and walk away. Regulations require sponsors to maintain oversight of every CRO they hire. This includes qualifying the CRO before the trial, conducting audits during the trial, and reviewing key performance metrics regularly.
Sponsor oversight involves several layers:
- Sponsor quality assurance teams audit the CRO's processes and systems
- Joint governance meetings track timelines, enrollment, and data quality
- The sponsor always retains ultimate responsibility for the trial
The FDA and EMA hold sponsors accountable for CRO performance. A sponsor cannot blame the CRO for a failed inspection.
Careers at CROs
Working at a CRO offers a unique career path in clinical research. CROs employ thousands of professionals including CRAs, data managers, biostatisticians, medical writers, safety specialists, project managers, and regulatory experts.
For many professionals, CROs offer exposure to a wider variety of therapies and trial phases compared to working at a single pharmaceutical company.
Why CROs matter
CROs bring enormous value to clinical development:
- Scalability. A sponsor can run 20 trials simultaneously without hiring 20 internal teams.
- Global reach. Staff in dozens of countries with knowledge of local regulations.
- Specialized expertise across therapeutic areas.
- Cost efficiency. They often reduce costs by spreading infrastructure across multiple clients.
Without CROs, most small and mid-size biotech companies could never bring a drug to market.
The bottom line
CROs, contract research organizations, are the companies that sponsors hire to run clinical trials. From clinical operations and data management to medical writing and safety monitoring, they cover the entire trial life cycle. They provide the scalability, global reach, and expertise that make modern drug development possible.
This article is based on the Clarity Clinical Solutions video "What Does a CRO Do? Contract Research Organizations Explained." Watch it here: What Does a CRO Do? Contract Research Organizations Explained
References
- Clarity Clinical Solutions — "What Does a CRO Do? Contract Research Organizations Explained" (video, source of the service descriptions and market statistics). https://www.youtube.com/watch?v=tMddFdjq9F8
- FDA — The Drug Development Process (context on the clinical trial life cycle CROs support). https://www.fda.gov/drugs/development-approval-process-drugs