EARLY - PHASE CLINICAL RESEARCH

European Early-Phase

Clinical Trials

Supporting Phase I Clinical Studies in healthy volunteers
through a dedicated EU unit.

Based in the European Union, operating a dedicated Phase I unit aligned with applicable GCP and regulatory requirements.

36+

In-patient Beds for
Healthy Volunteers

100%

GCP-Aligned
Processes

20+

Years of
Experience

700+

Participants
Database

20+ Years

Of Experience in Early-Phase Clinical Research

Phase I Unit

Infrastructure organized across two dedicated units for controlled inpatient studies

EU Certified CRO

Slovenia, European Union regulatory environment

GCP Compliant

Conduct under international quality standards

Our Early-Phase Services

We provide focused early-phase clinical services for studies conducted in healthy volunteers, aligned with European regulatory requirements.

Phase I Clinical Trials

Early-phase clinical studies in healthy volunteers, including single and multiple ascending dose designs.

  • Single & Multiple Ascending Dose
  • Safety Monitoring
  • PK Sampling

First-in-Human (FIH)

Safety-driven first-in-human trials with intensive medical monitoring and real-time data review for early decision making.

  • Sentinel Dosing
  • Real-time Safety Review
  • Dose Escalation

BA/BE Studies

Bioavailability and bioequivalence trials for generics, reformulations, and fixed-dose combinations in line with EMA guidance.

  • Crossover Designs
  • Fed/Fasted Studies
  • Regulatory Submission

PK/PD Studies

Pharmacokinetic and pilot studies supporting early decision-making and development planning.

  • PK / PD assessment
  • Early development support
  • Modeling Support

Pilot Studies

Hybrid early-phase designs to accelerate proof-of-concept and support regulatory and development decisions.

  • Early Efficacy Evaluations
  • Optimal Dosing Regimens
  • Optimal Dosing Regimens

Data Management & Statistics

Structured data capture, cleaning, and biostatistical analysis leading to clear, regulatory-ready clinical study reports.

  • FDA-Approved EDC with Full Audit Trail
  • GXP-Compliant Validation
  • Expert Statistical Analysis
Early-phase clinical research

Regulatory &

Study StartUp

Regulatory and study startup activities are coordinated in parallel with Phase I trial preparation to support timely study initiation within EU regulatory frameworks.

Protocol Development & Medical Writing

Support for protocol development and medical writing aligned with EU and ICH-GCP requirements.

  • Study Protocol Development
  • Protocol Optimization
  • Medical Writing Support

Ethics & Regulatory  Submissions

Coordination of ethics committee and regulatory authority submissions in accordance with EU requirements.

  • CTIS Submission Coordination
  • Regulatory Interaction Support
  • Ethics and Authority Submission Support

Quality & Regulatory Support

Quality system support appropriate for early-phase clinical studies conducted within the European Union.

  • Inspection Readiness Support
  • ISOP framework
  • Regulatory compliance support
Early-phase clinical research

Clinical Operations &

Study Management

Operational oversight and site management supporting the day-to-day conduct of early-phase clinical studies.

Study Coordination

Central study coordination ensuring aligned timelines, clear responsibilities, and consistent execution across all study activities.

  • Study planning and scheduling
  • Cross-functional coordination
  • Oversight of study milestones

Site & Participant Operations

Day-to-day site operations supporting participant screening, study conduct, and inpatient study activities in accordance with the protocol.

  • Participant screening and scheduling
  • Inpatient study conduct
  • On-site operational support

Sponsor Communication & Reporting

Ongoing sponsor communication and reporting to ensure transparency, timely updates, and alignment throughout study conduct.

  • Regular study status updates
  • Issue tracking and resolution
  • Study close-out coordination
Early-phase clinical research

Why Sponsors Choose Us

CRS combines the experience of an established European research center with the direct collaboration and responsiveness of a dedicated early-phase clinical unit.

We support early-phase clinical studies in healthy volunteers through a structured, proportionate approach to study design, regulatory coordination, and clinical operations.

Our services are tailored to early development programs where clarity, accessibility, and reliable execution are essential. An integrated operational model, supported by established quality processes and secure in-house systems, enables consistent study conduct without unnecessary complexity.

CRS has a demonstrated track record in Phase I and bioequivalence studies conducted within the European Union.

Learn more about us
  • 20+ years of experience in Phase I-IV clinical development
  • Trusted partner for biotech and specialty pharma sponsors
  • Collaboration models aligned with early development needs
  • Established volunteer database and efficient recruitment processes ensure timely study execution.
  • Dedicated Phase I unit configured across two units for controlled inpatient studies

Planning a Phase I, BA/BE, or PK/PD study in Europe?

For study participants

Participate in Clinical Studies

CRS regularly conducts supervised clinical studies that contribute to the development of new medicines. Volunteers receive medical examinations and appropriate compensation in a safe, controlled environment. By becoming a study volunteer at CRS, you play an important role in advancing medical research and helping develop new and better treatments. All studies are conducted under strict ethical and safety standards, with your health and well-being as our top priority.

> 24 h Medical supervision by experienced Investigators
> Ethics Committee & Regulatory Approval for all studies
> Clear and transparent information & Informed Consent
> Compensation for your time & commitment.


Become a Volunteer