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About

At PSI, we believe clinical research demands more than expertise - it requires partnership built on trust and consistent delivery. Founded in 1995, we have grown into a global team of over 3,200 professionals across 58 countries, united by a commitment to running pivotal Phase II and III trials on time, every time. Our strength lies in predictable patient enrollment across oncology, hematology, and multiple therapeutic areas, backed by data-driven feasibility studies and personalized site support that maintains a 95% repeat and referral rate.

We are proud to be the only fully independent and privately owned mid-sized CRO, organically grown since our founding. Our mission is simple: be the best CRO in the world as measured by our employees, clients, sites, and vendors. This focus on people first has earned us recognition through seven consecutive years of CRO Leadership Awards. We thrive on international collaboration, rich cultural diversity, and developed quality standards that ensure every trial succeeds. When you join PSI, you are not just advancing clinical research - you are part of a team that genuinely cares.

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