Pathology Associates

Pathology Associates is a specialized contract research organization (CRO) that provides toxicologic pathology services to the pharmaceutical, biotechnology, and chemical industries. Originally established as Pathology Associates International (PAI), the company became a cornerstone of Charles River Laboratories' pathology division following its acquisition in 2001. The firm offers a comprehensive suite of services including histopathology, immunohistochemistry, morphometry, and electron microscopy, primarily focused on non-clinical safety studies. With a strong reputation for regulatory expertise, Pathology Associates supports clients in navigating the pathological requirements of IND and NDA submissions. The company operates out of several key facilities, most notably in Frederick, Maryland, and continues to be a leader in the field of veterinary and toxicologic pathology. Their expertise is particularly critical for interpreting complex tissue responses in animal models during drug development.