Several CROs are well-known for their contributions to cancer research: 1. IQVIA: Known for its comprehensive data analytics and clinical trial management services. 2. PAREXEL: Specializes in regulatory consulting and clinical research. 3. Covance: Offers end-to-end drug development services, including preclinical and clinical trials. 4. PRA Health Sciences: Focuses on providing innovative solutions for complex trials. 5. Syneos Health: Combines clinical and commercial services to accelerate cancer drug development.