What is the sponsor required to ensure regarding the trial according to ICH E6?

The requirement for sponsors according to ICH E6 is to ensure that the trial is conducted in compliance with the protocol and relevant regulatory requirements. This compliance is critical for maintaining the integrity of the clinical trial process, ensuring the safety and welfare of the participants, and producing valid and reliable data that can be used for decision-making. Adhering to the established protocol ensures that all procedures, treatments, and assessments are performed consistently and as designed, which is essential for the scientific validity of the trial's results.

While factors such as participant enjoyment, speed of market entry, and recruitment numbers are important in the broader context of clinical research, they do not supersede the necessity for compliance with established protocols and regulations. Ensuring ethical standards and regulatory compliance is the foundation upon which a successful and credible trial is built, thus making it the central focus for sponsors in the ICH framework.