The investigator should be thoroughly familiar with the appropriate use of the investigational products as described in which sources?

• A. The protocol only
• B. Product labeling alone
• C. The protocol, the current Investigator's Brochure, the product information, and other information sources provided by the sponsor
• D. The sponsor's internal notes

Answer: (C)

Understanding how to use an investigational product correctly requires consulting all the official, current references that describe its use. The protocol sets the study design, dosing schedule, route of administration, and eligibility, so the investigator must follow it exactly. The Investigator's Brochure provides comprehensive information about the product's pharmacology, safety data, handling, storage, and administration precautions, which are essential for safe and compliant use. Product labeling offers the regulatory-approved instructions and any labeling-specific restrictions that must be observed in practice. Sponsor-provided information sources may include updated safety notices, amendments to the protocol or IB, and site-specific guidance reflecting the most current information. Using these sources together ensures the investigator uses the product correctly, safely, and in line with regulatory requirements. Relying on only the protocol or only the labeling omits important details, and sponsor internal notes are not an appropriate standalone reference.