B. The Data Safety Monitoring Board (DSMB)
C. The regulatory authority
D. No notification is required
Explanation:
The Investigator’s Brochure (IB) is updated by the sponsor to reflect new scientific or clinical information.
ICH E6(R2) 7.3: “The sponsor should revise the IB as soon as new, significant information becomes available.”
ICH E6(R2) 4.1.5: Requires the investigator to ensure staff are informed, but there is no requirement to notify IRB/IEC unless subject safety, rights, or risk profile is affected.
Since this update contained no changes related to subject safety, the investigator is not obligated to notify IRB/IEC, DSMB, or regulators. The updated IB must simply be filed in the regulatory binder and implemented at the site.
Thus, the correct answer is D (No notification is required).
Reference: ICH E6(R2), §7.3 (Updating the Investigator’s Brochure).
ICH E6(R2), §4.1.5 (Investigator responsibilities for informing staff).