A research site was invited to participate in an investigational drug study.

Therisk-benefit ratiois a core responsibility of the IRB/IEC.

21 CFR 56.111(a)(2):“Risks to subjects are reasonable in relation to anticipated benefits, if any, to subjects, and the importance of the knowledge that may reasonably be expected to result.”

ICH E6(R2) 3.1.2:IRB/IEC must safeguard rights, safety, and well-being of subjects, with special attention to risk-benefit evaluation.

Investigators (A) provide medical judgment but do not formally approve the risk-benefit balance. Sponsors (D) design studies but must submit to IRB for independent review. Legal counsel (C) is not part of the scientific/ethical evaluation.

Thus,IRB/IEC is directly responsible for approving the risk-benefit ratio.