Direct comparison
Sponsor vs. CRO: Roles & Responsibility
Sponsor holds regulatory responsibility for a trial; a CRO is a contracted vendor. Delegation must be in writing (21 CFR 312.52, ICH E6(R2) 5.2).
Side-by-side comparison
| Dimension | Sponsor | CRO |
|---|---|---|
| What it is | The entity that initiates, holds regulatory responsibility for, and typically funds the trial | A third-party vendor contracted by the sponsor to perform some or all trial-related functions |
| Typical entity types | Pharma/biotech company, academic institution, or federal agency | Commercial CRO, academic CRO, or specialized functional service provider (FSP) |
| ICH E6(R2) definition | Individual, company, institution, or organization taking responsibility for initiation, management, and/or financing of a trial | Person or organization contracted by the sponsor to perform one or more sponsor trial-related duties and functions |
| Holds the IND/IDE | Yes (or acts as responsible party in non-IND research) | No — performs work under the sponsor’s authority |
| Ultimate regulatory responsibility | Retained by default under 21 CFR 312.52 and ICH E6(R2) 5.2, even when functions are delegated | Only for the specific obligations explicitly transferred in writing |
| Requires a written transfer to delegate | Yes — must describe transferred obligations in writing (312.52) | Assumes only what the written agreement specifically assigns |
| Financial relationship | Pays the CRO for contracted services | Is paid by the sponsor |
| Number per trial | One (though co-sponsorship arrangements exist) | Zero, one, or several — sponsors may use multiple CROs/FSPs for different functions |
| Subject to GCP inspection | Yes | Yes, for the obligations it has assumed |
Common questions
FAQ
Can a sponsor delegate all of its trial-related responsibilities to a CRO?+
A sponsor can transfer performance of essentially all its regulatory obligations to a CRO under 21 CFR 312.52, provided the transfer is described in writing. But GCP frameworks such as ICH E6(R2) hold that ultimate responsibility for trial data quality and integrity remains with the sponsor.
Does hiring a CRO shift legal or regulatory liability away from the sponsor?+
Not automatically. Liability follows what was actually transferred in writing. Any obligation not specifically assigned to the CRO is treated as retained by the sponsor.
Is a sponsor-investigator the same as a sponsor?+
A sponsor-investigator (21 CFR 312.3) is a distinct category where one individual both initiates the trial and personally conducts it, carrying both sponsor and investigator obligations at once — it does not describe a CRO relationship.
Is a CRO required to follow Good Clinical Practice?+
Yes. Any obligation a CRO assumes from a sponsor is subject to the same GCP and regulatory requirements that would apply if the sponsor performed that function directly.
Going deeper
