Vendor and Depot Management: The Sponsor's Checklist for Global Clinical Trials

In a global trial, you don't run your own supply chain. You run a network of other people's — a CMO here, a packaging vendor there, a central depot, three regional depots, a courier network, and sixty sites. Your drug spends almost its entire life in someone else's building or someone else's truck.

That's not a problem. It's the standard operating model, and it works. But it does mean that a sponsor's real job isn't execution — it's oversight. And oversight fails in predictable ways: unclear ownership at handoffs, depots selected on price alone, vendor performance nobody measures until something breaks, and a quality agreement that nobody has read since it was signed.

This is the checklist we use with sponsors to keep that network under control.

Why depots matter more than sponsors expect

A depot is not a warehouse. It's the node that determines whether a site in São Paulo or Seoul gets resupplied in four days or four weeks. Depot strategy quietly decides three things at once: how fast you can respond to a site running low, how much buffer stock you have to carry, and how exposed you are to customs and import delays.

Position supply badly and you end up in the worst of both worlds — stock sitting in the wrong region while sites elsewhere run short, and none of it easily redeployable across borders. Position it well and the same total quantity of drug covers far more risk.

Checklist 1: Selecting a depot

Work through these before you commit, not after.

• Regulatory licensing and GDP compliance. Is the depot properly licensed to handle investigational product in that country, and does it operate to Good Distribution Practice?
• Temperature capability — actual, not claimed. Confirm the storage ranges they genuinely maintain (ambient, 2–8°C, frozen, ultra-cold) and how they're monitored and alarmed, including out of hours.
• Import and export competence. Do they hold the right licenses, and do they have real experience clearing IMP into that market? Customs know-how is worth more than shelf space.
• Proximity and lead time to your actual sites. Measure in delivery days to your real site list, not in map distance.
• Systems integration. Can they exchange inventory and shipment data with your IRT and your systems in a usable way, or will it be manual reconciliation by email?
• Capacity and scalability. Can they absorb your peak volumes and grow if enrollment accelerates?
• Quality history. Ask about their inspection history, deviation rates, and how they handled their last significant excursion.
• Business continuity. What happens in a power failure, a strike, or a regional disruption? A depot without a continuity plan is a single point of failure.

Checklist 2: Structuring the vendor relationship

Selection is the easy part. The relationship is where value is won or lost.

• A quality agreement that's specific. Generic templates create gaps. Define who does what, to what standard, with what documentation — especially for excursions, deviations, and returns.
• Defined KPIs, agreed up front. On-time-in-full delivery, order accuracy, excursion rate, inventory accuracy, and responsiveness. Metrics agreed after a problem are always disputed.
• A named human on both sides. Escalation paths that route to a shared inbox fail. Name the people.
• Documented handoff responsibilities. Handoffs — CMO to depot, depot to courier, courier to site — are where most failures originate, because that's where ownership is ambiguous. Write down who owns the product at every point.
• Data and reporting cadence. Agree what they send you, in what format, how often. Oversight without data is just trust.
• Change control. How do they notify you of process, personnel, or facility changes that could affect your trial?

Checklist 3: Ongoing oversight

The commonest failure mode isn't a bad vendor — it's a good vendor nobody was watching.

• Review performance on a fixed cadence. Monthly or quarterly, against the KPIs you agreed. Look for drift, not just breaches: a vendor sliding from 98% to 92% on-time is telling you something before it becomes a stockout.
• Audit risk-based, not uniformly. Audit the depots handling your most critical, most fragile, or most complex supply more often than the ones handling low-risk ambient stock.
• Reconcile inventory regularly. Discrepancies between depot records and your system are early evidence of a process problem.
• Track excursions by vendor and lane. Patterns matter far more than individual events.
• Keep documentation inspection-ready continuously. Vendor oversight evidence is something inspectors ask for directly — your qualification records, audit reports, and performance reviews should be current, not reconstructed.

The oversight trap: outsourcing responsibility

Here's the point that catches sponsors out. You can outsource the activity to a vendor. You cannot outsource the accountability. Regulators hold the sponsor responsible for the conduct of the trial, including the supply chain, regardless of how many partners are involved.

That's why "our CRO handles that" is never an adequate answer in an inspection. Delegation is fine and normal; the oversight of that delegation is yours, and it needs to be documented.