[11C]PBR-28 Drug Asset Due Diligence Report 2026: Clinical, IP, Market, Deals, and Go/No-Go
This [11C]PBR-28 Drug Asset Due Diligence Report was built with PatSnap Life Sciences MCP workflows. Drug & Asset MCP establishes identity, ownership and stage; Clinical Trials MCP checks design, endpoints and readouts; Company & Deal Intelligence MCP reconstructs transaction precedent. Explore the MCP servers used in this report.
Decision date: 11 September 2026. Currency fields are presented in US$ millions as returned by the deal dataset. This is a screening memorandum, not legal, medical, patent or investment advice.
Executive recommendation: CONDITIONAL GO
Decision memo
Advance with milestone-based economics while efficacy durability, safety differentiation, patent scope, and market positioning are validated.
The central underwriting question is whether [11C]PBR-28 can convert its Small molecule drug, Diagnostic radiopharmaceuticals profile and TSPO biology into clinically meaningful differentiation while preserving an investable safety, IP and commercial position.
1. Asset identity and development status
| Asset | [11C]PBR-28 (query alias: [11C]PBR-28) |
|---|---|
| Modality / target | Small molecule drug, Diagnostic radiopharmaceuticals; TSPO; TSPO inhibitors, PET imaging |
| Highest global status | Phase 1/2 |
| Originator | The Trustees of Columbia University in The City of New York |
| Active developers | Yale University, The Brigham & Women's Hospital, Inc., The University of Texas Health Science Center at Houston |
The MCP disease footprint includes AIDS Dementia Complex, Alzheimer Disease, Multiple Sclerosis. The highest-phase flag is a useful orientation point, but the licensing case depends on indication-level evidence and rights, not the global label alone.
2. Clinical program: design and endpoint audit
| Registry | Phase | Status | Enrollment | Lead primary endpoint |
|---|---|---|---|---|
| ChiCTR2300069691 | Phase 2 | Not yet recruiting | 10 | Primary endpoint not disclosed in English source |
| NCT05586581 | Phase 1/2 | Recruiting | 70 | Primary endpoint not disclosed in English source |
| NCT05205291 | Not Applicable | Recruiting | 30 | Primary endpoint not disclosed in English source |
The trial set should be diligenced for randomization, comparator relevance, endpoint hierarchy, analysis population, multiplicity, geographic mix and readout timing. For early-stage studies, safety and dose selection can be as decision-critical as response rate.
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3. Clinical readouts: what is known
PET Imaging of Translocator Protein in Subjects With Traumatic Brain Injury
Phase 1/2; n=52; evaluation: Not stated in English source. Reported fields: Receptor Binding (Vt)(Mean) = 2.53 mL/cm^3 ; Receptor Binding (Vt)(Mean) = 2.21 mL/cm^3
Noninvasive Assessment of Abdominal Aortic Aneurysm (AAA) Wall Structural Integrity and Inflammation as Predictors of Expansion and/or Rupture
Phase 4; n=2; evaluation: Not stated in English source. Reported fields: Other (Not Including Serious) Adverse Events = 0 Pts ; Other (Not Including Serious) Adverse Events = 0 Pts
11C-PBR28 binding to translocator protein increases with progression of Alzheimer's disease
Not Applicable; n=not disclosed; evaluation: Not stated in English source. Reported fields: TSPO binding = 6.3 % ; TSPO binding = 1 %
These fields are structured evidence signals, not a substitute for statistical review. The next diligence pass should reconcile denominators, confidence intervals, follow-up, censoring, dose cohorts and treatment-emergent toxicity against the original abstract, registry and protocol.
4. Market and competitive position
[11C]PBR-28 addresses AIDS Dementia Complex, Alzheimer Disease, Multiple Sclerosis. Commercial attractiveness rests on addressable patients, treatment-line placement, duration, administration burden, pricing and displacement of entrenched standards. The modality—Small molecule drug, Diagnostic radiopharmaceuticals—must demonstrate a benefit large enough to offset class-specific safety and operational costs.
The MCP screen returned 1 matched transaction record(s) under the scope “target-level comparable: TSPO.” Partner activity is a market-validation signal, but it does not establish net present value.
5. Transaction precedent and economics
Transaction-scope note: No direct asset-specific transaction was returned. The table below shows target-level comparable: TSPO records as comparable precedents only.
| Date | Transaction | Phase at deal | Disclosed economics |
|---|---|---|---|
| 2014-01-01 | BELLUS Health entered into a development and license agreement with AMO Pharma | Phase 1 | Financial terms not disclosed |
Headline values are not directly comparable. Diligence should normalize upfront cash, equity, development and sales milestones, tiered royalties, opt-in mechanics, cost sharing, change-of-control clauses and geography.
6. IP and freedom-to-operate screen
The milestone feed surfaced a patent-application signal described as “Methods to predict binding affinity of TSPO imaging agents to tspo”. The milestone feed surfaced a patent-application signal described as “Aryloxyanilide derivatives”.
The claim chart should separately test composition or sequence coverage, formulation and dosing, indication and biomarker claims, combinations, manufacturing know-how, prosecution history, term extensions and third-party blocking rights.
7. Principal risks and diligence gates
- Therapeutic index and off-target toxicity
- Resistance biology and biomarker-defined patient selection
- Differentiation from established and emerging standards
Cross-functional diligence should also test CMC comparability, supply chain, pharmacovigilance, regulatory correspondence, data integrity, investigator concentration, partner obligations and change-of-control restrictions.
8. Final go/no-go memorandum
CONDITIONAL GO
Advance with milestone-based economics while efficacy durability, safety differentiation, patent scope, and market positioning are validated.
Required pre-signing gates: reproduce key efficacy analyses; complete an indication-specific safety review; run a full patent-family and freedom-to-operate search; model risk-adjusted economics by territory; and reconcile all rights, sublicenses and encumbrances.
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Data provenance: PatSnap Drug & Asset MCP, Clinical Trials MCP, and Company & Deal Intelligence MCP; accessed 2026-09-11. Counts and status fields may change as source records update.
