Combretastatin A1 Phosphate Drug Asset Due Diligence Report 2026: Clinical, IP, Market, Deals, and Go/No-Go
This Combretastatin A1 Phosphate 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: 16 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 Combretastatin A1 Phosphate can convert its Small molecule drug profile and Tubulin biology into clinically meaningful differentiation while preserving an investable safety, IP and commercial position.
1. Asset identity and development status
| Asset | Combretastatin A1 Phosphate (query alias: Combretastatin A1 Phosphate) |
|---|---|
| Modality / target | Small molecule drug; Tubulin; Tubulin modulators |
| Highest global status | Phase 2 |
| Originator | Oncotelic Therapeutics, Inc. |
| Active developers | Oncotelic Therapeutics, Inc. |
The MCP disease footprint includes Hepatocellular Carcinoma. 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 |
|---|---|---|---|---|
| NCT02576301 | Phase 1/2 | Unknown status | 105 | Primary endpoint not disclosed in English source |
| NCT01085656 | Phase 1 | Terminated | 18 | Primary endpoint not disclosed in English source |
| NCT00977210 | Phase 1 | Completed | 40 | 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
Mateon Therapeutics Team Publishes a New Peer-Reviewed Oncology Article on the Positive Clinical Study Results for Its Lead Anti-Leukemia Drug Combretastatin A1 Plus Cytarabine in Adult Patients With Relapsed Acute Myeloid Leukemia
Phase 1; n=26; evaluation: Positive. Reported fields: CR/CRi = 15.4 %
A Phase 1B Clinical Study of Combretastatin A1 Diphosphate (OXi4503) and Cytarabine (ARA-C) in Combination (OXA) for Patients with Relapsed or Refractory Acute Myeloid Leukemia
Phase 1; n=29; evaluation: Positive. Reported fields: MTD = 9.76 mg/m2 ombination with 1 g/m2 ARA-C
Mateon Therapeutics Announces Positive Clinical Study Results for Its Lead Anti-Leukemia Drug Combretastatin A1 Plus Cytarabine in Adult Patients with Relapsed Acute Myeloid Leukemia
Phase 1/2; n=26; evaluation: Positive. Reported fields: MTD = 8.5 mg/m^2
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
Combretastatin A1 Phosphate addresses Hepatocellular Carcinoma. Commercial attractiveness rests on addressable patients, treatment-line placement, duration, administration burden, pricing and displacement of entrenched standards. The modality—Small molecule drug—must demonstrate a benefit large enough to offset class-specific safety and operational costs.
The MCP screen returned 209 matched transaction record(s) under the scope “target-level comparable: Tubulin.” 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: Tubulin records as comparable precedents only.
| Date | Transaction | Phase at deal | Disclosed economics |
|---|---|---|---|
| 2026-09-03 | Pfizer offloads scrapped Seagen ADC to Medicus Pharma in up to $1B+ deal | Discontinued | US$12.0M upfront; US$1,015.0M milestones |
| 2026-08-12 | ArriVent BioPharma, Inc. Enters Into Exclusive Licensing Agreement With Shanghai Allist Pharmaceuticals Co., Ltd. For ARR-002 In Greater China | Phase 1 | US$80.6M stated total |
| 2026-06-03 | Lupin and Natco Receive Approval from U.S. FDA for Eribulin Mesylate Injection | Approved | 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 “Use of VDAS to enhance immunomodulating therapies against tumors”. The milestone feed surfaced a patent-application signal described as “Use of VDAS to enhance immunomodulating therapies against tumors”. The milestone feed surfaced a patent-application signal described as “Combination therapies targeting tumor-associated stroma or tumor cells”.
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 2026-09-16. Counts and status fields may change as source records update.
