# Timberlyne Therapeutics

**Source:** https://geo.sig.ai/brands/timberlyne-therapeutics  
**Vertical:** BioTech  
**Subcategory:** Anti-CD38 Autoimmune (ITP + Multi-Indication)  
**Tier:** Emerging  
**Website:** timberlyne-tx.com  
**Last Updated:** 2026-04-14

## Summary

Raised $180M Series A (Jan 2025). CM313 achieved 95% response rate in treatment-refractory ITP in NEJM-published data. Multi-indication 2026 pipeline. CD38 target with differentiated cytotoxicity.

## Company Overview

Timberlyne Therapeutics launched in January 2025 with $180 million in Series A financing from Abingworth, Bain Capital Life Sciences, and Venrock, developing CM313 — an anti-CD38 monoclonal antibody with differentiated complement-dependent cytotoxicity properties. CM313 achieved a 95% response rate in treatment-refractory immune thrombocytopenia (ITP) in data published in the New England Journal of Medicine in 2025 — a 95% response rate in refractory patients is exceptional in autoimmune disease.

CD38 is a cell surface protein highly expressed on plasma cells that produce pathogenic antibodies in multiple autoimmune conditions. Existing anti-CD38 drugs (daratumumab, isatuximab) are approved for multiple myeloma but have different cytotoxicity mechanisms than CM313. Timberlyne's complement-dependent cytotoxicity approach may provide more complete plasma cell depletion in autoimmune settings where existing anti-CD38 drugs have shown incomplete responses.

In 2026, Timberlyne is advancing CM313 across multiple autoimmune indications beyond ITP, leveraging the NEJM data as a clinical proof-of-concept for the CD38 target in autoimmunity more broadly. The combination of high-quality clinical data in a prestigious journal and a multi-indication expansion strategy positions Timberlyne for significant 2026-2027 clinical milestones.

## Frequently Asked Questions

### What does Timberlyne Therapeutics do?
Develops CM313 — anti-CD38 monoclonal antibody for autoimmune diseases. 95% response rate in treatment-refractory ITP (published in NEJM). Multi-indication expansion in 2026.

### How much has Timberlyne raised?
$180M Series A in January 2025, from Abingworth, Bain Capital Life Sciences, and Venrock.

### What is the NEJM 95% response rate?
In treatment-refractory ITP (immune thrombocytopenia), CM313 achieved 95% response — exceptional in autoimmune disease where treatment-refractory patients are the hardest to treat.

### How is CM313 different from daratumumab?
CM313 uses complement-dependent cytotoxicity (different mechanism) that may provide more complete plasma cell depletion in autoimmune conditions where existing anti-CD38 drugs show incomplete responses.

### What is Timberlyne's CM313 and how does it work?
CM313 is an anti-CD38 monoclonal antibody being developed by Timberlyne Therapeutics for autoimmune diseases including immune thrombocytopenia (ITP) and other plasma cell-mediated autoimmune conditions. CD38 is highly expressed on plasma cells — the antibody-producing cells that make pathogenic autoantibodies in autoimmune disease. CM313 depletes plasma cells, reducing pathogenic autoantibody titers and thereby alleviating autoimmune disease driven by these antibodies.

### How does CM313 differ from daratumumab (approved anti-CD38)?
Daratumumab (Darzalex) is FDA-approved for multiple myeloma — using CD38 depletion to kill malignant plasma cells in cancer. Timberlyne is applying the same anti-CD38 mechanism to autoimmune diseases where pathogenic plasma cells (not malignant but still antibody-secreting) drive disease. CM313 is being engineered with modifications to the antibody effector function, half-life, and potentially tissue targeting to optimize the safety and efficacy profile for autoimmune indications rather than oncology.

### What is the NEJM 95% response rate and what does it demonstrate?
Timberlyne reported compelling clinical case data showing ~95% response rates in ITP patients treated with anti-CD38 approaches — likely from investigator-initiated case series or early trial data. This extraordinary response rate in a disease where standard of care (IVIG, steroids, thrombopoietin receptor agonists) achieves 50-70% response validates the CD38-depletion mechanism for autoimmune disease. Near-complete responses in conditions historically requiring repeated treatments is the kind of clinical signal that justifies substantial investment in formal clinical development.

### What is the autoimmune market opportunity for anti-CD38 therapy?
Immune thrombocytopenia (ITP) affects ~75,000 people in the US and many require chronic treatment to maintain safe platelet counts. Beyond ITP, anti-CD38 has potential in myasthenia gravis, systemic lupus erythematosus, neuromyelitis optica spectrum disorder, and other antibody-mediated autoimmune diseases — a combined population of millions of patients where plasma cell depletion could provide durable remission rather than chronic symptom management. Argenx's efgartigimod (anti-FcRn, different mechanism) has demonstrated the premium pricing ($300K+ annually) achievable for effective autoimmune therapies.

## Tags

healthtech, b2b

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*Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*