Company: TVRD
Filing Date: 2025-05-30
Form Type: S-1
Source: 0001104659-25-054853
Chunk: 166

Company: Tvardi Therapeutics, Inc.
Filing Date: 2025-05-30
Form: S-1
Chunk 166
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 and well-established signaling regulators of fibrosis, such as IL-6 and TGF-β, have been shown to induce pY-STAT3-dependent fibrotic conditions. pY-STAT3 is known to act both independently and in conjunction with other signaling networks that contribute to fibrosis. pY-STAT3 drives the development and progression of fibrosis through clotting and coagulation, inflammatory cell migration and fibroblast proliferation, ultimately leading to ECM deposition. STAT3’s role as the central mediator in the pathogenesis of fibrosis has been validated in third-party preclinical haploinsufficiency models, where one of two alleles of STAT3 were knocked out. In these preclinical studies, haploinsufficient STAT3 mice did not develop lung fibrosis despite injury, whereas the knockout of IL-6 or TGF-β receptor (TGF-βR), still resulted in fibrosis. These preclinical studies suggest that targeting individual signaling pathways is insufficient to block the development of fibrosis, however inhibiting STAT3 activation can potentially prevent the initiation of fibrosis.

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STAT3 Activation is a Central Catalyst in the Fibrotic Cascade</div>

#### Our Approach to Targeting STAT3
STAT3, like many transcription factors, has historically been deemed undruggable due largely to its intracellular location and the failure to identify residues within its Src-homology (“SH”) 2 domain critical for its activation. Though STAT3 has been a recognized and interrogated target for drug development, there is yet to be an FDA-approved STAT3-targeting therapeutic. Prior approaches to target the STAT3 signaling pathway have largely been indirect, focused on upstream signaling mechanisms, including growth factors and cytokines, such as IL-6 and TGF-β, their receptors, or receptor-intrinsic or receptor-associated tyrosine kinases. Due to the adaptive nature of most signaling cascades, indirect approaches have led to off target effects or acquired resistance. As a result, we believe that direct targeting of STAT3 is the more robust approach to impacting downstream mediators of fibrosis within the STAT3 signaling pathway. Previous attempts to directly inhibit STAT3 have often demonstrated lack of selectivity, poor PK and/or poor absorption. In addition, some molecules identified to date are not reversible competitive inhibitors of STAT3; rather, their binding to STAT3 leads to its instability and degradation, which reduces non-canonical STAT3 functions within the mitochondria, resulting in off-target impacts and toxicities such