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Ritlecitinib

Generic Name
Ritlecitinib
Brand Names
Litfulo
Drug Type
Small Molecule
Chemical Formula
C15H19N5O
CAS Number
1792180-81-4
Unique Ingredient Identifier
2OYE00PC25
Background

Ritlecitinib (PF-06651600) is a highly selective inhibitor of Janus kinase 3 (JAK3) and the tyrosine kinase expressed in hepatocellular carcinoma (TEC) kinase family. In June 2023, it was approved by the FDA for the treatment of severe alopecia areata in adults and adolescents 12 years and older. It was further approved by the EMA in September 2023. Ritlecitinib is administered orally and is the first member of its class.

Ritlecitinib binds covalently to Cys-909 of JAK3, a site where other JAK isoforms have a serine residue. This makes ritlecitinib a highly selective and irreversible JAK3 inhibitor. Other kinases have a cysteine at a position equivalent to Cys-909 in JAK3, and several of them belong to the TEC kinase family. It has been suggested that the dual activity of ritlecitinib toward JAK3 and the TEC kinase family block cytokine signaling as well as the cytolytic activity of T cells, both implicated in the pathogenesis of alopecia areata.

Indication

Ritlecitinib is indicated for the treatment of severe alopecia areata in adults and adolescents 12 years and older. It is not recommended for use in combination with other JAK inhibitors, biologic immunomodulators, cyclosporine or other potent immunosuppressants.

Associated Conditions
Severe Alopecia Areata (AA)

Sun Pharma's Leqselvi Advances Toward Launch After Favorable US Court Ruling

• Sun Pharmaceutical Industries has gained significant legal leverage after a US Court of Appeals vacated a preliminary injunction against its alopecia areata treatment Leqselvi, potentially enabling commercialization despite ongoing litigation with Incyte. • Emkay Research projects Leqselvi could generate over $500 million in global sales by FY30, with initial US sales of $40 million expected in FY26, positioning it as a cornerstone specialty product with EBITDA margins exceeding 45%. • The brokerage firm has issued a "BUY" recommendation for Sun Pharma with a target price of Rs 2,400, representing a potential 45% upside from current levels, citing strong product pipeline and consistent execution on specialty drug launches.

U.S. Court Ruling Clears Path for Sun Pharma's Alopecia Drug Leqselvi Launch

• The U.S. Court of Appeals for the Federal Circuit has vacated a preliminary injunction against Sun Pharma, allowing the company to proceed with launching Leqselvi (deuruxolitinib) for alopecia areata in the American market. • Sun Pharma acquired Leqselvi through its $576 million Concert Pharma acquisition in 2023, positioning it as a key product in its specialty portfolio that recently surpassed $1 billion in annual sales. • The patent infringement litigation with Incyte Corporation continues, but Sun Pharma is no longer restricted from launching the drug, which analysts project could contribute $90 million to sales in FY26 and $125 million in FY27.

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Androgenetic Alopecia Pipeline Shows Promise with Over 100 Therapies in Development

• DelveInsight's latest report reveals a robust pipeline for androgenetic alopecia with 80+ companies developing 100+ therapeutic candidates across various clinical stages. • Key emerging treatments include KX-826 from Kintor Pharma and Clascoterone from Cassiopea, which could significantly expand options beyond the current FDA-approved minoxidil and finasteride. • Recent clinical trial results from companies like Veradermics, Chong Kun Dang, and Pelage Pharmaceuticals demonstrate increasing R&D investment in addressing this common condition affecting up to 50% of both men and women.

Pfizer's Litfulo Becomes First NHS-Approved Treatment for Severe Alopecia Areata

• NICE has recommended Pfizer's Litfulo (ritlecitinib) as the first NHS-approved drug therapy for severe alopecia areata, affecting approximately 14,000 people in the UK. • In the ALLEGRO trial, Litfulo demonstrated significant efficacy with 23% of treated patients achieving 80% hair coverage compared to 1.6% in the placebo group. • The once-daily oral medication is approved for patients aged 12 and over, marking a breakthrough in treating this autoimmune disorder that impacts roughly 2% of the population lifetime.

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Court Blocks Sun Pharma's Alopecia Drug Launch Following Incyte Patent Dispute

• A US district court in New Jersey has granted Incyte's preliminary injunction against Sun Pharma's Leqselvi (deuruxolitinib), halting its launch for alopecia areata treatment. • The legal dispute centers on Incyte's patent claims regarding deuterated forms of ruxolitinib, potentially impacting Sun Pharma's projected $200 million annual sales target. • Sun Pharma plans to appeal the decision, which affects their recently FDA-approved JAK 1/2 inhibitor for treating severe alopecia areata, a condition affecting over 700,000 Americans.

Aquestive Therapeutics Advances Anaphylm and Alopecia Treatment, Receives Analyst Boost

• Aquestive Therapeutics' Anaphylm sublingual film demonstrated rapid symptom resolution in an oral allergy syndrome challenge study, with a median time of 12 minutes. • The company plans to hold a pre-NDA meeting with the FDA in Q4 2024 and submit the NDA in Q1 2025, targeting a product launch in Q1 2026. • Aquestive is also developing AQST-108, a topical gel for alopecia areata, with a Phase 2 study expected to commence in the second half of 2025. • H.C. Wainwright raised the price target for Aquestive Therapeutics to $10, reflecting the potential of Anaphylm and AQST-108.
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