Bayer and Loxo Oncology announced updated clinical data from the larotrectinib (LOXO-101) pediatric Phase I SCOUT trial (NCT02637687). Bayer and Loxo Oncology are jointly developing larotrectinib, an investigational compound being studied for the treatment of patients with cancers harboring tropomyosin receptor kinase (TRK) gene fusions, which are genetic alterations present across a wide range of tumors resulting in uncontrolled TRK signaling and tumor growth.
"The promising data presented today highlights the potential of larotrectinib in TRK fusion cancers for this patient population," said Carsten Brunn, president of Bayer Pharmaceuticals, Americas region. "Our strategic collaboration with Loxo Oncology delivers on our strong commitment to advance a diverse portfolio of cancer treatments on behalf of patients."
As of the July 17, 2017 data cut-off date, 24 pediatric patients were enrolled in the dose escalation portion of the Phase I trial, including 17 patients with TRK fusion cancers. TRK fusion patients carried primary diagnoses of infantile fibrosarcoma, thyroid cancer, and various soft tissue sarcomas. Among the 17 patients with TRK fusion cancers, 94 percent either remain on drug or received surgery with curative intent; four patients have been followed greater than one year and 12 have been followed greater than six months. The Overall Response Rate (ORR = PR + CR, Partial Response + Complete Response) in the TRK fusion patients was 93 percent as assessed by both the investigators and an independent review committee.
The larotrectinib adverse event profile is consistent with data previously presented publicly. The most common treatment-related adverse events at the Phase II dose included increased liver function tests, nausea, and neutropenia.
Larotrectinib (LOXO-101) is an investigational oral, selective investigational drug in clinical development for the treatment of patients across a wide range of cancers that harbor abnormalities involving the tropomyosin receptor kinases (TRKs). Growing research suggests that the NTRK genes, which encode for TRKs, can become abnormally fused to other genes, resulting in growth signals that can lead to cancer in many sites of the body.
Larotrectinib is an investigational drug that is being developed between Bayer and Loxo Oncology. Larotrectinib has been granted Breakthrough Therapy Designation, Rare Pediatric Disease Designation and Orphan Drug Designation (ODD) by the US Food and Drug Administration.
In November 2017, Bayer and Loxo Oncology entered into an exclusive global collaboration on the development and commercialization of larotrectinib and LOXO-195, a next-generation TRK inhibitor in clinical development. Bayer and Loxo Oncology will jointly develop the two products, larotrectinib and LOXO-195, and Bayer will lead ex-U.S. regulatory activities as well as worldwide commercial activities. In the U.S. Bayer and Loxo Oncology will co-promote the products. Loxo Oncology will remain responsible for the filing in the U.S.