On June 3, 2024 IDEAYA Biosciences, Inc. (the "Company") reported clinical data from the ongoing investigator-sponsored Phase 2 trial of darovasertib, the Company’s oral, small molecular inhibitor of protein kinase C (or PKC), as neoadjuvant/adjuvant treatment in uveal melanoma (or UM) (Press release, Ideaya Biosciences, JUN 3, 2024, View Source [SID1234644013]). The clinical data from the trial were included in an oral presentation at the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) 2024 Annual Meeting by Anthony Joshua, MBBS, PhD, FRACP, Head Department of Medical Oncology, Kinghorn Cancer Centre, St. Vincent’s Hospital in Sydney, and the lead principal investigator of the Phase 2 study. The Company also announced preliminary clinical data from its Phase 2 trial of darovasertib for neoadjuvant UM.

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ASCO Clinical Data from Investigator-Sponsored Phase 2 Trial:

Fifteen patients planned for enucleation with localized UM were treated with darovasertib 300mg twice daily. An initial safety cohort of three patients were treated for one month, and the remaining 12 patients were treated in an expansion cohort for up to six months as neoadjuvant treatment prior to their primary intervention (enucleation, plaque brachytherapy or external beam radiotherapy (EBRT)) across three Australian centers.

As of the database lock on May 14, 2024, 13 patients had completed neoadjuvant treatment, 11 patients received adjuvant darovasertib after primary treatment of their UM, with five patients completing the planned six months of therapy. As of May 14, 2024, 75% (9 out of 12 enucleation patients) had confirmed Eye Saved (i.e., converted to plaque brachytherapy or EBRT) and approximately 67% (8 out of 12 enucleation patients) observed greater than 30% tumor shrinkage (maximum volume change) after 6 months. Median tumor shrinkage (maximum volume change) in 12 enucleation patients was approximately 47% after 6 months.

The darovasertib monotherapy neoadjuvant treatment had a manageable adverse event (AE) profile with no drug-related serious adverse events observed. Drug-related AEs were predominantly Grade 1 or Grade 2 and 20% of patients reported at least one drug-related Grade 3 adverse event.

Phase 2 Company-Sponsored Trial Data:

As of May 24, 2024 cut-off date, the Phase 2 company-sponsored darovasertib neoadjuvant UM trial has activated over 14 sites globally and enrolled over 40 patients. As of the cut-off date, 8 patients (6 enucleation and 2 plaque eligible) have been on darovasertib treatment for 4-months or more and observed median tumor shrinkage (maximum height/base/volume change) of approximately 40%/25%/72% and the majority of the 6 enucleation patients had reported Eye Saved (i.e., converted to plaque brachytherapy or EBRT eligible).

In the 8 patients with 4-months or more of darovasertib treatment as of May 24, 2024, darovasertib had a manageable AE profile with no drug-related serious adverse events observed, and drug-related AEs were predominantly Grade 1 or Grade 2 and approximately 13% of patients reported at least one drug-related Grade 3 AE.