Johnson & Johnson and Protagonist Therapeutics on Monday announced favourable top-line findings from two pivotal Phase III trials, ICONIC-LEAD and ICONIC-TOTAL, evaluating its oral first-in-class IL-23-targeting peptide, icotrokinra, in patients with moderate to severe plaque psoriasis aged 12 years and older. The partners said the drug, also known as JNJ-2113, achieved the main goals in both studies, demonstrating significant skin clearance.Highlighting the fact that most patients with moderate to severe disease aren't receiving advanced therapies despite qualifying for them, Liza O'Dowd, immunodermatology disease area lead at J&J Innovative Medicine, said “icotrokinra has the potential to offer once-daily oral therapy that could help address the needs and preferences of people living with plaque psoriasis.”Notable skin clearanceThe ICONIC-LEAD study enrolled 684 participants to receive once-daily icotrokinra or placebo, the co-primary endpoints being Psoriasis Area and Severity Index (PASI) 90 and Investigator's Global Assessment (IGA) 0/1 with a minimum 2-grade improvement. Results showed that at week 16, 64.7% of icotrokinra-treated patients achieved clear or almost clear skin, ie., IGA scores of 0/1, and 49.6% achieved a PASI 90 response, compared with 8.3% and 4.4% of placebo recipients, respectively. Efficacy improved further at week 24, with 74.1% of icotrokinra recipients achieving IGA scores of 0/1 and 64.9% reaching PASI 90.Meanwhile, the partners also noted that the ICONIC-TOTAL study investigating icotrokinra versus placebo in 311 patients with psoriasis affecting special areas like the scalp, genitals, and hands/feet — met its main goal of an IGA score of 0 or 1 with at least a 2-grade improvement at week 16, underscoring the IL-23 inhibitor’s potential for addressing hard-to-treat psoriasis cases. Moreover, safety data from both studies aligned with previous Phase II findings, with similar rates of adverse events between the icotrokinra and placebo groups. The companies plan to present detailed data at upcoming medical congresses and prepare submissions for regulatory approvals.Milestone payment triggeredAs part of the 2020 research collaboration between J&J and Protagonist, the latter is set to receive $165 million in milestone payments in the first quarter of next year, which includes $115 million for a completed Phase III study, $35 million for an NDA acceptance in psoriasis, and $15 million for a Phase III initiation in another indication. Protagonist is also eligible for up to $630 million in future milestones and 6% to 10% royalties on global net sales. Protagonist CEO Dinesh Patel said the latest findings further corroborate the company’s “innovative peptide technology platform and its effectiveness in creating highly differentiated new chemical entities.”The collaborative ICONIC clinical programme also includes ICONIC-ADVANCE 1 and 2, which will assess the safety and efficacy of icotrokinra in moderate to severe plaque psoriasis against placebo and Bristol Myers Squibb's Sotyktu (deucravacitinib). Additionally, the ICONIC-PsA programme evaluating icotrokinra for psoriatic arthritis will kick off early next year, while a Phase IIb ANTHEM study for ulcerative colitis is nearing completion. Top-line readouts for ICONIC-ADVANCE 1 and 2 and ANTHEM are expected in first half of next year.J&J’s current immunology portfolio includes IL-23 blocker Tremfya (guselkumab) and dual inhibitor of IL-23 and IL-12, Stelara (ustekinumab), both approved for a range of autoimmune conditions.