Rare diseases
With Phase 3 data showing what analysts called a “potentially best-in-class profile,” Arrowhead Pharmaceuticals plans to submit for FDA approval of plozasiran by the end of the year—hoping to follow to market Ionis Pharmaceuticals’ Tryngolza, which got the regulator’s nod in severe hypertriglyceridemia last month.
A Congressional advisory panel recommends the U.S. government put supportive policies in place for rare disease drug development, such as a finalized platform designation from the FDA and the allowance of novel trial designs for small patient populations.
Agios Pharmaceuticals’ sickle cell disease candidate didn’t prove any better than Novo Nordisk’s investigational PK activator or the biopharma’s own asset that is currently under FDA review for the indication.
Spero Therapeutics is putting over $1 billion on the line in exchange for rights to develop SP001, an anti-CD40L antibody, for IgG4-related disease. A Phase 2 study is planned for the second quarter of 2027.
The trials, which were testing the tyrosine kinase inhibitor masitinib, had previously been paused. AB Science’s decision not to resume them was a matter of prioritization, not safety, the biotech said.
Regulators on both sides of the Atlantic are pushing for the withdrawal of the rare disease treatment that accounted for just 1% of Amgen’s 2025 revenue. Nevertheless, Amgen continues to defend the medicine, which was acquired in the $3.7 billion buyout of ChemoCentryx.
The FDA greenlit 26 novel therapies in the first half of 2026, including four for cancer and six for orphan indications. Meanwhile, AstraZeneca and Johnson and Johnson took home a combined 11 of the agency’s 79 total approvals, including supplemental nods.
Saol Therapeutics is the latest biotech to resubmit for approval of a drug rejected under former FDA Commissioner Marty Makary, following REGENXBIO and Replimune.
Even as FDA approvals for biologic therapies fell in the first half of 2026, regulatory experts are optimistic about a turnaround in the rare disease space after the departure of key leaders at the agency. Still, there will continue to be tension between science and politics.
Vertex Pharmaceuticals’ acquisition of Crinetics Pharmaceuticals is the largest pickup in the company’s history, according to analysts at BMO Capital Markets.
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