
Shares of drug developer MBX Biosciences MBX.O surge 84% to $18.5 in premarket trading
MBX says its once-weekly experimental drug, canvuparatide, met main goal in mid-stage trial for adults with chronic hypoparathyroidism, a hormone disorder that causes low calcium levels
In 12-week study, 63% of patients on canvuparatide kept calcium in normal range without needing active vitamin D or more than 600 mg of daily calcium supplements, compared with 31% on placebo, difference of which was statically significant
The drug was well tolerated with no serious adverse events, company says
MBX plans to start late-stage trial in 2026
As of last close, MBX stock was down 45.7% YTD