(Bloomberg) -- Novartis AG suffered its third clinical-trial setback in a week after a treatment for a rare muscle-wasting disease failed a late-stage study, raising questions about the drugmaker’s growth prospects.

The failure of “del-desiran,” which Novartis got through a $12 billion acquisition, could raise questions about the company’s business development acumen, according to one analyst.

Shares of Novartis tanked on Tuesday after results from its del-desiran drug trial disappointed investors.