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Sanofi says rare lung disease drug outperforms standard care in trial

By Thomson Reuters May 18, 2026 | 2:35 PM

(Corrects executive’s name from Alaa Ahmed to Alaa Hamed in paragraphs 7 and 8)

By Bhanvi Satija

LONDON, May 18 (Reuters) – French drugmaker Sanofi said on Monday a trial ​showed its rare disease therapy was better than ‌standard care in raising levels of a key protein in patients with a genetic form of lung disease.

The data in the head-to-head study offers a potential boost to Sanofi’s $2.2 billion bet on efdoralprin alfa, the experimental ‌therapy ​it acquired through its 2024 Inhibrx ⁠deal in the wake ⁠of a run of pipeline setbacks last year.

Sanofi estimates about 235,000 people have the condition and sees an opportunity in switching patients from standard therapy and also in finding ​those who have not been diagnosed. Sanofi first reported in October that the study had met its main goals.

Investors are ⁠looking for evidence that Sanofi’s pipeline ⁠can support growth beyond Dupixent, its top-selling drug. ​The drugmaker has hired CEO Belén Garijo to improve R&D productivity ​and sharpen execution.

Sanofi said the new data, presented at ‌the American Thoracic Society meeting in Orlando, showed that in the 97-patient trial, efdoralprin alfa administered every three weeks raised trough levels for AAT protein by 24.1 micromolar at week ⁠32, versus 7.6 micromolar for weekly plasma-derived standard therapy.

Patients on Sanofi’s therapy maintained normal levels of AAT, or alpha-1 antitrypsin, throughout the ⁠study, compared with ‌less than half the time for those on ⁠standard therapy. Without enough AAT, lungs and ​liver can ‌both become damaged.

Unlike plasma-derived treatments, efdoralprin alfa ​is produced ⁠using recombinant technology, potentially easing dependence on donated plasma, said Alaa Hamed, Sanofi’s head of medical affairs for rare diseases.

Hamed said the drug’s less frequent dosing could also appeal to patients for whom weekly treatment is a burden.

(Reporting by Bhanvi Satija; Editing ​by Alexander Smith)