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US FDA extends review of Lantheus’ diagnostic imaging kit by three months

By Thomson Reuters Mar 17, 2026 | 3:17 PM

March 17 (Reuters) – Lantheus Holdings said on Tuesday that the U.S. health regulator has extended its review of the company’s diagnostic imaging kit by ​three months as it needs more time ‌to review manufacturing-related information.

Shares of the Bedford-based company were down over 2% in extended trading.

Lantheus said the review extension is not related to efficacy or safety data, and the Food and ‌Drug ​Administration will decide on approval ⁠for the diagnostic kit, ⁠LNTH-2501, by June 29.

LNTH-2501 is designed to help doctors find a type of cancer called neuroendocrine tumors, or NETs, using a PET scan — a type of ​medical imaging.

While the delay is a slight disappointment, “we are nevertheless relieved that the extension is not ⁠related to the clinical profile,” William ⁠Blair analyst Andy Hsieh said in ​a research note.

NETs are cancers that begin in hormone-producing cells ​found throughout the body, most often in the ‌lungs, pancreas and digestive tract.

The condition is more common in adults than children, and the slow-growing subtype once known as carcinoid tumor affects about 4 in every ⁠100,000 adults, while cases in young people remain so rare that reliable data are lacking, according to National Institutes ⁠of Health.

LNTH-2501 is ‌a two-vial kit that lets radiopharmacies ⁠quickly mix the drug with gallium from ​their ‌own generator to make the final injection.

Hsieh ​expects the ⁠kit to launch in the third quarter, noting that earlier forecasts already included a one-quarter buffer and estimates about $2  million in sales for the third quarter and $5  million for the fourth.

(Reporting by Kamal Choudhury in Bengaluru; Editing ​by Shailesh Kuber)