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US FDA declines Lantheus’ tumor imaging kit over third-party manufacturing issues

By Thomson Reuters Jun 26, 2026 | 3:19 PM

June 26 (Reuters) – The U.S. Food and Drug Administration declined to approve Lantheus Holdings’ diagnostic imaging kit for ​types of cancer tumors, citing unresolved ‌issues at a third-party manufacturing facility, the company said on Friday.

This marks another setback for Lantheus, as the health regulator had in March ‌extended ​its review of the ⁠imaging kit, LNTH-2501, ⁠by three months.

The FDA did not identify any concerns regarding the data submitted by Lantheus or the safety and efficacy ​of LNTH-2501, the company said.

“The feedback received from the FDA relates solely ⁠to our third-party manufacturer, ⁠and not to the clinical ​performance of the product,” said CEO Mary ​Anne Heino.

The company is working with the ‌manufacturer and the regulator to address the concerns, Heino said.

LNTH-2501 is a diagnostic radiopharmaceutical kit used with PET scans ⁠to detect neuroendocrine tumors, or NETs — cancers that arise in hormone-producing cells in organs such as ⁠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 four in every 100,000 adults, according to the National Institutes of Health.

(Reporting by Sahil Pandey and Puyaan Singh in Bengaluru; Editing by ​Sahal Muhammed)