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After lutetium-177 treatment for prostate cancer or neuroendocrine tumours, patients are told how long to avoid pregnancy or breastfeeding, but the numbers differ by source: 3 months, 14 weeks, 4 months, 6 months or 7 months. A single table, with the reasoning for each figure, would let teams and families give the same answer.
What the sources say. The US label for Pluvicto (lutetium-177 vipivotide tetraxetan) advises men with female partners of reproductive potential to use effective contraception for 14 weeks after the last dose. The US label for Lutathera (lutetium-177 dotatate) advises women of reproductive potential 7 months and men 4 months, and no breastfeeding for 2.5 months after the last dose. The joint EANM/SNMMI procedure guideline for lutetium-177 PSMA therapy (2023) advises contraception during and for 3 months after therapy, and introduces this advice with the words "Without specific evidence for 177Lu-PSMA-RLT". The joint IAEA, EANM and SNMMI guidance on peptide receptor radionuclide therapy (2013) advises women to avoid pregnancy for at least 6 months. The European product information could not be read by script, so European and UK figures are not included.
Why it matters. A family hears different numbers from a leaflet, a website and a clinician, with no way to know which applies or why. The figures derive from different reasoning (radiation dose, genotoxicity, sperm and egg development cycles, drug excretion) that the documents mostly do not state side by side.
What is unknown. No study compares the intervals, and none has measured whether patients understand or follow them.
Shares Knowledge reaches practice too slowly and the tags protocol-upgrade, upgrade:untested.
Shares Knowledge reaches practice too slowly and the tags protocol-upgrade, upgrade:untested.
Shares Knowledge reaches practice too slowly and the tags protocol-upgrade, upgrade:untested.
Shares the tags protocol-upgrade, upgrade:untested.
Shares the tags protocol-upgrade, upgrade:untested.
Shares the tags protocol-upgrade, upgrade:untested.
Shares the tags protocol-upgrade, upgrade:untested.
Shares the tags protocol-upgrade, upgrade:untested.
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