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Objectives: APOLLO study, 'efficacy and safety of the deodorAnt Pad against Odour and uLceration for LOcally advanced breast cancer', aimed to assess the safety and efficacy of wearing a deodorant pad in patients with locally advanced breast cancer (LABC) with an ulceration., Methods: Komagome Pads were previously developed by Juntendo University and Kao Corporation. In test A, a conventional pad consisting of gauze, a commercially available diaper, pad, etc and the Komagome Pad were compared over 3 days to assess their efficacy and possible improvements for short-term use. In test B, the Komagome Pad was used continuously for 1 month to evaluate its safety during long-term use., Results: This study included 14 patients in test A and nine in test B. In odour evaluation using sensory testing in test A, nine patients reported more significant efficacy in odour suppression with the Komagome Pad. The odour intensity of the Komagome Pad was lower on the gas chromatography-mass spectrometry. The group with a high level of exudation reported significantly higher satisfaction with the Komagome Pad. In test B, no adverse events were observed., Conclusions: A new deodorant pad for LABC demonstrated high safety and deodorant efficacy., Competing Interests: Competing interests: HI, MI, YT and MS are permanent employees of Kao Corporation. Other authors have no conflict of interest with this article. Kao Corporation was involved in the preparation of this article in terms of odour collection, analysis and statistical interpretation of the data., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)