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http://dx.doi.org/10.1056/NEJMicm1909329DOI Listing

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5-Fluorouracil (5-FU), an effective chemotherapeutic agent for many solid tumors, has long been reported to cause pigmentation in patients treated intravenously, which occurs with increasing frequency of administration and decreases the QOL of the patients. Although melanin accumulation is thought to be the cause, the mechanism of pigmentation induced by 5-FU administration remains unclear, and there is no effective treatment for this problem. In this study, we investigated the mechanism of pigmentation induced by continuous 5-FU administration in 9-week-old male HRM-2 hairless mice for 8 weeks by focusing on the blood vessels for basic verification.

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A 42-year-old woman being treated with 5-fluorouracil for carcinoma of the sigmoid colon developed persistent serpentine supravenous hyperpigmented eruption (PSSHE), bilateral mottling of the palms and diffuse hyperpigmentation of the soles. To the best of our knowledge, such a combination of findings has not been reported earlier. Recognition and knowledge of this side effect are important as the dose of the drug need not be altered nor is there a need to replace the drug on worries about a serious adverse effect.

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