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use of drugs &#40;e&#46;g&#46;&#44; acetaminophen&#41; or alcohol&#44; and viral infections&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">3&#41;</span><p id="par0025" class="elsevierStylePara elsevierViewall">MMP&#174; is a drug delivery technique that uses microneedles and dermo pigmentation equipment&#46; Tattoos are unequivocal evidence of injection and absorption&#46; The main advantages of this technique are the uniform drug distribution in the dermis&#44; without bolus formation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#44; and increased substance dispersion due to shear stress and turbulent whirling<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> caused by Newton&#8217;s law of attrition&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">4&#41;</span><p id="par0030" class="elsevierStylePara elsevierViewall">Drug absorption delivered through MMP&#174; occurs predominantly through the lymphatic channels of the skin<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> and not the subjacent blood vessels&#46;</p></li><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">5&#41;</span><p id="par0035" class="elsevierStylePara elsevierViewall">MMP&#174; is the only drug delivery technique with published protocols that allow the quantification of the drug density injected in the dermis&#44;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> offering safety parameters to the dermatologist&#46;</p></li><li class="elsevierStyleListItem" id="lsti0030"><span class="elsevierStyleLabel">6&#41;</span><p id="par0040" class="elsevierStylePara elsevierViewall">Since the procedure was done in an ophiasis region &#40;423&#8239;cm<span class="elsevierStyleSup">2</span>&#41;&#44; using a saline solution &#40;estimated density 1&#46;000&#46;000&#8239;&#181;g&#47;mL&#41; and the medication contained 25&#8239;mg&#47;mL of the active ingredient&#44; based on published protocols we calculate that 390&#46;907&#8239;&#181;g &#40;0&#46;390907&#8239;mg&#41; of the methotrexate solution was injected in the dermis<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> &#40;Video 1&#41;&#44; which corresponds to 9&#46;8&#8239;mg of methotrexate&#46;</p></li></ul></p><p id="par0045" class="elsevierStylePara elsevierViewall">Considering the aforementioned facts&#44; and the lack of other reports of possible drug toxicity related to methotrexate MMP&#174; drug delivery&#44; we must consider an alternative hypothesis for the findings described by Nogueira et al&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> It is possible that this patient&#8217;s mild transient increase in transaminases may have occurred by chance or have been caused by other factors unrelated to methotrexate MMP&#174; drug delivery&#63;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Financial support</span><p id="par0050" class="elsevierStylePara elsevierViewall">TRADERM&#44; a company that commercializes tattoo supplies&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Authors&#39; contributions</span><p id="par0055" class="elsevierStylePara elsevierViewall">Samir Arbache&#58; Conceptualization&#59; data curation&#59; writing-original draft&#59; and writing-review and editing&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Sergio Henrique Hirata&#58; Conceptualization&#59; data curation&#59; writing-original draft&#59; and writing-review and editing&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of interest</span><p id="par0065" class="elsevierStylePara elsevierViewall">MMP&#174;&#44; a registered trademark in Brazil&#44; the United States&#44; and Europe&#44; grants free use exclusively to dermatologists who are members of the Brazilian Society of Dermatology and equivalent associations in the world&#46; Dr&#46; Arbache owns the company that commercializes the supplies used for MMP and is part of a team of professionals who train Brazilian dermatologists in to use of this technique&#46;</p></span></span>"
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Comment on “Elevation of transaminases after MMP® session with methotrexate for alopecia areata treatment - how much do we know about the risks of systemic absorption of the technique?”
Samir Arbachea,
Corresponding author
samir@dermocentro.com.br

Corresponding author.
, Sergio Henrique Hiratab
a DermoCentro Clinic, São José dos Campos, SP, Brazil
b Department of Dermatology, Universidade Federal de São Paulo, São Paulo, SP, Brazil
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">We read with interest Nogueira&#8217;s et al&#46; recent case report&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> This is an important contribution to the limited evidence about the safety of drug delivery techniques&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">As an experienced and enthusiastic user of the MMP&#174; technique&#44; I have a few considerations&#58;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">1&#41;</span><p id="par0015" class="elsevierStylePara elsevierViewall">Although evidence derived from case reports is considered low&#44; nevertheless it is important to raise questions in different scenarios&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">2&#41;</span><p id="par0020" class="elsevierStylePara elsevierViewall">Changes in liver enzyme levels are common in clinical practice and can be caused by many factors including physical activity&#44; use of drugs &#40;e&#46;g&#46;&#44; acetaminophen&#41; or alcohol&#44; and viral infections&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">3&#41;</span><p id="par0025" class="elsevierStylePara elsevierViewall">MMP&#174; is a drug delivery technique that uses microneedles and dermo pigmentation equipment&#46; Tattoos are unequivocal evidence of injection and absorption&#46; The main advantages of this technique are the uniform drug distribution in the dermis&#44; without bolus formation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#44; and increased substance dispersion due to shear stress and turbulent whirling<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> caused by Newton&#8217;s law of attrition&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">4&#41;</span><p id="par0030" class="elsevierStylePara elsevierViewall">Drug absorption delivered through MMP&#174; occurs predominantly through the lymphatic channels of the skin<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> and not the subjacent blood vessels&#46;</p></li><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">5&#41;</span><p id="par0035" class="elsevierStylePara elsevierViewall">MMP&#174; is the only drug delivery technique with published protocols that allow the quantification of the drug density injected in the dermis&#44;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> offering safety parameters to the dermatologist&#46;</p></li><li class="elsevierStyleListItem" id="lsti0030"><span class="elsevierStyleLabel">6&#41;</span><p id="par0040" class="elsevierStylePara elsevierViewall">Since the procedure was done in an ophiasis region &#40;423&#8239;cm<span class="elsevierStyleSup">2</span>&#41;&#44; using a saline solution &#40;estimated density 1&#46;000&#46;000&#8239;&#181;g&#47;mL&#41; and the medication contained 25&#8239;mg&#47;mL of the active ingredient&#44; based on published protocols we calculate that 390&#46;907&#8239;&#181;g &#40;0&#46;390907&#8239;mg&#41; of the methotrexate solution was injected in the dermis<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> &#40;Video 1&#41;&#44; which corresponds to 9&#46;8&#8239;mg of methotrexate&#46;</p></li></ul></p><p id="par0045" class="elsevierStylePara elsevierViewall">Considering the aforementioned facts&#44; and the lack of other reports of possible drug toxicity related to methotrexate MMP&#174; drug delivery&#44; we must consider an alternative hypothesis for the findings described by Nogueira et al&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> It is possible that this patient&#8217;s mild transient increase in transaminases may have occurred by chance or have been caused by other factors unrelated to methotrexate MMP&#174; drug delivery&#63;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Financial support</span><p id="par0050" class="elsevierStylePara elsevierViewall">TRADERM&#44; a company that commercializes tattoo supplies&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Authors&#39; contributions</span><p id="par0055" class="elsevierStylePara elsevierViewall">Samir Arbache&#58; Conceptualization&#59; data curation&#59; writing-original draft&#59; and writing-review and editing&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Sergio Henrique Hirata&#58; Conceptualization&#59; data curation&#59; writing-original draft&#59; and writing-review and editing&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Conflicts of interest</span><p id="par0065" class="elsevierStylePara elsevierViewall">MMP&#174;&#44; a registered trademark in Brazil&#44; the United States&#44; and Europe&#44; grants free use exclusively to dermatologists who are members of the Brazilian Society of Dermatology and equivalent associations in the world&#46; Dr&#46; Arbache owns the company that commercializes the supplies used for MMP and is part of a team of professionals who train Brazilian dermatologists in to use of this technique&#46;</p></span></span>"
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ISSN: 03650596
Original language: English
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