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Una revisión narrativa" "tienePdf" => "es" "tieneTextoCompleto" => "es" "tieneResumen" => array:2 [ 0 => "es" 1 => "en" ] "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "374" "paginaFinal" => "386" ] ] "titulosAlternativos" => array:1 [ "en" => array:1 [ "titulo" => "Popular Diets and Skin Effects: A Narrative Review" ] ] "contieneResumen" => array:2 [ "es" => true "en" => true ] "contieneTextoCompleto" => array:1 [ "es" => true ] "contienePdf" => array:1 [ "es" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig0010" "etiqueta" => "Figura 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 848 "Ancho" => 755 "Tamanyo" => 61265 ] ] "descripcion" => array:1 [ "es" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Prurigo pigmentosa, <span class="elsevierStyleItalic">keto rash</span>. Placas eritematosas muy pruriginosas en la espalda dorsal. Nótese la sutil hiperpigmentación postinflamatoria reticulada en la zona dorsal central. La paciente seguía una dieta cetogénica estricta desde hacía 4 meses, con una significativa reducción de peso. El cuadro clínico remitió completamente tras la administración de doxiciclina 100<span class="elsevierStyleHsp" style=""></span>mg/día por un mes, junto con el cese de la dieta.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "M. Mansilla-Polo, J. Piquero-Casals, D. Morgado-Carrasco" "autores" => array:3 [ 0 => array:2 [ "nombre" => "M." "apellidos" => "Mansilla-Polo" ] 1 => array:2 [ "nombre" => "J." "apellidos" => "Piquero-Casals" ] 2 => array:2 [ "nombre" => "D." 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Morelló Vicente, I. Oteiza Rius, L. Aguado Gil" "autores" => array:3 [ 0 => array:2 [ "nombre" => "A." "apellidos" => "Morelló Vicente" ] 1 => array:2 [ "nombre" => "I." "apellidos" => "Oteiza Rius" ] 2 => array:2 [ "nombre" => "L." 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Morelló Vicente, I. Oteiza Rius, L. Aguado Gil" "autores" => array:3 [ 0 => array:2 [ "nombre" => "A." "apellidos" => "Morelló Vicente" ] 1 => array:4 [ "nombre" => "I." "apellidos" => "Oteiza Rius" "email" => array:1 [ 0 => "ioteiza@unav.es" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 2 => array:2 [ "nombre" => "L." "apellidos" => "Aguado Gil" ] ] "afiliaciones" => array:1 [ 0 => array:2 [ "entidad" => "Departamento de Dermatología, Clínica Universidad de Navarra, Pamplona, Navarra, Spain" "identificador" => "aff0005" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Queratosis actínicas en pacientes trasplantados de órgano sólido: revisión de la literatura" ] ] "resumenGrafico" => array:2 [ "original" => 1 "multimedia" => array:5 [ "identificador" => "fig0005" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => false "mostrarDisplay" => true "figura" => array:1 [ 0 => array:4 [ "imagen" => "fx1.jpeg" "Alto" => 749 "Ancho" => 1333 "Tamanyo" => 82723 ] ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Actinic keratoses (AK) are precancerous skin lesions induced by high exposure to ultraviolet (UV) radiation and, therefore, a marker of chronic sun damage.<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">1</span></a> Clinically, they appear as 1<span class="elsevierStyleHsp" style=""></span>mm to 2.5<span class="elsevierStyleHsp" style=""></span>cm brown-red papules and plaques with a rough, hyperkeratotic surface, mainly on sun-exposed areas such as face, lower lip, bald scalp, neck, arms, and hands.<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">2</span></a> Chronic sun damage triggers not only the appearance of these palpable lesions, but also to the presence of subclinical AK. The skin surface affected by actinic damage, both clinical and subclinical, is referred to as the field cancerization.<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">3</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Several risk factors contribute to the development of AK, including advanced age, male gender, cumulative sun exposure, fair skin (Fitzpatrick skin types I and II), baldness, and immunosuppression.<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">4</span></a> Solid organ transplant recipients (SOTR) experience a higher incidence of AK and non-melanoma skin cancer compared to the overall population. In these patients, there is also a greater progression of precancerous lesions from AK to squamous cell carcinoma (SCC).</p><p id="par0015" class="elsevierStylePara elsevierViewall">AK are considered dynamic conditions that can persist, regress, recur, and progress into invasive SCC. In immunocompetent patients, the progression rate is between 0% and 0.075% per lesion/year, up to 0.89% if there is a history of non-melanoma skin cancer (whether invasive or not). When AK are part of a field cancerization, or the patient is immunocompromised, this risk increases considerably.<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">5</span></a> Regarding the regression of AK in transplant recipients, for specific lesions, a spontaneous resolution rate of 0% has been reported vs 28% in immunocompetent individuals. Similarly, the histopathological examination estimates that nearly 70% of SCC develop from AK.<a class="elsevierStyleCrossRefs" href="#bib0245"><span class="elsevierStyleSup">2,4</span></a> SOTS with AK are 32 times more likely to develop SCC. Additionally, 95% of the patients with SCC also have AK.<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">6</span></a> Therefore, acting early on AK is crucial to prevent the development of SCC.<a class="elsevierStyleCrossRef" href="#bib0270"><span class="elsevierStyleSup">7</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">We should also mention that after the first post-transplant skin cancer, SOTR have a risk between 45% and 57% of developing another skin cancer. The risk of developing > 10 skin cancers within the next 2 years is nearly 3% to 7%, and 25% will have synchronous lesions.<a class="elsevierStyleCrossRef" href="#bib0275"><span class="elsevierStyleSup">8</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Treatment</span><p id="par0025" class="elsevierStylePara elsevierViewall">Since SCC is the most common neoplasm in SOTR, with an incidence rate 60 to 100 times higher compared to immunocompetent individuals, and an increased rate of metastasis (8% in SOTR vs 1% to 4% in the overall population), it is mandatory to treat its precursor lesion, AK.<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">1,9</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Therapies of AK can be categorized into those directed at single lesions and those aimed at treating the field cancerization.</p><p id="par0035" class="elsevierStylePara elsevierViewall">The most widely used targeted therapies are cryotherapy, CO<span class="elsevierStyleInf">2</span> ablative laser, or excision. Although these techniques allow for a high rate of resolution of single lesions, they lack efficacy vs the preclinical lesions found in the field cancerization, which are more likely to progress into SCC in transplant recipients. Therefore, targeted therapies are considered insufficient in SOTR, meaning that field cancerization-directed therapies are absolutely necessary.<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">10</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">This article aims to review various field cancerization-directed therapies and strategies to prevent AK in SOTR.</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Field cancerization-directed therapies</span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Conventional photodynamic therapy</span><p id="par0045" class="elsevierStylePara elsevierViewall">Conventional photodynamic therapy (PDT) involves the application of photosensitizing agents (5-aminolevulinic acid [ALA] or methyl aminolevulinate [MAL]) to the region of interest, and use of a light source with a wavelength between 404<span class="elsevierStyleHsp" style=""></span>nm and 420<span class="elsevierStyleHsp" style=""></span>nm (blue light), or 635<span class="elsevierStyleHsp" style=""></span>nm (red light).<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">3</span></a> It is the most widely studied treatment in SOTR and according to the findings made so far, it has the highest complete response rate to date (40% to 89%).10 Higher response rates have been reported in patients treated with 2 cycles of PDT. We should mention that response rates are lower for AK on the hands (22% to 40%).<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">11</span></a> No comparative trials have ever been performed between ALA and MAL in transplant recipients. The latter offers the advantage of better skin penetration thanks to its lipophilicity and greater specificity in treating neoplastic cells.<a class="elsevierStyleCrossRef" href="#bib0295"><span class="elsevierStyleSup">12</span></a> However, in immunocompetent patients, there does not seem to be significant differences between the 2 photosensitizers, and even PDT with ALA may yield better results after a 1-year course of treatment.<a class="elsevierStyleCrossRefs" href="#bib0300"><span class="elsevierStyleSup">13,14</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">Despite the good results obtained, a drawback of this technique is the pain it causes in the region of interest during and after PDT sessions.<a class="elsevierStyleCrossRefs" href="#bib0290"><span class="elsevierStyleSup">11,15</span></a> This feeling may be greater in transplant recipients, likely due to their larger field cancerization compared to that of immunocompetent patients.<a class="elsevierStyleCrossRef" href="#bib0290"><span class="elsevierStyleSup">11</span></a></p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Daylight photodynamic therapy</span><p id="par0055" class="elsevierStylePara elsevierViewall">Daylight photodynamic therapy (dPDT) uses UV radiation to activate the photosensitizer, making it useful to treat a larger field cancerization. Patients treated with dPDT had fewer new-onset AK lesions at the 3-, 9-, 15-, and 21-month follow-up compared to cryotherapy. Additionally, these patients showed a preference for this field treatment.<a class="elsevierStyleCrossRef" href="#bib0315"><span class="elsevierStyleSup">16</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Studies have been conducted where ablative laser therapy is used prior to the application of the photosensitizer to improve the efficacy rates. This would lead to better drug absorption, especially in thicker and more hyperkeratotic lesions. Differences in the complete response after 4 months of treatment have been reported, ranging from 75.5% to 64%, respectively, depending on whether laser therapy is previously used or not,<a class="elsevierStyleCrossRef" href="#bib0320"><span class="elsevierStyleSup">17</span></a> being these results consistent with those from former studies.<a class="elsevierStyleCrossRef" href="#bib0325"><span class="elsevierStyleSup">18</span></a></p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Imiquimod</span><p id="par0065" class="elsevierStylePara elsevierViewall">Imiquimod is a toll-like receptor 7 agonist, which triggers the activation of numerous cellular proteins, being nuclear factor kappa B a notable example. This induces the release of cytokines that will eventually activate the immune system vs antigens expressed in atypical keratinocytes, ultimately leading to their death.<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">3</span></a></p><p id="par0070" class="elsevierStylePara elsevierViewall">Despite immunosuppressive therapy in transplant recipients reduces the activity of the immune system and possibly the efficacy profile of the drug,<a class="elsevierStyleCrossRef" href="#bib0330"><span class="elsevierStyleSup">19</span></a> complete response rates (between 28% and 62.1%) have been reported 3 months, or 8 weeks, respectively, after completing treatment.<a class="elsevierStyleCrossRefs" href="#bib0310"><span class="elsevierStyleSup">15,20</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">Conflicting data surround sustained responses, being these responses maintained in 7% to 80% of the patients at the 1-year follow-up.<a class="elsevierStyleCrossRefs" href="#bib0340"><span class="elsevierStyleSup">21,22</span></a> These differences may be due to variations in the therapeutic regimens across the different studies.</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">5-Fluorouracil (5-FU)</span><p id="par0080" class="elsevierStylePara elsevierViewall">The action of 5-FU is based on the inhibition of thymidylate synthase, resulting in the inhibition of DNA synthesis and interference in the formation and function of RNA, which eventually triggers the death of target cells.<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">3</span></a></p><p id="par0085" class="elsevierStylePara elsevierViewall">Data on the efficacy profile of 5-FU treatment in immunosuppressed patients are scarce, with varying and difficult-to-compare results due to the different review times involved. Ingham et al. reported a complete response rate of 63% in patients 8 weeks into treatment, and a partial response rate of 71% at 1 year in 8 SOTR.<a class="elsevierStyleCrossRef" href="#bib0350"><span class="elsevierStyleSup">23</span></a> Perret et al. compared 5-FU treatment (one 3-week cycle) and MAL-PDT in 7 renal transplant recipients, with complete response rates of 11% at 6 months for 5-FU and 89% for MAL-PDT.<a class="elsevierStyleCrossRef" href="#bib0355"><span class="elsevierStyleSup">24</span></a> Recently, Hasan Zu et al. conducted a study that compared 3 cohorts of 40 SOTR treated with 5-FU at 5%, imiquimod, and sunscreen, with 1-year partial response rates of 58%, 29%, and 15%, respectively (the difference between imiquimod and the sunscreen was not significant), and total response rates of 17%, 7%, and 8%, being these differences also nonsignificant.<a class="elsevierStyleCrossRef" href="#bib0345"><span class="elsevierStyleSup">22</span></a></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Tirbanibulin</span><p id="par0090" class="elsevierStylePara elsevierViewall">Tirbanibulin is a recently approved therapy vs non-hyperkeratotic and non-hypertrophic AK (Olsen I). Tirbanibulin is a synthetic antiproliferative agent which by binding to tubulin, inhibits its polymerization and disrupts Src signaling in actively dividing cells. This mechanism of action leads to cell cycle arrest, abnormal mitosis, and eventually apoptosis.<a class="elsevierStyleCrossRef" href="#bib0360"><span class="elsevierStyleSup">25</span></a></p><p id="par0095" class="elsevierStylePara elsevierViewall">No data have been published to this date on the efficacy and safety profile of tirbanibulin therapy in immunosuppressed patients. To date, only 2 stage III clinical trials have been conducted in immunocompetent patients, achieving a nearly 50% complete response on day 57, with 53% of them remaining recurrence-free at the 1-year follow-up.<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">26</span></a></p><p id="par0100" class="elsevierStylePara elsevierViewall">The most common side effects are local and transient, being redness and scaling notable and happening after completing therapy.<a class="elsevierStyleCrossRef" href="#bib0365"><span class="elsevierStyleSup">26</span></a></p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Diclofenac</span><p id="par0105" class="elsevierStylePara elsevierViewall">Diclofenac is a non-steroidal anti-inflammatory drug that inhibits cyclooxygenase-2 and the synthesis of prostaglandins. The exact mechanism by which diclofenac acts in the management of AK remains unclear. However, it is believed to be due to its anti-inflammatory and antiangiogenic properties, leading to antiproliferative and apoptotic effects.3</p><p id="par0110" class="elsevierStylePara elsevierViewall">Only 1 clinical trial has ever been conducted in SOTR comparing diclofenac at 3% in hyaluronic acid vs a vehicle. In the trial, on week 20, the complete response rate reported was 41% in patients on a 16-week course of diclofenac, a response that was maintained in 45% of patients at the 2-year follow-up.<a class="elsevierStyleCrossRef" href="#bib0370"><span class="elsevierStyleSup">27</span></a></p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">What therapy should be selected in each case?</span><p id="par0115" class="elsevierStylePara elsevierViewall">There are numerous studies on the management of AK among immunocompetent patients. However, evidence on the most effective therapy to treat AK and field cancerization in SOTR is still scarce. Therefore, there is uncertainty on what the best practices are for different patients. However, recommendations have been made based on expert dermatologist consensus on the management of AK in SOTR based on the presence of actinic damage and the past medical history of non-melanoma skin tumors.<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">28</span></a></p><p id="par0120" class="elsevierStylePara elsevierViewall">Based on these recommendations, the treatment of choice for isolated AK is cryotherapy, being necessary to treat field cancerization when AK appears clustered in a certain anatomical area. Field cancerization-directed therapies can be challenging due to patient compliance issues. Given the higher incidence and recurrence of AK in SOTR, they are more likely to require multiple cycles, and a combination of different therapeutic alternatives.</p><p id="par0125" class="elsevierStylePara elsevierViewall">We should mention the need to make regular follow-up appointments with the dermatologist to screen for new-onset lesions, at least, every 6 to 12 months.<a class="elsevierStyleCrossRef" href="#bib0380"><span class="elsevierStyleSup">29</span></a></p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Prevention</span><p id="par0130" class="elsevierStylePara elsevierViewall">The primary goal of AK prevention techniques is to avoid and reduce the number of these lesions and, consequently, the risk of SCC. Primary prevention through patient education and the use of sunscreen should be recommended for all SOTR. Regarding secondary and tertiary prevention, different options are advised for high-risk patients only.</p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Sunscreen</span><p id="par0135" class="elsevierStylePara elsevierViewall">Sun exposure is the most important modifiable risk factor for the development of AK and SCC in SOTR. However, routine use of sunscreen in this population is simply not enough.<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">1</span></a> Significant differences have been reported in the occurrence of AK and SCC when comparing the regular and the intermittent use of sunscreen over a 2-year span.<a class="elsevierStyleCrossRef" href="#bib0385"><span class="elsevierStyleSup">30</span></a></p><p id="par0140" class="elsevierStylePara elsevierViewall">Some sunscreens have been specifically designed for chronic sun damage to prevent the appearance of premalignant and malignant skin lesions. Supplementation with DNA repair enzymes helps protect against the damage caused by UV light. These enzymes include photolyase, T4 endonuclease V, UV endonuclease, and OGG1 endonuclease.<a class="elsevierStyleCrossRef" href="#bib0390"><span class="elsevierStyleSup">31</span></a></p><p id="par0145" class="elsevierStylePara elsevierViewall">The incidence of low levels of vitamin D in SOTR should also be taken into consideration following the recommendation of avoiding sun exposure, and using glucocorticoids in some patients. Glucocorticoids can increase the breakdown of 25-hydroxyvitamin D. Therefore, lab tests should be conducted among this population, and supplementation administered when necessary, as it is safe and effective to do so.<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">1</span></a></p></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Immunosuppression</span><p id="par0150" class="elsevierStylePara elsevierViewall">The immunosuppression used in SOTR promotes the development of new AK and SCC. The most widely used drugs are calcineurin inhibitors (tacrolimus and cyclosporine), antiproliferatives (azathioprine, mycophenolate mofetil), and recently, mTOR inhibitors (sirolimus and everolimus). In addition to the differences reported in the intensity and duration of immunosuppression, not all immunosuppressants carry the same risk.1 Tacrolimus and azathioprine are 2 immunosuppressants most commonly associated with the development of SCC.<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">1,28</span></a> In contrast, mTOR inhibitors have proven capable of reducing the number of non-melanoma skin cancers in SOTR when added to, or in lieu of older immunosuppressants.<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">1,32,33</span></a> Additionally, it has been reported that sirolimus delays the development of AK, and even induces regression and slows down the incidence of new SCC.<a class="elsevierStyleCrossRefs" href="#bib0405"><span class="elsevierStyleSup">34,35</span></a> These can often start right after transplantation, and are often associated with the use of prednisone and mycophenolate mofetil.<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a></p><p id="par0155" class="elsevierStylePara elsevierViewall">The conversion from azathioprine to mycophenolate mofetil should be considered whenever possible.1 Substituting calcineurin inhibitors with mTOR inhibitors and reducing immunosuppression are also valid strategies to minimize the incidence rate of AK and SCC. It is recommended to make these immunosuppression changes in SOTR with > 10 SCCs/year, or in those with high-risk SCC. The immunosuppression regimen should always be discussed with the transplant team.<a class="elsevierStyleCrossRefs" href="#bib0240"><span class="elsevierStyleSup">1,28</span></a></p><p id="par0160" class="elsevierStylePara elsevierViewall">Despite the decreased incidence of AK and SCC, mTOR inhibitors have side effects that can limit their use and lead to drug discontinuation. Common adverse events include mouth ulcers, edema, acneiform reactions, hyperlipidemia, thrombocytopenia, leukopenia, delayed wound healing, and postoperative complications.<a class="elsevierStyleCrossRef" href="#bib0410"><span class="elsevierStyleSup">35</span></a></p><p id="par0165" class="elsevierStylePara elsevierViewall">Currently, topical sirolimus has various indications without the severe adverse events associated with this drug. Recently, its potential efficacy profile to reduce keratinocytic lesions has been reported, with a 3-fold reduction in in situ SCCs at 24 weeks vs placebo, with no differences being reported in the overall number of SCCs.<a class="elsevierStyleCrossRef" href="#bib0415"><span class="elsevierStyleSup">36</span></a></p></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Retinoids</span><p id="par0170" class="elsevierStylePara elsevierViewall">Retinoids are the most effective strategy to prevent AK and SCC in high-risk populations.<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a> Acitretin can prevent both premalignant and malignant skin lesions at skin level.<a class="elsevierStyleCrossRef" href="#bib0425"><span class="elsevierStyleSup">38</span></a> A difference in the number of premalignant keratotic lesions of up to 43% has been reported in 6-month comparisons of SOTR on acitretin vs placebo.<a class="elsevierStyleCrossRef" href="#bib0430"><span class="elsevierStyleSup">39</span></a> Additionally, low-dose acitretin (10<span class="elsevierStyleHsp" style=""></span>mg to 30<span class="elsevierStyleHsp" style=""></span>mg) for a longer period of time has been shown to reduce the occurrence of skin cancer by up to 50% in SOTR with tolerable adverse events.<a class="elsevierStyleCrossRef" href="#bib0435"><span class="elsevierStyleSup">40</span></a> Other retinoids such as isotretinoin could be used in patients who remain intolerant to acitretin, or have near-term pregnancy plans requiring higher doses to reach the desired effects with a poorly established efficacy.<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a></p><p id="par0175" class="elsevierStylePara elsevierViewall">Systemic treatment should be maintained because rebound effects have been reported shortly after drug discontinuation.<a class="elsevierStyleCrossRefs" href="#bib0425"><span class="elsevierStyleSup">38,39,41</span></a></p><p id="par0180" class="elsevierStylePara elsevierViewall">Topical retinoids might be a future option, but their efficacy has not been sufficiently demonstrated to date.<a class="elsevierStyleCrossRef" href="#bib0420"><span class="elsevierStyleSup">37</span></a></p></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Capecitabine</span><p id="par0185" class="elsevierStylePara elsevierViewall">Capecitabine is a prodrug of 5-FU. Its potential preventive therapeutic effect to reduce AK and, consequently, SCC in SOTR has been reported anecdotally.<a class="elsevierStyleCrossRefs" href="#bib0445"><span class="elsevierStyleSup">42,43</span></a> In a case series, the impact of low-dose capecitabine (1<span class="elsevierStyleHsp" style=""></span>g/m<span class="elsevierStyleSup">2</span>/day, with a 1-week break every 14 days) in the management of AK in 15 SOTR was examined. More than half of the patients reduced their incidence of AK, while 20% remained stable.<a class="elsevierStyleCrossRef" href="#bib0455"><span class="elsevierStyleSup">44</span></a></p><p id="par0190" class="elsevierStylePara elsevierViewall">Adverse events associated with this treatment include fatigue, nausea, hand-foot syndrome, gout, or an impaired kidney function. Sometimes, these adverse events can lead to down-titration, or drug discontinuation, so the risk-benefit ratio should always be taken into consideration prior to using this therapy.<a class="elsevierStyleCrossRefs" href="#bib0445"><span class="elsevierStyleSup">42–44</span></a></p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Nicotinamide</span><p id="par0195" class="elsevierStylePara elsevierViewall">Nicotinamide is a form of vitamin B<span class="elsevierStyleInf">3</span> that could reduce UV radiation-induced immunosuppression and enhance DNA repair, thereby reducing both the field cancerization and the number of skin cancers.<a class="elsevierStyleCrossRef" href="#bib0460"><span class="elsevierStyleSup">45</span></a></p><p id="par0200" class="elsevierStylePara elsevierViewall">Unlike in immunocompetent patients, in whom there seems to be fewer skin neoplasms (but not AK).<a class="elsevierStyleCrossRefs" href="#bib0460"><span class="elsevierStyleSup">45,46</span></a>, recent reports have shown no significant differences in transplant recipients after comparing nicotinamide (500<span class="elsevierStyleHsp" style=""></span>mg/12<span class="elsevierStyleHsp" style=""></span>hours) to placebo, both in skin neoplasms and AK.<a class="elsevierStyleCrossRef" href="#bib0470"><span class="elsevierStyleSup">47</span></a></p></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Expert recommendations</span><p id="par0205" class="elsevierStylePara elsevierViewall">According to the consensus of expert dermatologists, acitretin therapy and changing the immunosuppressive regimen should be spared for patients with multiple, or high-risk skin cancer.<a class="elsevierStyleCrossRef" href="#bib0375"><span class="elsevierStyleSup">28</span></a></p></span></span></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Conclusions</span><p id="par0210" class="elsevierStylePara elsevierViewall">SOTR require special attention from dermatologists. Due to the risk of progression to SCC, patient education, regular screenings, prevention, and ongoing treatment of AK are mandatory. Transplant recipients should be treated holistically. Single lesions and the field cancerization need to be treated as well. Also, recurrent treatment cycles and the combination of various therapies will often be required. Regarding new lesion prevention in high-risk patients, the use of oral retinoids and change of immunosuppression should be considered.</p></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Conflicts of interest</span><p id="par0215" class="elsevierStylePara elsevierViewall">None declared.</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:10 [ 0 => array:3 [ "identificador" => "xres2200416" "titulo" => "Graphical abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0005" ] ] ] 1 => array:3 [ "identificador" => "xres2200417" "titulo" => "Abstract" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0010" ] ] ] 2 => array:2 [ "identificador" => "xpalclavsec1846701" "titulo" => "Keywords" ] 3 => array:3 [ "identificador" => "xres2200415" "titulo" => "Resumen" "secciones" => array:1 [ 0 => array:1 [ "identificador" => "abst0015" ] ] ] 4 => array:2 [ "identificador" => "xpalclavsec1846700" "titulo" => "Palabras clave" ] 5 => array:2 [ "identificador" => "sec0005" "titulo" => "Introduction" ] 6 => array:3 [ "identificador" => "sec0010" "titulo" => "Treatment" "secciones" => array:1 [ 0 => array:3 [ "identificador" => "sec0015" "titulo" => "Field cancerization-directed therapies" "secciones" => array:14 [ 0 => array:2 [ "identificador" => "sec0020" "titulo" => "Conventional photodynamic therapy" ] 1 => array:2 [ "identificador" => "sec0025" "titulo" => "Daylight photodynamic therapy" ] 2 => array:2 [ "identificador" => "sec0030" "titulo" => "Imiquimod" ] 3 => array:2 [ "identificador" => "sec0035" "titulo" => "5-Fluorouracil (5-FU)" ] 4 => array:2 [ "identificador" => "sec0040" "titulo" => "Tirbanibulin" ] 5 => array:2 [ "identificador" => "sec0045" "titulo" => "Diclofenac" ] 6 => array:2 [ "identificador" => "sec0050" "titulo" => "What therapy should be selected in each case?" ] 7 => array:2 [ "identificador" => "sec0055" "titulo" => "Prevention" ] 8 => array:2 [ "identificador" => "sec0060" "titulo" => "Sunscreen" ] 9 => array:2 [ "identificador" => "sec0065" "titulo" => "Immunosuppression" ] 10 => array:2 [ "identificador" => "sec0070" "titulo" => "Retinoids" ] 11 => array:2 [ "identificador" => "sec0075" "titulo" => "Capecitabine" ] 12 => array:2 [ "identificador" => "sec0080" "titulo" => "Nicotinamide" ] 13 => array:2 [ "identificador" => "sec0085" "titulo" => "Expert recommendations" ] ] ] ] ] 7 => array:2 [ "identificador" => "sec0090" "titulo" => "Conclusions" ] 8 => array:2 [ "identificador" => "sec0095" "titulo" => "Conflicts of interest" ] 9 => array:1 [ "titulo" => "References" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2023-07-10" "fechaAceptado" => "2023-10-16" "PalabrasClave" => array:2 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Keywords" "identificador" => "xpalclavsec1846701" "palabras" => array:4 [ 0 => "Actinic keratosis" 1 => "Squamous cell carcinoma" 2 => "Solid organ transplant recipients" 3 => "Immunosuppression" ] ] ] "es" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "Palabras clave" "identificador" => "xpalclavsec1846700" "palabras" => array:4 [ 0 => "Queratosis actínicas" 1 => "Carcinoma escamoso" 2 => "Trasplantados de órgano sólido" 3 => "Inmunosupresión" ] ] ] ] "tieneResumen" => true "resumen" => array:2 [ "en" => array:2 [ "titulo" => "Abstract" "resumen" => "<span id="abst0010" class="elsevierStyleSection elsevierViewall"><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Pharmacological immunosuppression in solid organ transplant recipients is a significant risk factor in the occurrence of actinic keratosis (AK) and later progression into squamous cell carcinomas (SCC). Treating clinical and preclinical lesions is mandatory in this group of patients due to the high changes of progression into SCC. On the other hand, prevention of AK should be considered because it plays a crucial role.</p><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Several studies have been published on immunocompetent patients, as well as on the management and prevention of AK, but not on immunosuppressed patients.</p><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">This review aims to summarize the current knowledge on the management and prevention measures of AK in solid organ transplant recipients.</p></span>" ] "es" => array:2 [ "titulo" => "Resumen" "resumen" => "<span id="abst0015" class="elsevierStyleSection elsevierViewall"><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">La inmunosupresión farmacológica de los pacientes trasplantados de órgano solido constituye un importante factor de riesgo tanto para la aparición de queratosis actínicas (QA) como para su progresión a carcinomas escamosos (CE). El tratamiento tanto de las lesiones clínicas como preclínicas en este grupo de pacientes es obligatorio debido a la elevada posibilidad de evolución a CE. Por otra parte, la prevención presenta también un papel importante que debemos tener en cuenta.</p><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Existen un gran número de estudios realizados en pacientes inmunocompetentes sobre el tratamiento y la prevención de QA, pero no en pacientes inmunosuprimidos.</p><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Esta revisión pretende resumir el conocimiento actual sobre los tratamientos y medidas de prevención de la QA en loas pacientes trasplantados de órgano sólido.</p></span>" ] ] "multimedia" => array:1 [ 0 => array:5 [ "identificador" => "fig0005" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => false "mostrarDisplay" => true "figura" => array:1 [ 0 => array:4 [ "imagen" => "fx1.jpeg" "Alto" => 749 "Ancho" => 1333 "Tamanyo" => 82723 ] ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0015" "bibliografiaReferencia" => array:47 [ 0 => array:3 [ "identificador" => "bib0240" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Research gaps in the management and prevention of cutaneous squamous cell carcinoma in organ transplant recipients" "autores" => array:1 [ 0 => array:2 [ "etal" => true "autores" => array:6 [ 0 => "M. 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