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Vol. 114. Núm. 3.
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Vol. 114. Núm. 3.
Páginas T255-T256 (marzo 2023)
Resident's Forum
Open Access
RF – Intralesional 5-Fluorouracil in the Treatment of Nonmelanoma Skin Cancer
FR – Tratamiento intralesional del cáncer cutáneo no melanoma con 5-fluorouracilo
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J. Gil-Lianes, D. Morgado-Carrasco
Autor para correspondencia
morgadodaniel8@gmail.com

Corresponding author.
Servicio de Dermatología, Hospital Clínic de Barcelona, Universitat de Barcelona, Barcelona, Spain
Contenido relacionado
Actas Dermosifiliogr. 2023;114:255-610.1016/j.ad.2021.07.029
J. Gil-Lianes, D. Morgado-Carrasco
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Nonmelanoma skin cancer (NMSC) includes cutaneous squamous cell carcinoma (SCC) and basal cell carcinoma (BCC). It is the most common cancer in humans and ranks fifth in terms of economic burden.1,2 The treatment of choice is surgery,3–5 but nonsurgical options can be contemplated in selected cases. Intralesional chemotherapy, for example, has been used off label for more than 50 years. The agents include 5-fluorouracil (5-FU) (Table 1), methotrexate, bleomycin, and interferon-α.3,4

Table 1.

Intralesional Treatment of Nonmelanoma Skin Cancer With 5-Fluorouracil.a

Drug  Mechanism of action  Dose  Administration interval  Complete response rate  Contraindications  Adverse effects 
5-Fluorouracil  Uracil analog DNA and RNA alterations  50mg/mL (0.5–2mL)  4 wkb  BCC >90%SCC: 90%Keratoacanthoma: 76%–98%  Severe liver diseasePregnancy or breastfeeding  Local: pain, erythema, erosion, necrosisSystemic (rare): cytopenia, gastrointestinal effects 

Abbreviations: BCC, basal cell carcinoma; SCC, squamous cell carcinoma.

a

Histologic confirmation is recommended before any nonsurgical treatment.

b

Most tumors (76%) resolved after just 1 injection.

In 2021, Maxfield et al.4 published the largest study to date on the use of intralesional 5-FU in SCC. It was a retrospective cohort study of 148 patients with a median age of 74 years and 172 tumors: 164 invasive SCCs and 8 keratoacanthomas. The most common location was the lower extremities (37%). Between 0.2 and 2mL of 5-FU was injected at a concentration of 50mg/mL into the base of the tumors following the administration of lidocaine 1% and adrenaline 1:100000 to anesthetize the area. In total, 92% of the tumors (158/172) showed a complete response, and just 1 dose was needed in 76% of cases. The remaining 24% required at least 2 doses, generally administered 4 weeks apart. The 14 tumors that did not respond were treated surgically without complications. Just 1 recurrence (keratoacanthoma) was observed after a median follow-up of 9.5 months. None of the patients developed moderate or severe adverse effects.

2021 also saw the publication of a systematic review on the use of intralesional 5-FU in NMSC.5 The authors analyzed 19 studies involving 283 patients. The complete response rate was higher in SCC (87%) and BCC (91.4%) than in keratoacanthoma (74.5%, P=.007), and the times to resolution were similar (9–12 weeks). Previous systematic reviews had shown similar results.1,3 Most of the BCCs were low risk (<15mm, superficial or nodular), although aggressive subtypes (multifocal, recurrent, morpheaform) also responded. In the different studies reviewed, a volume ranging from 0.5 to 2mL (depending on tumor size) was injected at a concentration of 15–25mg/mL, with a mean of 4–8 injections and a cumulative mean dose of 90mg (up to 612mg in recurrent cases). The patients were followed for between 12 and 24 weeks. The most common adverse effects were local, transient reactions (erythema, edema, erosion, ulceration). None of the patients experienced hematologic or systemic adverse effects.1

Although surgery remains the treatment of choice for NMSC, intralesional 5-FU may be an effective, safe, and minimally invasive treatment for patients with a high surgical risk or who have tumors in complex locations or do not wish surgery. Its use as a neoadjuvant agent should be explored in clinical studies.

References
[1]
L. Metterle, C. Nelson, N. Patel.
Intralesional 5-fluorouracil (FU) as a treatment for nonmelanoma skin cancer (NMSC): a review.
J Am Acad Dermatol, 74 (2016), pp. 552-557
[2]
K. Chitwood, J. Etzkorn, G. Cohen.
Topical and intralesional treatment of nonmelanoma skin cancer: efficacy and cost comparisons.
Dermatol Surg, 39 (2013), pp. 1306-1316
[3]
J.S. Kirby, C.J. Miller.
Intralesional chemotherapy for nonmelanoma skin cancer: a practical review.
J Am Acad Dermatol, 63 (2010), pp. 689-702
[4]
L. Maxfield, M. Shah, C. Schwartz, L.S. Tanner, J. Appel.
Intralesional 5-fluorouracil for the treatment of squamous cell carcinomas.
J Am Acad Dermatol, 84 (2021), pp. 1696-1697
[5]
J. Maghfour, D. Kuraitis, A. Murina.
Intralesional 5-fluorouracil for treatment of non-melanoma skin cancer: a systematic review.
J Drugs Dermatol, 20 (2021), pp. 192-198
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