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Resumen: Objetivo: Los pacientes diagnosticados de cáncer queratinocítico (carcinoma basocelular y carcinoma epidermoide cutáneo) o cáncer cutáneo no melanoma (CCNM) tienen un riesgo aumentado de desarrollar una segunda neoplasia cutánea. Nuestro objetivo es describir la frecuencia, tasa de incidencia y factores de riesgo predisponentes para desarrollar una segunda neoplasia cutánea en una cohorte de pacientes tratados mediante cirugía micrográfica de Mohs (CMM). Material y métodos: Estudio prospectivo de una cohorte nacional de pacientes incluidos para realización de CMM para tratar CCNM en 22 centros españoles (julio 2013-febrero 2020) REGESMOHS. Las variables analizadas incluyen las características demográficas, la frecuencia de aparición de segundas neoplasias cutáneas, sus tasas de incidencia y factores de riesgo, y se estimaron utilizando un modelo de regresión logístico multivariante de efectos mixtos. Resultados: Fueron intervenidos 4.768 pacientes: 4.397 (92%) carcinomas basocelulares, y 371 (8%) carcinomas epidermoides. El tiempo medio de seguimiento fue de 2,4 años. Se diagnosticó un nuevo tumor durante el seguimiento en 1.201 pacientes (25%); 1.013 (21%) fueron carcinomas basocelulares, 154 (3%) carcinomas epidermoides cutáneos, 20 melanomas (0,4%) La tasa de incidencia fue de 107 (101-113) por 1.000 personas/año para cualquier tumor; 90 (85-96) para el carcinoma basocelular, 14 (12-16) para el carcinoma epidermoide cutáneo y 2 (1-3) para el melanoma. El riesgo de nueva neoplasia fue mayor en varones que en mujeres 738 (61%) vs. 463 (39%). Los factores de riesgo más significativos fueron la historia de múltiples tumores previos al diagnóstico (RR: 4,6; IC 95%: 2,9-7,1); la inmunosupresión (RR: 2,1; IC 95%: 1,4-3,1) y paciente varón (RR: 1,6; IC 95%: 1,4-1,9). Conclusión: Los pacientes diagnosticados de cáncer queratinocítico intervenido mediante cirugía de Mohs tienen un riesgo aumentado de aparición de segundas neoplasias, sobre todo en aquellos pacientes con historia de tumores múltiples al diagnóstico, inmunodeprimidos y varones. Abstract: Objective: Patients with nonmelanoma skin cancer (NMSC)—ie, basal cell carcinoma (BCC) or squamous cell carcinoma (SCC)—have an increased risk of developing a second skin cancer. The aim of this study was to describe the frequency, incidence per 1000 person-years, and predictors of a second skin cancer in a cohort of patients with NMSC treated with Mohs micrographic surgery (MMS). Material and methods: Prospective study of a national cohort of patients with NMSC who underwent MMS at 22 Spanish hospitals between July 2013 and February 2020; case data were recorded in the REGESMOHS registry. The study variables included demographic characteristics, frequency and incidence per 1000 person-years of second skin cancers diagnosed during the study period, and risk factors identified using mixed-effects logistic regression. Results: We analyzed data for 4768 patients who underwent MMS; 4397 (92%) had BCC and 371 (8%) had SCC. Mean follow-up was 2.4 years. Overall, 1201 patients (25%) developed a second skin cancer during follow-up; 1013 of the tumors were BCCs (21%), 154 were SCCs (3%), and 20 were melanomas (0.4%). The incidence was 107 per 1000 person-years (95% CI, 101-113) for any cancer, 90 per 1000 person-years (95% CI, 85-96) for BCC, 14 (95% CI, 12-16) per 1000 person-years for SCC, and 2 (95% CI, 1-3) per 1000 person-years for melanoma. More men than women developed a subsequent skin cancer (738 [61%] vs 463 [39%]). The main risk factors were a history of multiple tumors before diagnosis (relative risk [RR], 4.6; 95% CI, 2.9-7.1), immunosuppression (RR, 2.1; 95% CI, 1.4-3.1), and male sex (RR, 1.6; 95% CI, 1.4-1.9). Conclusion: Patients have an increased risk of developing a second tumor after MMS treatment of NMSC. Risk factors are a history of multiple tumors at diagnosis, immunosuppression, and male sex.

Objective: Patients with nonmelanoma skin cancer (NMSC)—ie, basal cell carcinoma (BCC) or squamous cell carcinoma (SCC)—have an increased risk of developing a second skin cancer. The aim of this study was to describe the frequency, incidence per 1000 person-years, and predictors of a second skin cancer in a cohort of patients with NMSC treated with Mohs micrographic surgery (MMS). Material and methods: Prospective study of a national cohort of patients with NMSC who underwent MMS at 22 Spanish hospitals between July 2013 and February 2020; case data were recorded in the REGESMOHS registry. The study variables included demographic characteristics, frequency and incidence per 1000 person-years of second skin cancers diagnosed during the study period, and risk factors identified using mixed-effects logistic regression. Results: We analyzed data for 4768 patients who underwent MMS; 4397 (92%) had BCC and 371 (8%) had SCC. Mean follow-up was 2.4 years. Overall, 1201 patients (25%) developed a second skin cancer during follow-up; 1013 of the tumors were BCCs (21%), 154 were SCCs (3%), and 20 were melanomas (0.4%). The incidence was 107 per 1000 person-years (95% CI, 101–113) for any cancer, 90 per 1000 person-years (95% CI, 85–96) for BCC, 14 (95% CI, 12–16) per 1000 person-years for SCC, and 2 (95% CI, 1–3) per 1000 person-years for melanoma. More men than women developed a subsequent skin cancer (738 [61%] vs 463 [39%]). The main risk factors were a history of multiple tumors before diagnosis (relative risk [RR], 4.6; 95% CI, 2.9–7.1), immunosuppression (RR, 2.1; 95% CI, 1.4–3.1), and male sex (RR, 1.6; 95% CI, 1.4–1.9). Conclusion: Patients have an increased risk of developing a second tumor after MMS treatment of NMSC. Risk factors are a history of multiple tumors at diagnosis, immunosuppression, and male sex. Resumen: Objetivo: Los pacientes diagnosticados de cáncer queratinocítico (carcinoma basocelular y carcinoma epidermoide cutáneo) o cáncer cutáneo no melanoma (CCNM) tienen un riesgo aumentado de desarrollar una segunda neoplasia cutánea. Nuestro objetivo es describir la frecuencia, la tasa de incidencia y los factores de riesgo predisponentes para desarrollar una segunda neoplasia cutánea en una cohorte de pacientes tratados mediante cirugía micrográfica de Mohs (CMM). Material y métodos: Estudio prospectivo de una cohorte nacional de pacientes incluidos para realización de CMM para tratar CCNM en 22 centros españoles (julio 2013-febrero 2020) REGESMOHS. Las variables analizadas incluyen las características demográficas, la frecuencia de aparición de segundas neoplasias cutáneas, sus tasas de incidencia y los factores de riesgo, y se estimaron utilizando un modelo de regresión logístico multivariante de efectos mixtos. Resultados: Fueron intervenidos 4.768 pacientes: 4.397 (92%) carcinomas basocelulares y 371 (8%) carcinomas epidermoides. El tiempo medio de seguimiento fue de 2,4 años. Se diagnosticó un nuevo tumor durante el seguimiento en 1.201 pacientes (25%); 1.013 (21%) fueron carcinomas basocelulares, 154 (3%) carcinomas epidermoides cutáneos, 20 melanomas (0,4%) La tasa de incidencia fue de 107 (101-113) por 1.000 personas/año para cualquier tumor; 90 (85-96) para el carcinoma basocelular, 14 (12-16) para el carcinoma epidermoide cutáneo y 2 (1-3) para el melanoma. El riesgo de nueva neoplasia fue mayor en varones que en mujeres 738 (61%) vs. 463 (39%). Los factores de riesgo más significativos fueron la historia de múltiples tumores previos al diagnóstico (RR: 4,6; IC 95%: 2,9-7,1); la inmunosupresión (RR: 2,1; IC 95%: 1,4-3,1) y paciente varón (RR: 1,6; IC 95%: 1,4-1,9). Conclusión: Los pacientes diagnosticados de cáncer queratinocítico intervenido mediante cirugía de Mohs tienen un riesgo aumentado de aparición de segundas neoplasias, sobre todo en aquellos pacientes con historia de tumores múltiples al diagnóstico, inmunodeprimidos y varones.

Randomized studies to assess the efficacy of Mohs micrographic surgery in basal cell and squamous cell carcinomas are limited by methodological and ethical issues and a lack of long follow-up periods. This study presents the “real-life” results of a nationwide 7-years cohort on basal cell carcinoma and squamous cell carcinoma treated with Mohs micrographic surgery. A prospective cohort was conducted in 22 Spanish centres (from July 2013 to February 2020) and a multivariate analysis, including characteristics of patients, tumours, surgeries and follow-up, was performed. A total of 4,402 patients followed up for 12,111 patient-years for basal cell carcinoma, and 371 patients with 915 patient-years of follow-up for squamous cell carcinoma were recruited. Risk factors for recurrence included age, non-primary tumours and more stages or unfinished surgeries for both tumours, and immunosuppression for squamous cell carcinoma. Incidence rates of recurrence were 1.3 per 100 person-years for basal cell carcinoma (95% confidence interval 1.1–1.5) and 4.5 for squamous cell carcinoma (95% confidence interval 3.3–6.1), being constant over time (0–5 years). In conclusion, follow-up strategies should be equally intense for at least the first 5 years, with special attention paid to squamous cell carcinoma (especially in immunosuppressed patients), elderly patients, non-primary tumours, and those procedures requiring more stages, or unfinished surgeries.