Mohs micrographic surgery: a review of indications, technique, outcomes, and considerations

Comparison of Infection Rate Between Sterile and Nonsterile Gloves During Mohs Micrographic Surgery: An Updated Systematic Review and Meta-Analysis

BACKGROUND

Mohs micrographic surgery (MMS) is a well-established technique for the removal of various types of skin cancers. While sterile gloves (SG) are commonly used in skin surgeries such as MMS, additional understanding of their effectiveness compared to nonsterile gloves (NSG) in preventing local infection is required.

OBJECTIVE

We aimed to perform an updated systematic review and meta-analysis comparing the use of SG with NSG for local infection rate post-MMS and point out cost discrepancies between these 2 scenarios.

METHODS

We searched MEDLINE, Embase, and Cochrane for studies published up to August 2023 comparing the use of SG with NSG during MMS that reported the outcome of wound infection.

RESULTS

A total of 4 studies with 10,644 MMS were included, of which 7512 (70.6%) were performed with SG and 3132 (29.4%) were done with NSG. In the SG group, 232 out of 7512 cases (3.1%) developed infection compared to 64 out of 3132 (2.0%) in the NSG group [odds ratio (OR) 1.14; 95% confidence interval (CI) 0.85-1.52; P = .39; I2 = 0%]. Therefore, the post-MMS infection rates were not significantly different between SG and NSG groups, including in the excision (OR 0.92; 95% CI 0.48-1.79; P = .81; I2 = 0%) and reconstruction (OR 1.17; 95% CI 0.85-1.60; P = .34; I2 = 0%) subanalysis. Regarding the mean cost of the gloves, the NSG pair was $0.24, approximately 10% of the price of the SG pair ($2.27).

CONCLUSION

The results support that, compared to SG, NSG are equally effective in preventing infections during MMS while offering significant cost savings without compromising patient outcomes.Protocol registration: PROSPERO, CRD42023458525.

Prophylactic Antibiotic Use in Reconstruction of Nasal Mohs Defects

OBJECTIVE

To evaluate the effect of prophylactic antibiotics on outcomes and complications following surgical reconstructions of nasal Mohs defects in the outpatient setting.

STUDY DESIGN

Retrospective cohort study.

SETTING

Single tertiary care center, July 2021 to June 2023.

METHODS

All adult patients who underwent reconstruction of nasal Mohs defects in an outpatient office setting were examined. Patient demographics, surgical details, prophylactic postprocedural antibiotic use, and postprocedural complications (infection, flap or graft necrosis, wound dehiscence) were collected. Outcomes and complications were compared between patients who received and did not receive prophylactic antibiotics using χ2, Kruskal-Wallis, and multivariable logistic regression.

RESULTS

A total of 211 patients met inclusion criteria. A majority of reconstructions utilized a local flap (70%), followed by a skin or composite graft (22%), then an interpolated flap (8%). Over half of patients (55%) were prescribed prophylactic antibiotics. Postprocedural complications were documented in 16 patients (7.6%), including infection (3.3%) and flap or graft loss or necrosis (1.4%). The rate of complications did not differ based on receipt of antibiotics. The only factors independently associated with the development of complications were history of chemoradiation and reconstruction with skin or composite grafts.

CONCLUSION

Prophylactic antibiotics after nasal Mohs reconstructions performed in the office setting were not associated with any differences in the rate of postprocedural complications, including surgical site infections.

3D models for mohs micrographic surgery: a review on its use in patient education

The use of a 3D model for patient education has shown encouraging results in surgical specialties like plastic surgery and neurosurgery, amongst many others; however, there is limited research on the clinical application of 3D models for Mohs Micrographic Surgery. This study delves into the utilization of 3D models for patient education in Mohs Surgery by juxtaposing different 3D modalities, highlighting their differences, and exploring potential avenues for future integration of 3D models into clinical practice. A literature search in the scientific database MEDLINE through PubMed and OVID and on the ProQuest Health & Medical Collection database was performed on the use of a 3D model for patient education. We limited the search to articles available in English and considered those mentioning the educational use of 3D models, especially for patient education, after excluding duplicate titles. We did not exclude articles based on publication year due to limited availability of literature. Utilizing 3D models for patient education within the framework of Mohs Micrographic surgery, including a 3D multicolored clay model and a 3D model accompanied by an educational video intervention, presents substantial advantages. 3D models offer a visual and tactile means to improve patients' comprehension of the Mohs procedure, the affected area, and possible outcomes. They hold the potential to reduce patient anxiety and improve decision-making. Currently, literature on the use of 3D models for patient education in Mohs Micrographic Surgery is limited, warranting further research in this area.

Mohs Micrographic Surgery for Invasive Melanoma Allows for Tissue Preservation Compared With Wide Local Excision: A Retrospective Cohort Study

BACKGROUND

While increasing evidence supports the safety and effectiveness of immunohistochemistry-assisted Mohs micrographic surgery (MMS) for superficially invasive melanoma, there is a paucity of the literature investigating its effect on final defect size.

OBJECTIVE

To evaluate the tissue sparing effect of MMS for melanoma.

MATERIALS AND METHODS

Three hundred and twenty-eight patients with early-stage (T1a/T1b) cutaneous melanomas treated with MMS from January 2008 to December 2018 were evaluated. Measured defect sizes after Mohs tumor extirpation were compared with anticipated defect size that would result from standard-margin wide local excision (WLE). Average actual versus anticipated defect areas were compared using a paired t-test (95% confidence intervals).

RESULTS

The following groups demonstrated a significantly smaller defect area for MMS-treated tumors when compared with anticipated standard-margin WLE defect: All tumors combined (13.8 cm2 vs 10.4 cm2, p < .001), tumors requiring 1 stage (13.6 cm2 vs 10.1 cm2,p < .001), and tumors requiring 2 stages (13.2 cm2 vs 10.5 cm2, p = .004). The majority of patients (83.5%, n = 274) achieved clear margins with 1 stage.

CONCLUSION

Immunohistochemistry-assisted MMS for early-stage invasive melanoma is associated with smaller final defect size and overall tissue sparing effect compared with standard WLE margins.

Efficacy of micrographic surgery versus conventional excision in reducing recurrence for basal cell carcinoma and squamous cell carcinoma: A systematic review and meta-analysis

The standard of care for basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) involves excision by conventional surgery (CS) with a predefined safety margin of resection or micrographic surgery (MS) with microscopic margin control. Previous studies have reported the superiority of MS in reducing recurrences for high-risk BCC and SCC. This systematic review aimed to assess MS and CS recurrence rates by including randomized clinical trials (RCTs) and cohort studies. A systematic review and meta-analysis were conducted for related studies in PubMed, LILACS, Embase, Scopus, Web of Science, CINHAL and Cochrane until May 2023. RCTs and cohorts involving patients with BCC or SCC submitted to MS and CS were included. Risk of bias assessment followed Cochrane-recommended tools for RCTs and cohorts, and certainty of evidence followed the GRADE approach. Pooled estimates were used to determine the relative risk (RR) and absolute risk difference (RD) using a random-effects model. Seventeen studies were included, two RCTs and fifteen cohorts. There were 82 recurrences in 3050 tumours submitted to MS, with an overall recurrence rate of 3.1% (95% CI 2.0%-4.7%). For CS, there were 209 recurrences in 3453 tumours, with a recurrence rate of 5.3% (95% CI 2.9%-9.3%). The combined estimate of RR was 0.48 (95% CI 0.36-0.63), without heterogeneity nor evidence of publication bias (p > 0.3). The RD resulted in 2.9% (95% CI 1.0%-4.9%; NNT = 35). Regarding subgroup analysis, the RR for BBC was 0.37 (95% CI 0.25-0.54), and RD was 3.7% (95% CI 0.8%-6.5%; NNT = 28). For SCC, RR was 0.57 (95% CI 0.29-1.13), and RD was 1.9% (95% CI 0.8%-4.7%; NNT = 53). Among primary tumours, RR was 0.39 (95% CI 0.28-0.54), and for recurrent tumours was 0.67 (95% CI 0.30-1.50). There is moderate evidence based on two RCTs, and low evidence based on 15 cohort studies that MS is superior to CS in reducing recurrences of BCCs and primary tumours. The development of protocols that maximize the cost-effectiveness of each method in different clinical scenarios is paramount.

5-Year Follow-Up of a Physician Performance Feedback Report Intervention to Reduce Overuse and Excess Cost: A National Cohort Study

BACKGROUND

Mohs micrographic surgery efficiently treats skin cancer through staged resection, but surgeons' varying resection rates may lead to higher medical costs.

OBJECTIVE

To evaluate the cost savings associated with a quality improvement.

MATERIALS AND METHODS

The authors conducted a retrospective cohort study using 100% Medicare fee-for-service claims data to identify the change of mean stages per case for head/neck (HN) and trunk/extremity (TE) lesions before and after the quality improvement intervention from 2016 to 2021. They evaluated surgeon-level change in mean stages per case between the intervention and control groups, as well as the cost savings to Medicare over the same time period.

RESULTS

A total of 2,014 surgeons performed Mohs procedures on HN lesions. Among outlier surgeons who were notified, 31 surgeons (94%) for HN and 24 surgeons (89%) for TE reduced their mean stages per case with a median reduction of 0.16 and 0.21 stages, respectively. Reductions were also observed among outlier surgeons who were not notified, reducing their mean stages per case by 0.1 and 0.15 stages, respectively. The associated total 5-year savings after the intervention was 92 million USD.

CONCLUSION

The implementation of this physician-led benchmarking model was associated with broad reductions of physician utilization and significant cost savings.

Review on the Role of Paraffin-embedded Margin-controlled Mohs Micrographic Surgery to Treat Skin Tumors

Paraffin-embedded margin-controlled Mohs micrographic surgery (PMMS) includes various procedures such as slow Mohs or deferred Mohs technique, the Muffin and Tübingen techniques, and staged margin excision, or the spaghetti technique. PMMS is a variation of conventional Mohs micrographic surgery (MMS) that allows histopathological examination with delayed margin control. PMMS requires minimum training and may be adopted by any hospital. The setback is that PMMS can require procedures across multiple days. PMMS lowers the rate of recurrence of basal cell carcinoma vs wide local excision in high-risk basal cell carcinoma, and improves the rates of recurrence and survival in lentigo maligna. PMMS can be very useful in high-risk squamous cell carcinoma treatment. Finally, it is a promising technique to treat infrequent skin neoplasms, such as dermatofibrosarcoma protuberans, or extramammary Paget's disease, among others. In this article, we present a literature narrative review on PMMS, describing techniques and indications, and highlighting long-term outcomes.

Review on the Role of Paraffin-embedded Margin-controlled Mohs Micrographic Surgery to Treat Skin Tumors

Paraffin-embedded margin-controlled Mohs micrographic surgery (PMMS) includes various procedures such as slow Mohs or deferred Mohs technique, the Muffin and Tübingen techniques, and staged margin excision, or the spaghetti technique. PMMS is a variation of conventional Mohs micrographic surgery (MMS) that allows histopathological examination with delayed margin control. PMMS requires minimum training and may be adopted by any hospital. The setback is that PMMS can require procedures across multiple days. PMMS lowers the rate of recurrence of basal cell carcinoma vs wide local excision in high-risk basal cell carcinoma, and improves the rates of recurrence and survival in lentigo maligna. PMMS can be very useful in high-risk squamous cell carcinoma treatment. Finally, it is a promising technique to treat infrequent skin neoplasms, such as dermatofibrosarcoma protuberans, or extramammary Paget's disease, among others. In this article, we present a literature narrative review on PMMS, describing techniques and indications, and highlighting long-term outcomes.

Management of post-Mohs surgical wounds with a hypothermically stored amniotic membrane: a case series

OBJECTIVE

The aim of this case series is to present an alternative approach to managing post-Mohs Micrographic Surgery (Mohs) wounds with hypothermically stored amniotic membrane (HSAM).

METHOD

A case series of patients with post-Mohs wounds is presented, with four patients referred for hard-to-heal wounds following a Mohs procedure that was performed 1-3 months previously. All wounds underwent weekly assessment, debridement, and application of HSAM and secondary dressings. Treatment also included management of bioburden, proper skin care and compression therapy for lower extremity wounds.

RESULTS

This case series of seven wounds consisted of four females and three males with a mean age of 87.6 years. Mean wound size at first application of HSAM was 1.34±1.20cm2. All wounds closed, with an average time to wound closure of 43.7±27.1 days. Patients received an average of 4.6±2.5 HSAM applications. The four post-Mohs wounds with a history of being hard-to-heal had an average time to wound closure of 35.5±16.3 days, with an average duration of 86.5±32.4 days prior to the first HSAM application.

CONCLUSION

The results of this case series suggest that use of HSAM may provide an alternative approach to managing post-Mohs wounds. In addition, these findings suggest that HSAM may be of greatest benefit when applied early after Mohs surgery.

Lentigo Maligna Treatment-An Update

Lentigo maligna (LM) is a melanoma in situ that is prevalent in chronically sun-damaged skin. Characterized by a slow growth pattern and high mutation rates due to chronic UV exposure, LM poses diagnostic and therapeutic challenges, particularly given its tendency to mimic other skin lesions and its occurrence in cosmetically sensitive areas. Its diagnosis is based on an integrated approach using dermoscopy and reflectance confocal microscopy (RCM). Despite its slow progression, LM can evolve into lentigo maligna melanoma (LMM), making its treatment necessary. Treatment modalities encompass both surgical and non-surgical methods. Surgical treatments like Wide Local Excision (WLE) and Mohs Micrographic Surgery (MMS) aim for clear histological margins. WLE, a standard melanoma surgery, faces challenges from LM's subclinical extensions, which increase the recurrence risk. MMS, effective for large or poorly defined lesions, is defined by precise margin control while considering cosmetic outcomes. Non-surgical options, including radiotherapy and imiquimod, are alternatives for non-surgical candidates. Radiotherapy has been effective since the 1950s, offering good control and cosmetic results, especially for older patients. Imiquimod, an immunomodulator, shows promise in treating LM, though its application remains off-label. The increasing incidence of LM/LMM necessitates a balance in treatment choices to minimize recurrence and maintain cosmetic integrity. A multidisciplinary approach, integrating clinical examination with dermoscopy and RCM and histological assessment, is essential for accurate diagnosis and effective LM management.

Laser Applications in Wound and Scar Management Post-Mohs Micrographic Surgery: A Systematic Review

Mohs micrographic surgery (MMS) can lead to complications such as scarring and delayed wound healing, particularly in sensitive areas such as the face, neck, and chest. This study aims to assess the evidence regarding the use of lasers post-MMS for wound healing and scar revision. A comprehensive systematic review of the literature was performed using databases including MEDLINE, PubMed, EMBASE, Web of Science, Cochrane Library, and CINAHL from inception until July 25, 2022. A total of 2147 unique studies were identified, from which 17 were included in the analysis. A total of 17 studies reported applications of lasers with favourable efficacy including wound healing (n = 1), resurfacing of full-thickness skin grafts and split-thickness skin grafts (n = 4), periscar telangiectasias (n = 1), functional scar contractures (n = 2), and scar texture (n = 9). Minimal adverse effects were reported with the use of lasers post-MMS. Overall, the use of lasers post-MMS is a safe and well-tolerated option for scar revision with high patient satisfaction and is less invasive than surgical interventions.

Bibliometric evaluation of Anais Brasileiros de Dermatologia (2013-2022)

The Anais Brasileiros de Dermatologia, published since 1925, is the most influential dermatological journal in Latin America, indexed in the main international bibliographic databases, and occupies the 50th position among the 70 dermatological journals indexed in the Journal of Citations Reports, in 2022. In this article, the authors present a critical analysis of its trajectory in the last decade and compare its main bibliometric indices with Brazilian medical and international dermatological journals. The journal showed consistent growth in different bibliometric indices, which indicates a successful editorial policy and greater visibility in the international scientific community, attracting foreign authors. The increases in citations received (4.1×) and in the Article Influence Score (2.9×) were more prominent than those of the main Brazilian medical and international dermatological journals. The success of Anais Brasileiros de Dermatologia in the international scientific scenario depends on an assertive editorial policy, on promptly publication of high-quality articles, and on institutional stimulus to encourage clinical research in dermatology.

Photodynamic Therapy in Treating a Subset of Basal Cell Carcinoma: Strengths, Shortcomings, Comparisons with Surgical Modalities, and Potential Role as Adjunctive Therapy

Basal cell carcinoma (BCC) is the most common skin cancer, for which there are multiple treatment options, including the gold standard Mohs micrographic surgery (MMS), surgical excision, electrodesiccation and curettage, radiation therapy, cryosurgery, and photodynamic therapy (PDT). While PDT is currently approved for treating actinic keratosis, it has been used off-label to treat BCC patients who may not tolerate surgery or other treatment modalities. We present a review of the efficacy of these modalities and describe important considerations that affect the usage of PDT and MMS. ALA-PDT and MAL-PDT are both efficacious treatment options for lower-risk BCC that can serve as non-invasive alternatives to surgical excision with favorable cosmetic outcomes in patients unsuitable to undergo surgery. In particular, PDT may be considered an adjuvant for the prevention and treatment of BCC lesions in patients with some genetic syndromes such as Gorlin syndrome, and in combination with surgical excision in lesions presenting in certain locations. Limitations to PDT include lack of margin control to prevent recurrence, pain, and cost of certain photosensitizers. Future studies should investigate the role of PDT as adjunctive therapy, standardization of protocols, and causes and ways to address recurrence following PDT treatment.

Salvage re-irradiation in non-melanoma skin cancers: A multicenter analysis

BACKGROUND AND PURPOSE

We conducted a multicentre real-world study to assess the outcomes of radical salvage re-irradiation for non-melanoma skin cancer (nMSC) recurrences following definitive or postoperative radiotherapy.

MATERIALS AND METHODS

Data on patients treated between 2006 and 2022 with re-irradiation for nMSCs were retrospectively collected from five high-volume brachytherapy centers. The primary endpoint was local control (LC). Secondary endpoints included overall survival, progression-free survival, and adverse events (AEs). The Kaplan-Meier estimator and Cox Proportional-Hazards Model were utilised in the analysis.

RESULTS

A total of 58 patients with a median age of 78.4 years with recurrences of previously irradiated nMSC in the head and neck region were included in the analysis. The majority had cutaneous basal cell carcinoma (BCC; 91.4%), and were irradiated with high-dose-rate brachytherapy (HDR-BT; 91.4%). The most common locations included the nasal region (36.2%) and external ear (18.9%). The 1-year LC was 73.1% and decreased to 41.7% at three years. The size of the re-irradiated lesion was the single independent prognostic factor in Cox analysis (per mm; HR 1.07; 95% CI 1.04-1.11; p < 0.001). Grade 3 or worse AEs were reported in 7 cases (12.1%).

CONCLUSION

Re-irradiation for nMSCs, predominantly administered with brachytherapy for radiorecurrent BCC, is associated with high recurrence rates, and the risk of failure significantly increases with the size of the treated lesion. Re-irradiation could be an option for selected elderly patients with small, localised, inoperable recurrences after RT to achieve local control or defer systemic treatment; however, prospective trials are necessary to confirm its safety and efficacy.

Nanotechnology-empowered strategies in treatment of skin cancer

In current scenario skin cancer is a serious condition that has a significant impact on world health. Skin cancer is divided into two categories: melanoma skin cancer (MSC) and non-melanoma skin cancer (NMSC). Because of its significant psychosocial effects and need for significant investment in new technology and therapies, skin cancer is an illness of global health relevance. From the patient's perspective chemotherapy considered to be the most acceptable form of treatment. However, significant negatives of chemotherapy such as severe toxicities and drug resistance pose serious challenges to the treatment. The field of nanomedicine holds significant promise for enhancing the specificity of targeting neoplastic cells through the facilitation of targeted drug delivery to tumour cells. The integration of multiple therapeutic modalities to selectively address cancer-promoting or cell-maintaining pathways constitutes a fundamental aspect of cancer treatment. The use of mono-therapy remains prevalent in the treatment of various types of cancer, it is widely acknowledged in the academic community that this conventional approach is generally considered to be less efficacious compared to the combination treatment strategy. The employment of combination therapy in cancer treatment has become increasingly widespread due to its ability to produce synergistic anticancer effects, mitigate toxicity associated with drugs, and inhibit multi-drug resistance by means of diverse mechanisms. Nanotechnology based combination therapy represents a promising avenue for the development of efficacious therapies for skin cancer within the context of this endeavour. The objective of this article is to provide a description of distinct challenges for efficient delivery of drugs via skin. This article also provides a summary of the various nanotechnology based combinatorial therapy available for skin cancer with their recent advances. This review also focuses on current status of clinical trials of such therapies.

Issues in the surgical management of skin squamous cell cancers in albinos-experience of two surgical oncology units in Burkina Faso

BACKGROUND AND OBJECTIVES

Skin cancers in albinos are frequent in sunny countries. The surgeon plays a crucial role in their treatment. The objective was to describe the challenges of surgical management of skin cancer in albinos.

METHODS

Retrospective, descriptive, and multicenter study on skin cancer surgery in albinos performed over the past 14 years in Ouagadougou. We were interested in surgery indications, techniques, and results. Survival was assessed using the Kaplan-Meier method. Comparisons of proportions were made by Student's t-test.

RESULTS

The cancers were multiple synchronous in 41.3%. We identified 46 albinos with 71 skin cancers. Surgery was performed in 93%. Lesions were located on the back, upper limbs, and head and face in 40.9%, 30.3%, and 16.7%, respectively. Precancerous lesions were treated concomitantly in 23.6%. The surgery consisted of a lumpectomy. Direct suturing and mobilization of flaps allowed skin coverage in 17.9% and 34.3%, respectively. Lymph node dissection was associated with the limbs in 73.1% of localizations. The average number of lymph nodes removed was 11, with extremes of 7 and 14. Node invasion was noted in 16 out of 19 cases. The resection margins were invaded in 7.5% and required surgical revision. Recurrences were noted in 8.9% of cases. Overall 2-year survival rate was 55.8%.

CONCLUSIONS

Surgery must meet the triple challenge of treating single or multiple synchronous cancers, precancerous lesions, and allowing good healing. Early diagnosis would reduce the rate of secondary healing and improve survival. The absence of extemporaneous histology and the large size of the tumors associated with the delay in diagnosis meant that surgery, whenever possible, was limited to wide and deep resection, to ensure healthy margins.

Wound Care Adherence in Mohs Micrographic Surgery: A Prospective Cohort Study

BACKGROUND

Patients undergoing Mohs micrographic surgery (MMS) are given detailed wound care instructions to prevent postoperative complications. Previous studies have revealed low treatment adherence in general dermatology, but adherence to postoperative wound care and its potential association with poor surgical outcomes remain largely unstudied.

OBJECTIVE

To determine the frequency and causes of wound care nonadherence in patients who underwent MMS.

MATERIALS AND METHODS

A questionnaire containing a modified Eight-Item Morisky Medication Adherence Measure Scale was administered to Mohs patients at their 1 to 2 weeks postoperative visit.

RESULTS

Sixty-three patients were solicited and consented to completing the questionnaire. The average modified Eight-Item Morisky Medication Adherence Measure Scale score was 7.4 of 8, indicating high adherence. Old age and wound care assistance were associated with increased adherence. Factors contributing to nonadherence included feeling well, being too busy, wound care causing discomfort, and being with friends or family. One patient (1.6%) with high adherence developed an epidermal inclusion cyst within the scar. No other complications were observed.

CONCLUSION

Most MMS patients demonstrated high adherence to wound care instructions, and nonadherence was not associated with postoperative complications.

Review of sociodemographic risk factors for presentation with advanced non-melanoma skin cancer

PURPOSE

Non-melanoma skin cancers (NMSC) are often localized and associated with an excellent prognosis but a minority present with locally advanced or metastatic disease requiring extensive resection or systemic treatment. Medical factors that increase the risk of advanced skin cancers such as tobacco use, systemic immunosuppression or genetic syndromes have been described but the sociodemographic risk factors are relatively uninvestigated and under reported. In this review a cohort of patients presenting with periorbital NMSC is reviewed for social determinants of health correlated with presentation with advanced disease.

METHODS

Patients presenting with periorbital NMSC during a 10-year period are categorized as advanced (those tumors requiring extensive local resection, sacrifice of the globe or systemic therapy) or non-advanced and demographic features are compared between the two groups.

RESULTS

274 cases of periorbital NMSC were classified as either non-advanced (177) or advanced (97). Patients with public safety net health insurance were twice as likely to present with advanced disease (25% vs 13%). Patients with advanced disease were significantly less likely to be under the care of a primary care physician, lived in economically depressed areas with lower mean household incomes, and lived further from tertiary medical care.

CONCLUSION

Financial and sociodemographic features are strongly associated with presentation with advanced NMSC. Further work is needed to determine which sociodemographic features are independent risk factors. A better understanding of the relevant barriers to care may reduce the burden of advanced disease at presentation in the future.

Survival Outcomes of Mohs Surgery versus Wide Local Excision for Less Common Nonmelanoma Skin Cancers: A Stabilized Inverse Probability of Treatment Weighting Analysis

BACKGROUND

Compared with wide local excision (WLE), Mohs micrographic surgery (MMS) can not only remove the tumor tissue but also ensure a negative margin. However, there is limited evidence on whether there is a difference in prognosis between the two techniques for less common nonmelanoma skin cancers (NMSCs).

OBJECTIVES

The aim of our study was to compare the survival outcomes of MMS and WLE for less common NMSCs.

METHODS

This study retrospectively analyzed data from the Surveillance, Epidemiology, and End Results dataset between 2003 and 2018. The less common NMSCs include Merkel cell carcinoma, skin appendage neoplasm, fibromatous malignancy, and other rare NMSCs. The stabilized inverse probability of treatment weighting (SIPTW) and the Kaplan-Meier methods were adopted to assess the overall survival (OS) and cancer-specific survival (CSS). Furthermore, the Cox proportional hazards, Fine-and-Gray regression analysis, and subgroup analysis models were applied to examine the effects of MMS versus WLE based on all-cause and cancer-specific mortality.

RESULTS

We identified 6,582 individuals with less common NMSCs for survival analysis, among which 1,946 patients (29.5%) had undergone MMS and 4,636 (70.5%) had received WLE. Diseases diagnosed in the most recent year, older age, the White race, married status, eyelid/face site, small tumor size, and localized disease were factors significantly associated with MMS treatment. Compared with the WLE group, the MMS group had comparable OS before and after the SIPTW analysis. Additionally, after adjusting for other confounding covariates, the surgery type (WLE vs. MMS) did not show significant associations with all-cause mortality (hazard ratio [HR]: 1.03, 95% confidence interval [CI]: 0.94-1.14, p = 0.517) and disease-specific mortality (HR: 1.16, 95% CI: 0.95-1.42, p = 0.134). Moreover, the subgroup analysis validated these findings.

CONCLUSION

MMS and WLE have comparable OS and CSS for less common NMSCs.

The effectiveness and safety of eyelid defect reconstruction after sebaceous carcinoma of the eyelid surgery: A protocol for systematic review and meta-analysis

INTRODUCTION

Sebaceous carcinoma of the eyelid is the third most common eyelid malignancy, after basal cell carcinoma and squamous cell carcinoma. It is highly malignant and potentially aggressive. Surgical excision is currently the best treatment option for this condition. Patients often require reconstruction surgery to repair eyelid defects to achieve normal eyelid function and appearance. However, no comprehensive systematic review has assessed the efficacy and safety of eyelid defect reconstruction. This protocol was developed to conduct a systematic review and meta-analysis to evaluate evidence related to the efficacy and safety of reconstruction.

METHODS

We will systematically search the Cochrane Library, PubMed, Web of Science, China National Knowledge Infrastructure, WanFang Database, and Chinese Biomedical Literature Database from their inception to February 2023 for studies on eyelid defect reconstruction. We will identify other potential studies using multiple methods such as manual searching. The outcomes were eyelid function, eyelid morphology, patient satisfaction, recurrence rate, metastasis rate, tumor-related mortality, and adverse events. Two researchers will independently screen titles and abstracts, identify full-text studies for inclusion, extract data, and appraise the risk of bias in the included studies. A meta-analysis will be conducted using Review Manager 5.4 and R software. The certainty of evidence will be appraised by grading of recommendations, assessment, development, and evaluation system.

RESULTS

This full-text will adhere to the preferred reporting items for systematic reviews and meta-analyses statement to ensure clarity and completeness of reporting in all phases of the systematic review.

DISCUSSION

This study provides evidence of the efficacy and safety of reconstruction methods for sebaceous carcinoma of the eyelid.

Mohs micrographic surgery for keratinocyte carcinomas: clinicopathological predictors of the number of stages

Background

The number of Mohs stages needed to remove a keratinocyte carcinoma affects resource use, expenses, and repair complexity. This study aimed to identify clinicopathological predictors associated with increased or decreased stages and areas for further research.

Methods

A retrospective review was conducted from a single private practice with two Mohs surgeons of 2788 consecutive Mohs cases between January 2017 and December 2021, analyzing the average number of stages taken versus national norms (P = 0.21) and subgroups using unpaired t tests (*<0.05).

Results

Several tumor features were significantly associated with fewer stages: squamous cell carcinomas, Mohs appropriate use criteria score of 7 or 8, preoperative size <0.25 cm2, tumors on the lips and extremities (including hands/fingers), and smoking. Clinicopathological features significantly associated with more stages included Mohs appropriate use criteria score of 9, recurrent skin cancers, basal cell carcinomas, tumor size of 2.25-3.99 cm2, cancers on ears, solid organ transplant patients, treatment delays >180 days, and patients ≥90 years old.

Conclusions

Significant predictors exist for both increased and decreased numbers of Mohs micrographic surgery stages required to eradicate a tumor, which may help Mohs surgeons facilitate, plan, and allocate resources more effectively. Areas for further research in Mohs micrographic surgery are identified.

A retrospective review of Mohs micrographic surgery trends over more than 10 years in Saudi Arabia

OBJECTIVES

To review Mohs micrographic surgery (MMS) trends in Saudi Arabia.Mohs micrographic surgery is a precise surgical technique that has been proven to have the highest cure rate with maximum normal tissue preservation. It is the treatment of choice for non-melanoma skin cancer (NMSC), especially the aggressive histopathological forms, and tumors located in high-risk regions or where tissue preservation is a mandate.

METHODS

A multicentric retrospective study was performed on patients who underwent MMS between January 2010 and September 2022. The information was extracted from the database of King Saud University Medical City and Prince Sultan Military Medical City in Saudi Arabia.

RESULTS

A total of 70 participants were enrolled in this study. Two-thirds (67%) of the tumors that were treated using MMS were basal-cell carcinomas (BCC), 18.6% were squamous cell carcinomas (SCC), 5.7% were sebaceous carcinoma, 4.3% were dermatofibrosarcoma protuberans (DFSP), and 1.4% were rare tumors such as primary mucinous carcinoma. The most common type of reconstruction used to repair post-MMS defect was primary closure in more than half of the patients followed by secondary intention healing (20%). There were no side effects apart from a hematoma in one patient and wound infection in two patients.

CONCLUSION

Although MMS is still generally underutilized in Saudi Arabia, its use has increased in the last decade.

Adequacy of surgical margins, re-excision, and evaluation of factors associated with recurrence: a retrospective study of 769 basal cell carcinomas

BACKGROUND

Achieving adequate surgical margins and preventing recurrence are important in the treatment of basal cell carcinoma (BCC).

OBJECTIVES

The objectives of this study were to evaluate the adequacy of surgical margins and the re-excision rates in patients with primary BCC who underwent standard surgical treatment using our proposed algorithm and to define the risk factors in patients with recurrent BCC.

METHODS

The medical records of patients who were histopathologically diagnosed with BCC were reviewed. An algorithm created based on previous literature was used to determine the distribution of optimal surgical margins adequacy and re-excision rates.

RESULTS

Statistically significant differences were observed between the cases with and without recurrence in age at diagnosis (p=0.004), tumor size (p=0.023), tumor location in the H zone of the face (p=0.005), and aggressive histopathological subtype (p=0.000). When the tumors were evaluated for adequacy of deep and lateral surgical margins and re-excision rates, higher rates of adequate excision (457 cases, 68.0%) and re-excision (43 cases, 33.9%) were noted for tumors in the H or M zone.

STUDY LIMITATIONS

Inadequate follow-up of newly diagnosed patients in terms of recurrence and metastasis and the retrospective application of our proposed algorithm are the limitations of the present study.

CONCLUSIONS

Our results showed that if BCC was detected at an early age and at an early stage, recurrence was lower. The H and M zones were the regions with the highest rates of optimal surgical outcomes.

Repairing Small Facial Soft Tissue Defects by Tissue Regeneration in Asians

BACKGROUND

A variety of options are available to repair the small facial soft tissue defects after surgical removal of cutaneous tumor, including direct suture, skin grafts, local, regional or free flaps. However, tissue regeneration is another option for repairing facial defects. This study proposes the clinical application of the principle of tissue regeneration priority in small defects (diameter <1.3 cm) of facial soft tissue.

METHODS

A retrospective study of 33 patients whose facial defects were repaired by tissue regeneration healing in situ from January 2019 to January 2022. In this group, the facial soft tissue defects were treated with wound moist theory in order to promote wound regeneration.

RESULT

All patients underwent 1 month follow-up at least and the longest follow-up time was 6 months. Hundred percent of the patients were satisfied with their cosmetic outcome. Only some patients formed small depression scars after surgery, the appearance of which were similar to acne scar. In this situation, re-resection and laser treatment could be used as complementary procedures. However, no patient underwent the secondary treatments including laser and re-resection.

CONCLUSION

Healing by tissue regeneration is an effective option for the facial defects in Asians. For most of the small soft tissue defects of the face, tissue regeneration in situ can achieve satisfactory effects. More importantly, it has the advantages of simple operation and fewer complications.

Advancements in nanoparticle-based treatment approaches for skin cancer therapy

Skin cancer has emerged as the fifth most commonly reported cancer in the world, causing a burden on global health and the economy. The enormously rising environmental changes, industrialization, and genetic modification have further exacerbated skin cancer statistics. Current treatment modalities such as surgery, radiotherapy, conventional chemotherapy, targeted therapy, and immunotherapy are facing several issues related to cost, toxicity, and bioavailability thereby leading to declined anti-skin cancer therapeutic efficacy and poor patient compliance. In the context of overcoming this limitation, several nanotechnological advancements have been witnessed so far. Among various nanomaterials, nanoparticles have endowed exorbitant advantages by acting as both therapeutic agents and drug carriers for the remarkable treatment of skin cancer. The small size and large surface area to volume ratio of nanoparticles escalate the skin tumor uptake through their leaky vasculature resulting in enhanced therapeutic efficacy. In this context, the present review provides up to date information about different types and pathology of skin cancer, followed by their current treatment modalities and associated drawbacks. Furthermore, it meticulously discusses the role of numerous inorganic, polymer, and lipid-based nanoparticles in skin cancer therapy with subsequent descriptions of their patents and clinical trials.

Skin substitutes for the management of mohs micrographic surgery wounds: a systematic review

The data on skin substitute usage for managing Mohs micrographic surgery (MMS) wounds remain limited. This systematic review aimed to provide an overview of skin substitutes employed for MMS reconstruction, summarize clinical characteristics of patients undergoing skin substitute-based repair after MMS, and identify advantages and limitations of skin substitute implementation. A systematic review of Ovid MEDLINE, EMBASE, Cochrane Library, and Web of Science databases, from inception to April 7, 2021, identified all cases of MMS defects repaired using skin substitutes. A total of 687 patients were included. The mean patient age was 70 years (range: 6-98 years). Commonly used skin substitutes were porcine collagen (n = 397), bovine collagen (n = 78), Integra (n = 53), Hyalofill (n = 43), amnion/chorion-derived grafts (n = 40), and allogeneic epidermal-dermal composite grafts (n = 35). Common factors influencing skin substitute selection were cost, healing efficacy, cosmetic outcome, patient comfort, and ease of use. Some articles did not specify patient and wound characteristics. Skin substitute usage in MMS reconstruction is not well-guided. Blinded randomized control trials comparing the efficacy of skin substitutes and traditional repair methods are imperative for establishing evidence-based guidelines on skin substitute usage following MMS.

Modulation of Hedgehog Signaling for the Treatment of Basal Cell Carcinoma and the Development of Preclinical Models

Basal Cell Carcinoma (BCC) is the most commonly diagnosed cancer worldwide. While the survivability of BCC is high, many patients are excluded from clinically available treatments due to health risks or personal choice. Further, patients with advanced or metastatic disease have severely limited treatment options. The dysregulation of the Hedgehog (Hh) signaling cascade drives onset and progression of BCC. As such, the modulation of this pathway has driven advancements in BCC research. In this review, we focus firstly on inhibitors that target the Hh pathway as chemotherapeutics against BCC. Two therapies targeting Hh signaling have been made clinically available for BCC patients, but these treatments suffer from limited initial efficacy and a high rate of chemoresistant tumor recurrence. Herein, we describe more recent developments of chemical scaffolds that have been designed to hopefully improve upon the available therapeutics. We secondly discuss the history and recent efforts involving modulation of the Hh genome as a method of producing in vivo models of BCC for preclinical research. While there are many advancements left to be made towards improving patient outcomes with BCC, it is clear that targeting the Hh pathway will remain at the forefront of research efforts in designing more effective chemotherapeutics as well as relevant preclinical models.

Retrospective evaluation of the utility of two-step surgery for facial basal cell carcinoma and squamous cell carcinoma

In older patients with facial basal cell carcinoma (BCC) or squamous cell carcinoma (SCC), surgery should be aimed to reduce treatment-related sequelae and burden with achieving local tumor care. Therefore, we adopted a two-step surgery (TSS) involving the application of a dermal regeneration template onto the skin defect after tumor resection and subsequent reconstruction by full-thickness skin grafting. We performed a detailed comparison of conventional one-step surgery (OSS) and TSS, including evaluation of local tumor curability, postoperative cosmetic and/or functional impairments, and patient burden. Forty-six patients who underwent TSS and 104 patients treated with OSS were retrospectively investigated. The cohort consisted of 77 men and 73 women (median age, 83 years). The BCC: SCC ratio was 56.7%: 43.3%. The tumor size and excision margin were significantly larger in the TSS group than in the OSS group (p = 0.03). The histopathological margin was positive after the first surgery in six cases, but was negative after additional resection in all cases, regardless of OSS or TSS. Local recurrence was not observed in this study. The frequency of postoperative sequelae (POS) in TSS was slightly lower than in OSS (17.4% vs. 27.9%, p = 0.16). A shorter average operation time per session was significantly associated with the location of the vertical defect [below adipose tissue vs. within adipose tissue, estimate: −0.28 (hour), p &lt; 0.001] and surgical procedure [OSS vs. TSS, estimate: −0.13 (hour), p = 0.03] by multiple regression models. The ratio of general anesthesia was relatively lower in TSS than in OSS (9.8% vs. 17.3%, p = 0.12). Thus, TSS showed a good local curability and POS statistically equivalent to OSS, reducing the surgical burden, particularly shortening each operation time without any adverse events, despite the TSS group having significantly larger tumors than the OSS group. Since TSS is a simple procedure, it can be an outstanding option for facial BCC and SCC.

Patients are Willing and Successful With Home Suture Removal After Mohs Surgical Procedures

BACKGROUND

Suture removal after surgery is low risk; however, it is often performed by a medical provider. The current SARS-CoV-2 pandemic has forced providers to assess means of reducing in-person contact.

OBJECTIVE

To determine whether patients undergoing Mohs surgery are willing and successful with home suture removal.

MATERIALS AND METHODS

A prospective study was performed with patients undergoing Mohs surgery. Before their surgery, patients were assessed for their willingness to remove sutures before and after viewing educational material. Patients who were willing to attempt removal were contacted after expected suture removal date to verify success and assess their experience.

RESULTS

One hundred fifty patients were enrolled in the study. 90.1% were willing to attempt home suture removal. Patients were more willing ( p = .003), more confident ( p = .024), and had lower anxiety ( p = .049) with removal after viewing educational resources. Patients with a history of suture removal were more likely to attempt removal after their procedure ( p = .036). Ninety-seven percent of patients who were willing to attempt suture removal were successful. There were no major complications with removal.

CONCLUSION

Patients were overwhelmingly successful with suture removal after an educational intervention. Providers should consider providing this option after surgical procedures when clinically appropriate.

Clinicopathological factors influencing the number of stages of Mohs surgery for basal cell carcinoma

Background

Mohs Micrographic Surgery (MMS) is commonly used to treat high-risk basal cell carcinoma (BCC).

Objectives

Correlate clinicopathologic preoperative features with the number of MMS stages (primary endpoint) and margins (secondary endpoint) required for BCC complete excision.

Methods

We retrospectively analyzed BCCs treated by MMS in a 2-year period at the study’s institution. Variables studied included the patient gender, age, immune status, lesion size, location, if it was a primary, recurrent, or persistent tumor, histopathologic characteristics, number of surgical stages, and amount of tissue excised.

Results

116 BCCs were included. The majority (61.2%, n = 71) required a single-stage surgery for complete clearance, requiring a final margins of 3.11 ± 2.35 mm. Statistically significant differences between locations in different high-risk areas (periocular, perioral, nose, ear) and the number of MMS stages required for complete excision (p = 0.025) were found, with periocular tumours requiring the highest mean of stages (2.29 ± 0.95). An aggressive histopathology significantly influenced the number of MMS stages (p = 0.012). Any significant relation between clinicopathological features and variation in the final surgical margins was found, just certain tendencies (male patients, persistent tumor, periocular location, and high-risk histopathological tumors required larger margins). Neither patient age or tumor dimension correlated significantly with both number of MMS stages and final surgical margins.

Study limitations

Limitations of this study include its single-center nature with a small sample size, which limits the value of conclusions.

Conclusion

Main factors related to a greater number of MMS stages were periocular location and high-risk histopathological subtype of the tumor.

Recurrence rate of basal cell carcinoma among different micrographic surgery techniques: Systematic review with meta-analysis

In high-risk basal cell carcinomas (BCCs), micrographic surgery (MS) has high tissue preservation and low recurrence rates. The Mohs technique is the most commonly used technique, with limited use of other MS techniques. No studies have been designed to compare the MS methods. This review aimed to assess BCC recurrence rates of different MS techniques. A systematic review and meta-analysis was conducted to search for related studies in PubMed, LILACS, EMBASE, SCOPUS, WEB OF SCIENCE, CINHAL, and COCHRANE until March 2021. Randomized clinical trials (RCTs) and observational studies involving patients with BCC and indications for different MS techniques were included. Study selection and data extraction were performed independently by three peer reviewers, as was the risk of bias assessment using the Joanna Briggs Institute tool. Pooled estimates were assessed using the random-effects model (Logit), and heterogeneity was assessed by the chi-square test (χ² ). Stata Software version 17.0 was used for analysis. Eighteen studies were included, 2 RCTs and 16 observational studies. The overall recurrence rate was 2% (95% CI, 1.0-3.0%; χ² = 46.2; p = 0.00; 18 studies, 10,424 BCCs). In studies using the Mohs technique, the recurrence rate was 3.0% (95% CI, 1.0-5.0%; χ² = 11.0; p = 0.00; 6 studies; 1,582 BCCs), with the Munich technique 3.0% (95% CI, 2.0-5.0%; χ² = 0.0; no heterogeneity; 3 studies; 404 BCCs), with Tubingen technique 1% (95% CI, 1.0-2.0%; χ² = 12.1; p = 0.00; 8 studies; 8,374 BCCs) and with the Muffin technique 0.0% (95% CI, 0.0-6.0%; 1 study; 64 BCCs). Relapse rates between MS techniques were low and appeared to be similar. However, the design of this review and the absence of primary studies that directly compare the techniques do not allow us to assert the superiority between them.

A review of Mohs Micrographic Surgery for skin cancer: Part 1 - melanoma and rare skin cancers

Mohs micrographic surgery is a precise and effective method commonly used to treat high risk basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) on the head and neck. Whilst the majority of evidence for Mohs relates to keratinocyte cancers, there is published evidence for other types of skin cancer. This review aims to discuss the evidence for using MMS to treat six different types of skin cancer, including melanoma, lentigo maligna, dermatofibrosarcoma protuberans, atypical fibroxanthoma, microcystic adnexal carcinoma and pleomorphic dermal sarcoma, particularly in the context of survival rates and cancer recurrence. These cancers were chosen as there was sufficient literature for inclusion and given MMS is most useful when cancers are contiguous, rather than for cancers with marked metastatic potential such as angiosarcoma or merkel cell carcinoma. We searched Medline, Pubmed and Embase using the keywords: 'melanoma', 'mohs micrographic surgery', 'lentigo maligna', 'dermatofibrosarcoma protuberans', 'atypical fibroxanthoma', 'microcystic adnexal carcinoma' and 'pleomorphic dermal sarcoma' along with their appropriate synonyms, to identify the relevant English-language articles from the year 2000 onwards given that literature for Mohs on non-keratinocyte is sparse prior to this date. A MeaSurement Tool to Assess systematic Reviews (AMSTAR) was used to assess the validity of systematic reviews. Further high-quality, multi-centre randomised trials are necessary to establish the indications and efficacy of MMS for rarer cancers, particularly for AFX and PDS, where limited studies were identified.