Squamous cell carcinoma of the external ear: 170 cases treated with Mohs surgery. 2021

Abel González, and Dardo Etchichury, and Juan Mario Rivero, and Lucia Adamo
Angel H. Roffo Oncology Institute, Mohs Surgery Unit, Head and Neck Department, Alexander Fleming Institute, Skin Cancer Oncology, 1180 Cramer St., CABA (ZIP 1426), Buenos Aires, Argentina. Electronic address: dardo.etchichury@uocweb.com.

BACKGROUND Squamous cell carcinoma of the ear (SCC-E) shows high rates of local recurrence (LR) and lymph node metastases (NM). SCC-E is the leading cause of death from nonmelanoma skin cancer. OBJECTIVE To determine the LR and NM rates and survival after Mohs micrographic surgery (MMS). METHODS We treated 170 invasive SCC-E with MMS with a mean follow up of 48 months. Mean age was 76 years, 93.2% were male patients, mean size: 1.5 cm, and 61.8% of the tumours were well differentiated. RESULTS We observed 5 LRs, 2 locoregional recurrences, and 16 NMs in 23 patients. LR and NM rates were 4.1% and 10.6%, respectively. Only 3/25 recurrences occurred after 2 years of follow up. We observed 1(0.6%) distant metastasis (DM) in a patient who also presented LR + NM. Six out of seven cases with LR and 8/18 with NM died of disease, regardless of aggressive surgical rescue with or without adjuvant radiotherapy. Five-year overall survival, disease-free survival, and disease-specific survival were 81%, 82.6%, and 89.7%, respectively. CONCLUSIONS Undeniably, the outcome in SCC-E is determined by locoregional control. DM are sporadic and rarely the cause of death. Systematic reviews and retrospective studies show a solid trend in favor of MMS vs surgical excision. The LR rate of this series (4.1%) is one of the lowest published to date with regard to SCC-E, and confirms this assertion. We observed 10.6% NMs according to other series that treated the whole spectrum of SCC-E. Almost 2/3 of patients with NMs die after therapeutic rescue. We believe that it is essential to identify prognostic factors to select patients for one of the following: close surveillance (ultrasonography) during the first 2 years after surgery, sentinel node biopsy, or elective treatment of the nodes (surgery or radiotherapy).

UI MeSH Term Description Entries
D008207 Lymphatic Metastasis Transfer of a neoplasm from its primary site to lymph nodes or to distant parts of the body by way of the lymphatic system. Lymph Node Metastasis,Lymph Node Metastases,Lymphatic Metastases,Metastasis, Lymph Node
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009364 Neoplasm Recurrence, Local The local recurrence of a neoplasm following treatment. It arises from microscopic cells of the original neoplasm that have escaped therapeutic intervention and later become clinically visible at the original site. Local Neoplasm Recurrence,Local Neoplasm Recurrences,Locoregional Neoplasm Recurrence,Neoplasm Recurrence, Locoregional,Neoplasm Recurrences, Local,Recurrence, Local Neoplasm,Recurrence, Locoregional Neoplasm,Recurrences, Local Neoplasm,Locoregional Neoplasm Recurrences,Neoplasm Recurrences, Locoregional,Recurrences, Locoregional Neoplasm
D002294 Carcinoma, Squamous Cell A carcinoma derived from stratified SQUAMOUS EPITHELIAL CELLS. It may also occur in sites where glandular or columnar epithelium is normally present. (From Stedman, 25th ed) Carcinoma, Epidermoid,Carcinoma, Planocellular,Carcinoma, Squamous,Squamous Cell Carcinoma,Carcinomas, Epidermoid,Carcinomas, Planocellular,Carcinomas, Squamous,Carcinomas, Squamous Cell,Epidermoid Carcinoma,Epidermoid Carcinomas,Planocellular Carcinoma,Planocellular Carcinomas,Squamous Carcinoma,Squamous Carcinomas,Squamous Cell Carcinomas
D004428 Ear Neoplasms Tumors or cancer of any part of the hearing and equilibrium system of the body (the EXTERNAL EAR, the MIDDLE EAR, and the INNER EAR). Auricular Cancer,Auricular Neoplasms,Cancer of Ear,Ear Cancer,Cancer of Ear Auricle,Cancer of the Ear,Neoplasms of Ear Auricle,Neoplasms, Auricular,Neoplasms, Ear,Auricular Cancers,Cancer, Auricular,Cancers, Auricular,Ear Auricle Cancer,Ear Auricle Cancers,Ear Auricle Neoplasm,Ear Auricle Neoplasms,Ear Neoplasm,Neoplasm, Ear
D004431 Ear, External The outer part of the hearing system of the body. It includes the shell-like EAR AURICLE which collects sound, and the EXTERNAL EAR CANAL, the TYMPANIC MEMBRANE, and the EXTERNAL EAR CARTILAGES. External Ear,Outer Ear,Ear, Outer,Ears, External,Ears, Outer,External Ears,Outer Ears
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000368 Aged A person 65 years of age or older. For a person older than 79 years, AGED, 80 AND OVER is available. Elderly

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