title: Defining recurrence of nonmelanoma skin cancer after Mohs micrographic surgery: Report of the American College of Mohs Surgery Registry and Outcomes Committee.
abstract: BACKGROUND
  Standardized definitions and methods of surveillance for local recurrence of nonmelanoma skin cancer are critical in determining cure rates attributed to treatment modalities.
  
  
  OBJECTIVE
  We sought to offer a standard definition of local recurrence after surgical treatment of nonmelanoma skin cancer and to propose an acceptable surveillance period and tracking methods.
  
  
  METHODS
  A literature search was performed for background definitions of local recurrence and tracking methods. The American College of Mohs Surgery (ACMS) Registry and Outcomes Committee then conducted a modified Delphi process to arrive at consensus definitions.
  
  
  RESULTS
  We define local recurrence as a tumor with comparable histology, with contiguity to the surgical scar after treatment, and that arises within the area of the previously treated tumor.
  
  
  CONCLUSIONS
  This project reports the results of a modified Delphi method process involving members of the ACMS. The model described may not be useful for nonexcision type treatments such as topical chemotherapy, electrodessication and curettage, or radiation treatment.
  
  
  CONCLUSIONS
  Previous definitions of recurrence and surveillance methods after surgical treatment of nonmelanoma skin cancer are variable and nonstandard. We describe consensus standards for defining and tracking recurrence that should allow for consistent scientific evaluation and development of performance data in skin cancer outcomes registries.
authors.affiliation: Department of Dermatology, Oregon Health and Science University, Portland, Oregon. Electronic address: leitenbe@ohsu.edu.
authors.forename: Justin J
authors.initials: JJ
authors.lastname: Leitenberger
authors.affiliation: Advanced Dermatology, Norwich, Connecticut.
authors.forename: Howard
authors.initials: H
authors.lastname: Rogers
authors.affiliation: Surgical Dermatology Group, Birmingham, Alabama.
authors.forename: John C
authors.initials: JC
authors.lastname: Chapman
authors.affiliation: Department of Dermatology, Saint Louis University, St Louis, Missouri.
authors.forename: Ian A
authors.initials: IA
authors.lastname: Maher
authors.affiliation: Dell Medical School, University of Texas at Austin, Austin, Texas.
authors.forename: Matthew C
authors.initials: MC
authors.lastname: Fox
authors.affiliation: Advanced Dermatology, Norwich, Connecticut.
authors.forename: Chris B
authors.initials: CB
authors.lastname: Harmon
authors.affiliation: Advanced Dermatology, Norwich, Connecticut.
authors.forename: Evans C
authors.initials: EC
authors.lastname: Bailey
authors.affiliation: Skin Surgery Center, Seattle, Washington.
authors.forename: Peter
authors.initials: P
authors.lastname: Odland
authors.affiliation: Department of Dermatology, University of Southern California, Los Angeles, California.
authors.forename: Ashley
authors.initials: A
authors.lastname: Wysong
authors.affiliation: Department of Dermatology, University of Michigan Health System, Ann Arbor, Michigan.
authors.forename: Tim
authors.initials: T
authors.lastname: Johnson
authors.affiliation: Bend Memorial Clinic, Bend, Oregon.
authors.forename: Oliver J
authors.initials: OJ
authors.lastname: Wisco
mesh_terms: D000465:Algorithms; D002280:Basal Cell Carcinoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D002921:Cicatrix / Q000473:pathology; D032921:Consensus; D003697:Delphi Technique; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D000072662:Margins of Excision; D008962:Models, Theoretical; D015580:Mohs Surgery; D009362:Neoplasm Metastasis; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis*; D016609:Neoplasms, Second Primary / Q000175:diagnosis; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D012985:Software Design; D016896:Treatment Outcome
keywords: Mohs micrographic surgery; basal cell carcinoma; local recurrence; outcomes; recurrence; registry; squamous cell carcinoma; surveillance