title: Impact of the 2009 (7th edition) AJCC melanoma staging system in the classification of thin cutaneous melanomas.
abstract: BACKGROUND
  The 7th (2009) edition of the AJCC melanoma staging system incorporates tumor (Breslow) thickness, MR, and ulceration in stratifying T1 primary melanomas. Compared to the prior 6th (2001) edition, MR has replaced CL for thin melanomas.
  
  
  OBJECTIVE
  We sought to identify and report differences of the classification of thin melanomas as well as outcome of SLNB in patients according to the 6th and 7th editions at our institution.
  
  
  RESULTS
  106 patients were identified with thin melanomas verified by wide excision. 31 of 106 thin melanomas were reclassified according to the 7th edition of the AJCC. Of those 31, 15 CL II/III patients (6th edition T1a) were reclassified as T1b based on the presence of mitoses while 16 CL IV patients (6th edition T1b) were categorized as T1a based on the absence of mitoses. 26/31 reclassified patients underwent SLNB, and all were negative. Patients with thin melanoma and a +SLNB (N = 3) were all classified as T1b according to both staging systems.
  
  
  CONCLUSIONS
  In our experience, 29% of thin melanomas were reclassified according to the 7th edition with similar proportions of patients re-distributed as T1a (14%) and T1b (15%). Cases with +SLN corresponded with T1b lesions in both 6th and 7th editions.
authors.affiliation: Department of Pathology, Baylor College of Medicine, Houston, TX 77030, USA.
authors.forename: Vicki H
authors.initials: VH
authors.lastname: Chu
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Michael T
authors.initials: MT
authors.lastname: Tetzlaff
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Torres-Cabala
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Victor G
authors.initials: VG
authors.lastname: Prieto
authors.affiliation: Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Roland
authors.initials: R
authors.lastname: Bassett
authors.affiliation: Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Jeffrey E
authors.initials: JE
authors.lastname: Gershenwald
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Michael S
authors.initials: MS
authors.lastname: McLemore
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Doina
authors.initials: D
authors.lastname: Ivan
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Wei-Lien Billy
authors.initials: WL
authors.lastname: Wang
authors.affiliation: Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Merrick I
authors.initials: MI
authors.lastname: Ross
authors.affiliation: Section of Dermatopathology, Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
authors.forename: Jonathan L
authors.initials: JL
authors.lastname: Curry
mesh_terms: D000328:Adult; D000368:Aged; D006801:Humans; D008297:Male; D008545:Melanoma / Q000145:classification* / Q000175:diagnosis* / Q000473:pathology; D008875:Middle Aged; D008938:Mitosis; D009367:Neoplasm Staging; D011379:Prognosis; D012878:Skin Neoplasms / Q000145:classification* / Q000175:diagnosis* / Q000473:pathology; D000096142:Cutaneous Malignant Melanoma