title: HLA Antigen Profile Differences in Patients with SCC (Squamous Cell Carcinoma) In-Situ /Actinic Keratosis and Invasive SCC: Is There a Genetic Succeptibility for Invasive SCC Development?
abstract: OBJECTIVE
  Actinic keratoses (AK) are proliferation of neoplastic keratinocytes confined to the epidermis induced by damaging solar ultraviolet radiation (UVR). When the neoplastic keratinocytes extend in to papillary-reticular dermis, then the lesion termed as squamous cell carcinoma (SCC). We have compared HLA class I and II antigen profiles in three patient groups namely: AK (n: 31) (patients without past or present invasive SCC), invasive SCC (n: 38), and SCC derived from / inconjuction with AK (n: 11).
  
  
  METHODS
  Low-resolution typing for the HLA-A, B, C and HLA-DR/DQ was performed by means of the PCR-sequence specific primer (PCR-SSP) method using SSP HLA class I generic DNA Typing Tray.
  
  
  RESULTS
  HLA results of these three groups were compared with the healthy control group (n: 100). There were not significant difference in HLA class I and II antigen profiles in AK group compared to the control. Whereas HLA-A2 allele (60.52%, p=0.016, OR=2.726, 95%CI=1.265-5.876), HLA-B60 (13.15%, p=0.025, OR=7.424, 95%CI=1.375-40.099) were higher in SCC group than the control. HLA-B51 allele (72.72%, p=0.008, OR=6.853, 95%CI=1.696-27.720) distribution were more common in SCC derived from AK than the control.
  
  
  CONCLUSIONS
  Historically, AKs have been characterized as premalignant. It has, however, been considered that AK and SCC represent the same disease process at the different stages of evaluation. Clinically, and histopathologically it is difficult to determine where AK ends and invasive SCC begins. From dermatopathological point of view AK is clearly SCC in-situ, however although AK is a common lesion in Caucasians, not all AKs develop in to invasive SCC, at least not with the same biological pace. We concluded that genetic differences such as HLA class I and II distribution between AK and SCC may not seem to play susceptibility role for invasive SCC development.
authors.affiliation: Atatürk University, Faculty of Medicine, Department of Dermatology, Erzurum, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Atasoy
authors.affiliation: Ankara University, Faculty of Medicine, Department of Dermatology, Ankara, Turkey.
authors.forename: Rana
authors.initials: R
authors.lastname: Anadolu-Braise
authors.affiliation: Atatürk University, Faculty of Medicine, Department of Medical Biology, Erzurum, Turkey.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Pirim
authors.affiliation: Atatürk University, Faculty of Medicine, Department of Medical Biology, Erzurum, Turkey.
authors.forename: Hasan
authors.initials: H
authors.lastname: Dogan
authors.affiliation: Karadeniz Teknik University, Faculty of Medicine, Department of Medical Biology, Erzurum, Turkey.
authors.forename: Mevlüt
authors.initials: M
authors.lastname: Ikbal
keywords: Actinic keratoses; HLA; Squamous cell carcinoma