The prognostic value of blood and lymph vessel parameters in lichen sclerosus for vulvar squamous cell carcinoma development: an immunohistochemical and electron microscopy study.
OBJECTIVE
The objective of the study was to quantify vessel type and density in lichen sclerosus (LS) to find a marker for its malignant potential.


METHODS
Quantitative analysis was performed on paraffin-embedded tissue samples of 28 patients with LS (7 adjacent to vulvar squamous cell carcinoma, 21 solitary) and immunohistochemical staining for CD34 (vascular and lymphangiogenic lymph endothelial cells), D2-40 (lymphatic-specific marker), and alpha-SMA (pericyte marker). Electron microscopy was performed on fresh tissue.


RESULTS
No significant differences in vessel density or other vessel parameters could be demonstrated between the 2 groups. In hyalinized lesions, vessel diameter, and alpha-SMA positivity was reduced compared with nonhyalinized lesions. Electron microscopy revealed detachment of pericytes from vascular endothelial cells and increased thickening of basement membrane, whereas endothelial cell function did not appear strongly impaired.


CONCLUSIONS
Malignant potential of LS cannot be predicted by vessel characteristics. Hyalinization in LS is associated with pericyte detachment from the basal lamina of vascular endothelial cells.
van der Avoort
Irene A M
IA
Department of Obstetrics and Gynecology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. i.vanderavoort@obgyn.umcn.nl
van der Laak
Jeroen A W M
JA
Otte-Höller
Irene
I
van de Nieuwenhof
Hedwig P
HP
Massuger
Leon F A G
LF
de Hullu
Joanne A
JA
van Kempen
Léon C L T
LC
D001707:Biopsy, Needle; D001808:Blood Vessels / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D002471:Cell Transformation, Neoplastic / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D042601:Lymphatic Vessels / Q000473:pathology; D008854:Microscopy, Electron; D016612:Paraffin Embedding; D011230:Precancerous Conditions / Q000473:pathology*; D011336:Probability; D011379:Prognosis; D018709:Statistics, Nonparametric; D014844:Vulva / Q000473:pathology / Q000648:ultrastructure; D007724:Vulvar Lichen Sclerosus / Q000473:pathology*; D014846:Vulvar Neoplasms / Q000473:pathology*