Laser Doppler flux-metry in laryngeal squamous cell carcinoma.

Tumour angiogenesis has recently attracted a great deal of attention as a critical part of oncogenesis and a necessary prerequisite for a malignant phenotype. Novel antiangiogenic therapy for solid tumours including laryngeal cancer is entering clinical trials. Quantifying microvessel density is considered the gold standard for measuring baseline angiogenesis and indeed 'the response to intervention'. We hypothesize that laser Doppler flux-metry could provide a non-invasive reliable method of quantifying blood flux within tumours. The aims were to determine whether a laser Doppler flux meter could be used as a reliable and reproducible method of estimating blood flux in the human larynx and to establish baseline Doppler flux recordings for the human larynx. The method used was a validation study in patients with laryngeal squamous cell cancer and normal controls. Statistical analysis was performed using SPSS software. We have demonstrated good reproducibility of laser Doppler measurements in human laryngeal mucosa (correlation coefficient 0.956 @P = 0.01). We have also derived arbitrary means of laser Doppler flux-metry in normal laryngeal mucosa and in squamous cell carcinoma of the larynx. Comparisons between normal and tumour laser Doppler flux-metry (LDF) readings showed no significant difference. We suggest that Laser Doppler flux-metry is a potentially useful tool with which to study blood flow in the larynx and propose arbitrary LDF levels for the normal and diseased human larynx.