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Influence of the menstrual cycle on aminolevulinic acid induced protoporphyrin IX fluorescence in the endometrium: in vivo study.

Degen A, Gabrecht T, Wagnières G, Caduff R, Imthurn B, Wyss P

Department of Obstetrics and Gynecology, University Hospital of Zurich, 8091 Zurich, Switzerland.

BACKGROUND AND OBJECTIVES: In vitro studies indicated that compared to postmenopausal women, premenopausal women had increased aminolevulinic acid induced protoporphyrin IX (ALA-induced PpIX) fluorescence expression in the endometrium. The aim of this study was to evaluate menstrual cycle dependency of ALA-induced PpIX fluorescence in the endometrium in vivo. STUDY DESIGN/PATIENTS AND METHODS: Thirteen patients were included for in vivo spectrofluorometric measurements of ALA-induced PpIX in the endometrium and 51 patients for fluorescence hysteroscopy. Two milliliter of a 2% 5-ALA-solution at pH = 4.0 (ASAT AG/Zug, Switzerland) was topically administrated just before spectrofluorometry and 4 hours before hysteroscopy. Spectrofluorometry: Optical fiber based. Fluorescence hysteroscopy: STORZ-D-Light system (Storz, Tuttlingen, Germany). Histological classification of curettage and bioptic endometrial tissue stained with hematoxylin and eosin (H&E). RESULTS: Hysteroscopic and in vivo spectrofluorometric measurements showed an increase of ALA-induced PpIX fluorescence in the secretory and hyperplastic endometrium compared to proliferative and atrophic endometrium. CONCLUSIONS: The accuracy of fluorescence hysteroscopy and the success of the photodynamic endometrial ablation using ALA-induced PpIX may depend on the hormonal influence of the menstrual cycle. The mechanisms responsible for the increased ALA-induced PpIX fluorescence in the secretory versus proliferative phase of the menstrual cycle deserve further studies.

Published 21 March 2005 in Lasers Surg Med, 36(3): 234-7.
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