In a previous study we demonstrated at light microscopical level the presence of variable amounts of type IV collagen in the areas of periductal and interstitial elastosis in breast cancer. The present work was directed towards a further study by immunoelectron microscopy of the distribution of type IV collagen in the areas of periductal elastosis. The semithin sections showed a distinct immunoreactivity of all basement membranes for type IV collagen but no staining of the interstitial stroma. Corresponding ultrathin sections demonstrated a broad basement membrane with immunoreactivity for type IV collagen at its outer side. Many punctiform deposits of type IV collagen were observed in the areas of periductal elastosis but not around normal ducts or vessels. Recently the role of type IV collagen as a structural component on anchoring plaques between the basement membrane and the underlying stroma in the dermis has been emphasized. The results of this study demonstrate the presence of type IV collagen deposits below a thickened basement membrane in breast cancer.
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