Tenascin in breast cancer development--is epithelial tenascin a marker for poor prognosis?

Cancer Letters
Toshimichi YoshidaTeruyo Sakakura

Abstract

(1) In mouse mammary gland development, immunoreactive tenascin (TN) is expressed in the dense mesenchyme surrounding the epithelial component of 14-day embryos, endbuds at puberty, and tumors. (2) Cells that produce TN are myofibroblastic and are characterized by nuclear invaginations, rough endoplasmic reticulum, and pinocytotic vesicles. These cells are not normally present in the stroma of mammary glands but present in cancer stroma, originating probably from fibroblasts differentiated under the influence of TGF-beta 1 stimulation. (3) Breast cancer cells are capable of synthesing TN under certain conditions. TN-non-producing MCF7 cells can produce TN when co-cultured with embryonic fibroblasts or with their conditioned medium. (4) Nine primary human breast cancers were examined for TN expression by in situ hybridization. TN mRNA was expressed in all nine cases in the stroma and in four cases in carcinoma cells as well. (5) Immunohistochemistry for TN was performed in human breast cancers, and it was found that the five-year survival after surgery was markedly lower in the group whose cancer cells were positive [corrected] for TN. TN expression in cancer cells appears to indicate poor prognosis.

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