Localization of parathyroid hormone‐related protein mrna expression in breast cancer and metastatic lesions by in situ hybridization

Socorro J. Vargas, Matthew T. Gillespie, Gerard J. Powell, Justine Southby, Janine A. Danks, Jane M. Moseley, John T. Martin

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Parathyroid hormone‐related protein (PTHrP) has been identified immunohistochemically in 60% of breast carcinoma1 and in 92% of breast cancer metastases in bone.2 To establish whether the localization of the PTHrP antigen reflects protein synthesis and also to investigate the role of PTHrP in metastatic disease, as part of an ongoing study, we used in situ hybridization to study the localization of PTHrP mRNA in a retrospective series of primary breast tumors and their metastatic lesions. Paraffin sections of 17 primary and 26 metastatic lesions, 11 of which were in bone, were available for the study: 10 of the 17 (59%) primary lesions, 8 of 11 (73%) breast cancer metastases to bone, and 3 of 15 (20%) metastases to non‐bone sites showed specific localization of PTHrP mRNA. These findings establish that PTHrP is commonly synthesized by primary breast cancers and support previous immunohistochemical studies reporting a higher incidence of PTHrP‐positive tumor cells in skeletal metastases than in nonskeletal metastases.

Original languageEnglish
Pages (from-to)971-979
Number of pages9
JournalJournal of Bone and Mineral Research
Issue number8
Publication statusPublished - 1 Jan 1992
Externally publishedYes

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