c-Src Protein Expression Is Increased in Human Breast Cancer. An Immunohistochemical and Biochemical Analysis

J Pathol. 1996 Dec;180(4):383-8. doi: 10.1002/(SICI)1096-9896(199612)180:4<383::AID-PATH686>3.0.CO;2-N.


In human breast cancer, c-Src activity is elevated compared to normal breast tissue. It is not yet known whether this increase in c-Src activity is accompanied by an increase in c-Src protein expression. In this study, c-Src activity and protein expression were determined in a series of human breast cancers and in normal breast tissue, using immune complex kinase assays and immunoblotting. As the heterogeneity of breast cancer is not taken into account in these biochemical experiments, immunohistochemistry was also used to distinguish between normal and malignant cells. In human breast cancers, the c-Src activity is increased 4- to 30-fold, compared with normal breast tissue. This enhanced activity is accompanied by an increase in c-Src protein expression, as shown by both immunoblotting and immunohistochemistry. Immunohistochemistry indicates that the majority of c-Src appears to be concentrated around the nucleus in malignant cells, whereas in normal cells, it is distributed more evenly in the cytoplasm. These data confirm that c-Src activity is increased in human breast cancer. In addition, this study provides strong immunohistochemical evidence that the c-Src protein is also overexpressed, enabling a distinction to be made between normal and malignant cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomarkers, Tumor / metabolism*
  • Breast Neoplasms / enzymology
  • Breast Neoplasms / metabolism*
  • CSK Tyrosine-Protein Kinase
  • Electrophoresis, Polyacrylamide Gel
  • Female
  • Gene Expression
  • Humans
  • Immunoblotting
  • Immunoenzyme Techniques
  • Neoplasm Proteins / metabolism*
  • Protein-Tyrosine Kinases / metabolism
  • Proto-Oncogene Proteins pp60(c-src) / metabolism*
  • src-Family Kinases


  • Biomarkers, Tumor
  • Neoplasm Proteins
  • Protein-Tyrosine Kinases
  • CSK Tyrosine-Protein Kinase
  • Proto-Oncogene Proteins pp60(c-src)
  • src-Family Kinases
  • CSK protein, human