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Activation of c-Src is inversely correlated with biological aggressiveness of breast carcinoma

Yasuhiro Ito1, Hisaaki Kawakatsu, Tsutomu Takeda

  • 1Department of Surgery, Osaka Seamen's Insurance Hospital, Suita, Osaka, Japan.

Breast Cancer Research and Treatment
|December 5, 2002
PubMed

Insights

Activated c-Src was detected in over half of breast carcinoma tissues, inversely correlating with aggressive tumor features. This suggests activated c-Src may be linked to less aggressive breast cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • c-Src is a non-receptor protein tyrosine kinase implicated in cellular signaling.
  • Aberrant Src kinase activity is observed in various human cancers, including breast carcinoma.
  • Understanding the role of activated c-Src in breast cancer progression is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the involvement of activated c-Src in the carcinogenesis and progression of human breast carcinoma.
  • To correlate the expression of activated c-Src with clinicopathological features of breast cancer.

Main Methods:

  • Western blotting was used to confirm antibody specificity against activated c-Src (Clone 28) in breast carcinoma cell lines.
  • Immunofluorescence analysis localized activated c-Src within the cytoplasm of carcinoma cells.
  • Immunohistochemical staining was performed on 73 human breast carcinoma tissue specimens.

Main Results:

  • Activated c-Src was detected in 50.7% (37/73) of breast carcinoma tissues.
  • Positive staining for activated c-Src was inversely correlated with Ki-67 labeling index, TNM stage, tumor size, and histological grade.
  • Normal mammary gland cells and stromal cells adjacent to carcinoma were negative for activated c-Src.

Conclusions:

  • The activation of c-Src is associated with breast carcinomas exhibiting lower aggressiveness.
  • Activated c-Src expression may serve as a potential biomarker for less aggressive breast cancer subtypes.
  • Further research is warranted to elucidate the precise mechanisms by which c-Src influences breast cancer progression.

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