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Comparing primary ductal carcinoma in situ (DCIS) and subsequent invasive breast carcinoma (IBC) provides different insights than comparing synchronous DCIS and IBC. This is crucial for understanding breast cancer progression, especially regarding HER2 status.

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Area of Science:

  • Oncology
  • Pathology
  • Biomarkers

Background:

  • Ductal carcinoma in situ (DCIS) is a potential precursor to invasive breast carcinoma (IBC).
  • Previous studies often compared synchronous DCIS with IBC, questioning its validity for understanding DCIS progression.
  • The relationship between primary DCIS and subsequent IBC requires further investigation.

Purpose of the Study:

  • To compare immunohistochemical marker expression between primary DCIS and subsequent IBC.
  • To evaluate if comparing synchronous DCIS and IBC is a reliable surrogate for primary DCIS and subsequent IBC progression.
  • To assess marker discordance, particularly HER2 status, in DCIS to IBC transitions.

Main Methods:

  • Immunohistochemical analysis of ER, PR, HER2, p53, and COX-2.
  • Study included 143 primary DCIS and subsequent IBC lesions, with 81 IBC lesions having synchronous DCIS.
  • Statistical assessment using kappa and symmetry tests for marker agreement and conversion patterns.

Main Results:

  • Primary DCIS and subsequent IBC showed more discordant marker expression than synchronous DCIS and IBC.
  • 36% of women with HER2-positive primary DCIS developed HER2-negative IBC, a difference not seen with synchronous lesions.
  • Discordant marker expression frequency did not correlate with the time interval between primary DCIS and IBC.

Conclusions:

  • Comparing primary DCIS with subsequent IBC yields distinct results compared to comparing synchronous DCIS and IBC, especially for HER2 status.
  • Focusing on the primary DCIS to subsequent IBC relationship is essential for understanding breast cancer progression.
  • Synchronous DCIS-IBC comparisons may not accurately reflect the biological transition from in situ to invasive disease.