#ExistRefRange>Report components include: DNA content, S-phase interpretation, and a copy of the histogram.
#ExistInterpData>In breast cancer, many studies indicate that low S-phase and diploid DNA content are associated with a relatively good prognosis. Conversely, the presence of aneuploid DNA content and a high S-phase tends to correlate with a worse prognosis.
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||A thin section of each tissue submitted is stained with H & E to verify the presence of tumor. The DNA content of each tumor is classified, in order of worsening prognosis, as diploid, near diploid, tetraploid, aneuploid, or hypertetraploid. The DNA index is the ratio of tumor G0-G1 cells to normal G0-G1 cells.
The tumor-specific S-phase is used when possible. An average histogram S-phase is used for diploid and some aneuploid tumors where the tumor and host S-phases cannot be separated. An average histogram S-phase is also used when the percentage of aneuploid cells in the histogram is low (less than 25%). The S-phase interpretation is based on comparison to over 5,000 breast tumors, controlled for histogram type (diploid, near-diploid, aneuploid) and sample type (fresh/frozen, paraffin). The appropriate population is divided into thirds and compared to the sample S-phase for an interpretation of low, moderate, or high S-phase.
||DNA Ploidy and S-Phase (DNA Content/Cell Cycle Analysis, Breast (Paraffin))