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Positive And Negative Patients

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As regard the survival outcome, the median OS was 33 (range, 14-36; 95% CI, 29.11-36.89) months in all patients, while it was 22 months (range, 14-34; 95% CI, 12.04-31.96 months) and 35 (range, 16-36; 95% CI, 30.81-39.19) months for p95-HER2 positive and negative patients respectively. Two-year OS rate was 69.5% in all patients while it was 45.5% and 82.8% in p95-HER2 positive and negative patients respectively (p=0.030) (Fig. 2). The median PFS was 19 (range, 9-35; 95% CI, 16.63-21.37) months in all patients, while it was 14 (range, 9-28; 95% CI, 9.68-18.32) months and 21 (range, 12-35; 95% CI, 16.51-25.49) months in p95-HER2 positive and negative patients respectively. Two-year PFS rate was 31.3% in all patients while it was 9.1% and …show more content…

However the rate of positive expression of p95HER2 reported in most of the studies used western blot technique was nearly 30% [14, 19, 26]. Also, immunofluorescense and immunoprecipitation techniques are impractical to be utilized for routine specimens, in addition, it highly expensive techniques [27]. To overcome this limitation Scaltriti et al. [5] designed immunofluorescence in FFPE tissues method and recorded 100% and 94% positive and negative predictive values respectively. On comparing our results with reports in the literature that utilized technical methods other than IHC; Sáez et al. [14] using western blot analysis found that approximately 25% of the HER2-overexpressed BC patients express p185HER-2 and p95HER-2 receptors. Kallergi et al. [28] examined the expression of truncated HER2 on circulating tumor cells of BC patients using a triple-staining immunofluorescent method and recorded 11.1% and 39.1% p95HER2-positive rate for early and metastatic patients respectively. Christianson et al. [26] recorded 22.4% of BC tissues expressing p95HER2 with using western blotting and immunoprecipitations technique. Duchnowska et al. [24] using quantitative assessment of p95HER2 expression found that 33% of metastatic BC patients treated with trastuzumab were p95HER2 positive. Molina et al. [17] had reported 26.7% and 45.7% p95HER2 positivity rates in the primary HER2-positive

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