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The aim of this study was to investigate the expression of the activated (phosphorylated) form of Akt (Ser473) in primary breast cancer and to correlate the results with clinicopathological and prognostic variables for clinically relevant associations. Phospho-Akt expression was studied using immunoblot analysis in 49 invasive breast carcinomas (median follow-up time 55 months, range 7-74 months). We assessed the level of phospho-Akt in different types of primary breast cancers and compared the use of autoradiograph X-ray film with a PVDF-DAB-staining system. Twelve percent of the tumours had no phospho-Akt protein, 25% had low phospho-Akt expression, 51% had intermediate expression and 12% had high phospho-Akt expression. No relationship was observed between phospho-Akt and tumour grade, tumour size or nodal status. A significant relationship was demonstrated between phospho-Akt score and oestrogen receptor status (P=0.014). Univariate analysis demonstrated that intermediate levels of phospho-Akt in breast tumour tissue are associated with a lower probability of developing recurrences (P=0.035), while in multivariate analyses, none of the phospho-Akt levels appeared to be independent predictors of disease recurrence or death. In addition, it has been clearly established that a suitable composition of reagents and components such as PVDF membranes treated with DAB substrate will enable the performing of sensitive immuno-analyses.

Immuno-analysis of phospho-Akt in primary human breast cancers