Table 3

Effect of time of fixation on oestrogen receptor (ER) immunohistochemistry

ConditionsNo. of samplesER (mean±SD: %)p Value (paired t test)
Time to fixation
 Immediate496.8±4.500.3129
 16 h89.5±16.4
Insufficient fixation
 48 h887.1±25.30.0364
 3 h66.1±34.6
Prolonged fixation
 48 h1095.8±4.3vs 48 h
 14 days88.3±12.60.2152
 28 days84.5±18.60.2665
 56 days85.8±15.40.2010