FIGURE 1

FISH of ERBB2 probe on paraffin-embedded tissue sections of three cases of breast carcinoma. A, tumor without amplification. A mean number of two signals per nucleus is observed. B, tumor with a high level amplification. Presence of numerous signals, arranged in clusters. C, tumor with the lowest amplification (dual color FISH): presence of five to six signals of the ERBB2 probe (red) and two centromeres of chromosome 17 (green).