When compared to grade- and ER-matched IDC-NSTs, mixed MPCs significantly more frequently harboured amplification of multiple regions on 8q (adjusted Fisher's p value < 0.05).     ///    "Our results suggest that micropapillary differentiation in breast cancer may identify a subgroup of more aggressive ER-positive breast carcinomas, even in those featuring a mixed histology, and that mixed MPCs are more closely related to pure MPCs than to IDC-NSTs.. "    ///    "however, this histological type is more frequently found admixed with invasive ductal carcinomas of no special type (IDC-NSTs). "    ///    "Furthermore, mixed MPCs displayed higher proliferative rates than grade- and ER-matched IDC-NSTs. "    ///    "Using high-resolution microarray comparative genomic hybridization (aCGH), we profiled a series of 10 MPCs of mixed histology and 20 IDC-NSTs matched for grade and oestrogen receptor (ER) status. "