ERBB2 and breast cancer: Figure 3 shows the distribution of the copy number alterations of KIAA1967 in the 4 BC subtypes. We noticed that the gene was mostly deleted. Indeed, it was deleted in 50% of LumA samples, and in 35% of the samples, there were no alterations. Only a small fraction of samples (15%) showed a gene amplification. As in lumA, also in other BC subtypes, KIAA1967 was mostly deleted: 59% of the lumB samples, 66% of the HER2 samples, and 60% of the basal samples.