In each of these cases, subtype B was the subtype common in the concentrated epidemic and a non-B subtype replaced it as the epidemic grew [9], [16].
On the other hand, still only little is known about commonly altered genes, shared molecular subtypes, common alterations in signaling or metabolic pathways, or activities of major transcriptional regulators.
The H4 subtype was common in all 3 studies, but while our study and the North American study share a high number of H6 isolations, the German study had higher numbers of H1 and H2 (Table 4).
Recent studies have attempted to control for tumor molecular subtypes, recognizing that more aggressive subtypes are more common in younger women.
Of these subtypes, the basal-like tumour subtype, which is common in BRCA1 mutation carriers, is characterised by a high number of chromosomal copy number changes.
Acute lymphoblastic leukemia occurs more often in children, whereas the other subtypes are more common in adults.
Both of these subtypes are more common in whites than blacks.
But we still have explicitly differed the concepts of subtype-specific and general (common) in both subtypes.
One study has suggested that the HER2 subtype is more common in Asian populations and that the distribution of breast cancer subtypes among Asian women may vary by ethnicity (i.e., Chinese, Japanese, etc).
The luminal A and normal breast-like subtypes were the most common subtypes in the population as a whole (27% each), whereas the luminal A subtype was the most common subtype in women with low AD breasts (36%), and the normal breast-like subtype was most common in women with high AD breasts (33% P=0.249).
