Clinicopathological Characteristics of Mutation and Amplification in Korean Patients with Breast Cancers.

The frequency of mutation and amplification was various and their clinical significances have not been clarified in Korean patients with invasive breast carcinoma (IBC). The study aimed to investigate the clinical and prognostic significances of mutation and amplification in IBC patients. DNA was isolated from paired normal and tumoral tissues in 128 IBC patients and the mutation and expression of gene were analyzed. mutation and expression was detected in 14.3% and 21.9% of IBC patients, respectively. And the level of expression was not different according to the presence of mutation (p = 0.775). mutation and expression were significantly associated with Luminal A type (p = 0.017 and p = 0.011, respectively). However, they did not have any clinical and prognostic values for IBC patients. This result suggested that alterations of PIK3CA pathway contribute to the pathogenesis of specific type of IBC.