PIK3R1 and metastatic malignant neoplasm in the lymph nodes: Moreover, it was stated that the expression level of the PIK3CA, PIK3R1, PTEN, AKT1, mTOR genes does not depend on the patients’ age, lymph node metastases, ER, PR status and Ki-67 index (Table 4, Figure 4, Tables S4–S9).