Considering that clinical variables such as age at initial diagnosis, molecular subtype and tumour stage may be potential confounders in survival analysis, coupled with the fact that pathological grade and Ki‐67 are prognostic factors for NEC,6 our team obtained a similar conclusion after eliminating differences in clinical characteristics between IDC and NEC cohorts by propensity score matching that NEC had worse DFS than IDC. The gene discussed is MKI67; the disease is neoplasm.