Objective The aim of this study was to evaluate the effect of postoperative radiotherapy on local recurrence-free survival(LRFS)and overall survival(OS)in patients with triple-negative breast cancer (TNBC).Methods The clinical data of 186 cases for TNBC were collected from the Affiliated Tumor Hospital of Harbin Medical University from January 2003 to December 2006.These cases were confirmed by pathology.The patients were divided into radiotherapy and non-radiotherapy groups.The survival curves were plotted by Kaplan-Meier method.Log-rank test method was used to detect the difference between the radiotherapy and non-ra-diotherapy groups for 10 years.Univariate and multivariate analyses were used to determine the prognostic factors for TNBC patients.Results The 10-year LRFS of radiotherapy group and non-radiotherapy group were 80.2%and 76.0%,respectively.The 10-year OS was 86.0%and 74.0%in radiotherapy group and non-ra-diotherapy group,respectively.Both of them showed a statistically difference(P <0.05).Subgroup analysis showed that LRFS and OS were 81.8%and 81.8%in 10 years for radiotherapy in patients with T 1-2N1(1-3 lymph node metastases)M0,respectively,76.4% and 79.4% for non-radiotherapy group,respectively.No differences were observed in both of LRFS and OS in radiotherapy and non-radiotherapy groups(P>0.05). Multivariate analysis showed that radiotherapy and clinical staging were independent factors influencing the sur-vival of TNBC patients.Conclusion Radiotherapy can improve the LRFS and OS in TNBC patients,but radio-therapy does not improve LRFS and OS for TNBC patients with T 1-2N1(1~3 lymph node metastases)M0.Radio-therapy and clinical staging are independent factors that affect the prognosis of TNBC patients.

The Flash radiotherapy(Flash-RT),which is the key breakthrough in the basic field of radiotherapy technique,which is expected to cause a new major transformation in the field of radiotherapy.In this paper,we reviewed the latest research advances of the application and the mechanism exploration of Flash-RT in tumor treatment.Current studies have found that both the Flash-RT with electron beams and photon and the Flash-RT with proton can reduce injury of normal tissue than radiotherapy with conventional dose-rate,but the relevant mechanisms are not yet clearly understood,which includes but not limited to oxygen depletion,DNA damage,cellular senescence,apoptosis and immune response.The difference of Flash-RT injury between tumor tissue and normal tissue further reduces the limitations of radiotherapy,and reduces the adverse reaction and complication compared with conventional radiotherapy,which has wide application prospects.