Objective To analyze serum levels of long chain non coding RNA(lncRNA)ANRIL,CCR4-NOT transcription complex subunit 2(CNOT2)in breast cancer patients and their relationship with clinico-pathological characteristics and prognosis.Methods From February 2018 to February 2021,a total of 126 eld-erly patients with breast cancer in the hospital were selected as the breast cancer group.According to whether tumor progression occurred during follow-up,the patients were divided into poor prognosis group(n=26)and good prognosis group(n=100).60 old healthy female people who underwent physical examination during the same time were taken as control group.Statistical analysis was used to study the differences of serum lncRNA ANRIL and CNOT2 levels in patients with different clinical and pathological characteristics.The prognostic factors of elderly patients with breast cancer were conducted by Kaplan-Meier curve and Cox regression analy-sis.Receiver operating characteristic curve was drawn to assess the prognostic value of serum lncRNA ANRIL and CNOT2 in elderly patients with breast cancer.Results The levels of serum lncRNA ANRIL and CNOT2 in the breast cancer group were higher than those in the control group(P＜0.05).The serum lncRNA AN-RIL and CNOT2 levels in patients with TNM stage Ⅲ and histological grade Ⅲ were higher than those in pa-tients with TNM stage Ⅰ-Ⅱ and histological grade Ⅰ—Ⅱ(P＜0.05).The level of serum lncRNA ANRIL and CONT2 in poor prognosis group were higher than that in the good prognosis group(P＜0.05).The 3-year progression free survival rates of lncRNA ANRIL high and low expression group,CNOT2 high and low expression group were 66.67％(40/60),90.91％(60/66)and 66.13％(41/62),92.19％(59/64),respective-ly,with statistically significant differences(P＜0.05).TNM stage Ⅲ,histological grade Ⅲ,serum lncRNA ANRIL and CNOT2 were risk factors affecting the prognosis of elderly patients with breast cancer(P＜0.05).The area under the curve of serum lncRNA ANRIL and CNOT2 combined in assessment of prognosis in elderly patients with breast cancer was higher than that of lncRNA ANRIL and CNOT2 alone(P＜0.05).Conclusion The expression of serum lncRNA ANRIL and CNOT2 in elderly breast cancer are up-regulated,which are related to TNM stage and histological grading,and are markers to evaluate the prognosis of elderly patients with breast cancer.