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Objectives: The aim of this was the assessment of the prognostic role of the rs4938723 C > T polymorphism of the miR-34 in triple negative breast cancer patients. Methods: Therefore formalin fixed paraffin embedded tissue samples from 114 triple negative breast cancer patients and blood samples from 124 healthy donors were genotyped and subsequently extensive statistical analysis was performed in order to investigate the clinical value of this polymorphism in triple negative breast cancer. Results: Our statistical analysis disclosed that the majority of patients harboring ductal breast carcinoma (69.4%) have the TC or CC genotypes (P = .020). Moreover the survival of the patients was significantly correlated with the occurrence of the TC or CC alleles (P < .001). Regarding the correlation of miR-34 polymorphisms with patients' survival we found that women with TC or CC single nucleotide polymorphisms were characterized by shorter disease free survival intervals (P = .05). Furthermore triple negative breast cancer patients with TC/CC genotype exhibited shorter overall survival intervals as disclosed by Kaplan Meier analysis (P < .001) and Cox regression analysis (HR = 3.2, %95 CI = 2.0–5.5, P = .008). Stratified Kaplan-Meier analysis showed that the women harboring the TC or CC genotype along with the ductal histology had significantly shorter survival (P < .001). This result was also confirmed by Univariate Cox regression analysis, which showed that women ductal breast cancer and TC or CC genotype are of worse prognosis (HR = 2.35, %95 CI = 2.1–4.65, P = .003). Conclusions: In conclusion, we found that the TC and CC alleles are associated with unfavorable prognosis in triple negative breast cancer patients. © 2019 The Canadian Society of Clinical Chemists