Statistical analysis carried out with the use of the U Mann–Whitney test showed a statistically significantly higher level of expression of the BIRC1 (p = 0.0000), BIRC2 (p = 0.0000), BIRC3 (p = 0.0000), BIRC4 (p = 0.0000), BIRC5 (p = 0.0003), BIRC6 (p = 0.0000), BIRC8 (p = 0.0000) genes in patients with TNBC who did not have cancer cell invasion of the fat tissue. This evidence concerns the gene BIRC8 and cancer.