The most frequently occurring fusion genes in each subtype were TTC6::MIPOL1 in HR+/HER2‒ breast cancers, LHFPL5::CLPSL1 in triple-negative breast cancer (TNBC), and TPTE2::MRPS31P2 in HER2+ breast cancers (Fig. 1g). The gene discussed is TPTE2; the disease is breast cancer.