The coiled coil domain was found in FGFR2::CCDC6 (breast cancer, iCCA), FGFR2::CIT (lung carcinoma), and FGFR2::KIAA1967 (lung squamous cell carcinoma) fusions, all of which exhibited constitutive dimerization [23]. The gene discussed is CCAR2; the disease is breast carcinoma.