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]. This evidence concerns the gene FGFR2 and breast carcinoma.