TTK and head and neck cancer: CEP55 expression is correlated with metastasis in breast cancer [19] and esophageal cancer [20]; KIFC1 is found in non-small-cell lung cancer [21] and head and neck cancers [22]; TPX2 in prostate cancer [23] and non-small-cell lung cancer [24]; KIF4A in colorectal cancer [25] and liver cancer [26]; NCAPG in non-small-cell lung cancer [27]; HJURP in liver cancer [28] and pancreatic cancer [29]; TTK in endometrial cancer [30] and breast cancer [31]; CENPA in clear renal cell carcinoma [32]; CKAP2L in clear renal cell carcinoma [33]; and DLGAP5 in bladder cancer [34].