PTK2 and colorectal carcinoma: Specifically, the circRNA hsa_circ_0005273 (from the PTK2 gene) was annotated to CRC disease in both circ2disease and CircFunBase, while hsa_circ_0002321, hsa_circ_0005576, hsa_circ_0004820, and circ_004661 transcribed respectively from the PPP2R5A, CDC42, NUP35, and PTPRA genes were annotated to CRC in CircFunBase.