Cyclin D1, a member of the family of cyclins, can control the passage of proliferating cells through cell cycle.37 Up‐regulation of CCND1 was observed in both benign and malignant thyroid tumours.37 Dys‐regulation of cyclin is closely related with oncogenesis and CCND1 functions as an oncogene in tumour progression. The gene discussed is CCND1; the disease is neoplasm.