Pathology All of the following are features of medullary carcinoma of thyroid, except: A Arises from parafollicular cells or C-cells B Known association with MEN-2A or MEN-2B syndromes C RAS gene mutations plays an impoant role in its tumourigenesis D Tumour cells secrete calcitonin 💡 Explanation All of the following are features of medullary carcinoma of thyroid, except: ✓ Correct Answer: C. RAS gene mutations plays an impoant role in its tumourigenesis