Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) hyperphosphatemic familial tumoral calcinosis ?
    ### Response:
    Hyperphosphatemic familial tumoral calcinosis (HFTC) is a condition characterized by an increase in the levels of phosphate in the blood (hyperphosphatemia) and abnormal deposits of phosphate and calcium (calcinosis) in the body's tissues. Calcinosis typically develops in early childhood to early adulthood, although in some people the deposits first appear in infancy or in late adulthood.
    