Low PTH in patients on dialysis, such as(a) our patient reported here, (b) those in theliterature,2, -4 and (c) those receivingCinacalcet5, , , , , , , , , , , , , -19 or Velcalcetide21 do regularly lead to a decrease in serumPi or overt hypophosphatemia. The gene discussed is PTH; the disease is hypophosphatemia.