24 Arrigo Arrigo GD GD Pizzini Pizzini P P Cutrupi Cutrupi S S Tripepi Tripepi R R Tripepi Tripepi G G Mallamaci Mallamaci F F FGF23 and the PTH response to paricalcitol in chronic kidney disease FGF23 and the PTH response to paricalcitol in chronic kidney disease Eur J Clin Invest Eur J Clin Invest 2020 2020 50 50 2 2 1 1 9 9. The gene discussed is PTH; the disease is chronic kidney disease.