The presence of persistent hyperparathyroidism at 12 months had a positive correlation with alkaline phosphatase before KT (r = 0.39; p=0.006), hyperphosphatasemia before KT (r = 0.34; p=0.02), vitamin D deficiency at 6 months (r = 0.39; p=0.007), hyperparathyroidism at 6 months (r = 0.60; p=0.001), PTH at 6 months (r = 0.86; p=0.001), and alkaline phosphatase at 6 months (r = 0.36; p=0.003), with a negative correlation with vitamin D concentrations at 6 months (r = −0.29; p=0.020). The gene discussed is PTH; the disease is vitamin D deficiency.