<qa>  What is the effect of cinacalcet HCl on the management of secondary hyperparaThe purpose of this study is to observe the effects of a treatment strategy that incorporates cinacalcet HCl into the management of secondary hyperparathyroidism HPT in subjects with ESRD receiving hemodialysis, on bio-intact parathyroid hormone biPTH, corrected serum calcium, serum phosphorus, and calcium phosphorus product. 