['At present, there is a high incidence of elderly patients with advanced chronic kidney disease (CKD) and it is important to know the long term progression and the factors that influence it.', 'To analyse the progression of advanced CKD in elderly patients and the influence of bone-mineral metabolism.', 'Retrospective study of 125 patients ≥70years of age with CKD stages 4-5 who started follow-up from January 1, 2007 to December 31, 2008, showing the progression of CKD (measured by the slope of the regression line of the estimated glomerular filtration rate [eGFR] by MDRD-4) over 5years.', 'Progression in the entire group (median and 25th and 75th percentiles): -1.15 (-2.8/0.17) ml/min/1.73m'] Are pTH levels and not serum phosphorus levels a predictor of the progression of kidney disease in elderly patients with advanced chronic kidney disease?