Nine patients (5 men; mean [SD] age, 45.0 [15.4] years) who had been receiving regular hemodialysis for 76.8 [43.8] months were included in the study after subtotal PTX. All of them gave informed consent to participate in the study. Indication for PTX was based on clinical, biochemical, and radiological criteria.2 Three patients (patients 6, 7, and 8 in the Table) were positive for hepatitis virus B or C. None of the patients had iron deficiency anemia or blood loss, and none of them were treated with human recombinant erythropoietin before or after PTX. Histological examination found hyperplasia in all extirpated glands. The following laboratory analyses were done before and 6 months after PTX in all patients: hemoglobin, serum calcium, phosphorus, alkaline phosphatase, intact parathormone (iPTH) (radioimmunoassay; Nichols Institute Diagnostics, San Juan Capistrano, California) (normal values, 10-55 pg/mL), erythropoietin (Epo) (enzyme-linked immunosorbent assay 500; Medac, Wedel, Germany) (normal values for healthy nonanemic adults, 4-25 mU/mL), bone marrow burst-forming units erythroid (BFU-E)
(assayed by methyl cellulose culture technique in vitro3), and bone marrow cellularity.