Hypercalciuria, Absorptive, 1, also known as hypercalciuria, absorptive, is related to gastric adenocarcinoma and hypercalciuria, absorptive, 2. An important gene associated with Hypercalciuria, Absorptive, 1 is HCA1 (Hypercalciuria, Absorptive, 1). Affiliated tissues include brain and breast.