By rray, 1 August, 2024 Detail (Long) Known gene variants/mutations: <i>BRCA1/BRCA2</i>, <i>CHEK2</i>, <i>ATM</i>, <i>PALB2</i>, Lynch syndrome (HNPCC), <i>HOXB13</i>; refer to genetics specialist.<sup>8,13</sup>