1. Colon cancer (CRC) diagnosed in a patient less than 50 years of age.
2. CRC with MSI-H histology diagnosed in a patient less than 60 years of age.
3. Synchronous, metachronous colon cancer (CRC), or other LS/HNPCC-associated tumors.
4. Individual with colon cancer and at least one first degree relative with CRC/HNPCC tumor less than 50 years of age.
5. Patient with CRC and two or more first-or second-degree relatives with CRC/HNPCC-related tumors.
总之,是否需要做,做什么基因检测应首先进行遗传咨询(genetic consulting).
K-ras 突变检测是用于指导化疗而非预测癌发生。