Diseases have been known to mankind since ancient times in history. Some of these diseases can be grouped into multiple categories such as a cancer. Over the years, medications have been improving to either cure or prevent these illnesses. The discovery of genes has given scientists a better understanding of diseases inherited. Genetic testing has helped predict the location of gene mutations. Cancer can be linked to mutations of tumor suppressor genes called BRCA1 and BRCA2 genes. The Human Genome Project has been very successful on mapping the entire sequence of DNA. The next step is to understand each and every gene in our bodies. As we start to develop better technology, our medications and testing becomes more accurate.