Greater expectations: meeting clinical needs through broad and rapid genomic testing.

Cancer describes a group of diseases driven by genetic and genomic changes that can occur across hundreds of different genes. Knowledge of the specific variants present in a patient's cancer can help to predict response to different treatment options, confirm disease diagnosis, and understand a patient's prognosis and risks, which ultimately leads to improved survival outcomes. The advent of next-generation sequencing (NGS) technology has allowed pathologists to simultaneously profile the sequences of many genes in a single reaction, but not all NGS assays are built the same. While those used for broad genomic profiling are useful to probe large regions of the genome and gather more information about a patient's tumor, it comes at the cost of relatively long turnaround times (TAT), which may be detrimental to patient care. Conversely, NGS assays used for rapid genomic profiling provide faster results, but may miss detection of variants that are clinically informative. Determining which type of genomic profiling to order depends on a number of factors including the severity of a patient's illness, standard of care paradigms, and success or failure of previous therapies. Ultimately, the ideal clinical diagnostic laboratory will be able to offer both options to best meet the clinical needs of its patients.