CPT® Code 81272

KIT (v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog) (eg, gastrointestinal stromal tumor [GIST], acute myeloid leukemia, melanoma), gene analysis, targeted sequence analysis (eg, exons 8, 11, 13, 17, 18)

The CPT® Code 81272 pertains to molecular genetic testing specifically aimed at analyzing the KIT (v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog) gene. This gene is crucial in various oncological conditions, including gastrointestinal stromal tumors (GIST), acute myeloid leukemia, and melanoma. The testing involves targeted sequence analysis of specific exons—namely exons 8, 11, 13, 17, and 18—located on chromosome 4. The KIT gene encodes a receptor protein that is part of the tyrosine kinase family, which plays a vital role in signal transduction. This process is initiated when a stem cell factor binds to the receptor, leading to the activation of intracellular proteins through phosphorylation. This activation cascade is essential for various cellular functions, including proliferation, survival, and migration, particularly in germ cells, hematopoietic stem cells, mast cells, gastrointestinal cells, and melanocytes. Mutations in the KIT gene are linked to several conditions, such as piebaldism, GIST, acute myeloid leukemia, sinonasal natural killer/T-cell lymphoma (NKTCL), and melanoma. The purpose of conducting genetic testing on the KIT gene is to identify specific mutations in patients diagnosed with these cancers, which can provide critical information regarding prognosis and the potential response or resistance to targeted cancer therapies.