RET

ret is a term that can refer to different concepts across disciplines. In computing, ret is the mnemonic for a return instruction in many assembly languages, notably x86. The instruction transfers execution back to the address on the top of the stack, effectively returning from a subroutine. Some variants adjust the stack after returning (for example, specifying an immediate value to add to the stack pointer).

In genetics, RET refers to the RET proto-oncogene, which encodes a receptor tyrosine kinase involved in signaling pathways that regulate cell growth and differentiation. It plays an essential role in the development of neural crest–derived tissues, the enteric nervous system, and the kidneys. Mutations in RET are linked to multiple endocrine neoplasia type 2 (MEN2), familial medullary thyroid carcinoma, and Hirschsprung disease. Therapeutic approaches include targeted tyrosine kinase inhibitors for certain RET-mutant cancers.

In short, ret is a polysemous term; the intended meaning is determined by context.