TACSTD2, also known as tumor-associated calcium signal transducer 2, is an identified cell surface glycoprotein highly expressed by human carcinomas. It is detected in normal kidney, lung, ovary and testis, similarly to the human gene. It is undetectable in undifferentiated spindle cell carcinomas, this suggests a preferential expression at early stages of tumor progression. Its inhibition suppresses the proliferation and invasion of laryngeal carcinoma cells via the extracellular signal-regulated kinase/mitogen-activated protein kinase pathway. Recombinant human TACSTD2, fused to His-tag at C-terminus, was expressed in insect cell and purified by using conventional chromatography techniques.