Moreover, when human colon cancer cell line HT-29 was treated with Tα1 or Tα1-iRGD at doses that ranged from 0.03125 μmol/mL to 0.5000 μmol/mL (Figure 5D), Tα1-iRGD also exhibited significantly higher antiproliferative activity than Tα1. This evidence concerns the gene TAAR1 and malignant colon neoplasm.