PA increased the invasiveness of AsPC-1 pancreatic cancer cells via the TLR-4/ROS/NF-κB/matrix metalloproteinase-9 (MMP-9) signalling pathway [148] and promoted metastasis in several human oral carcinoma cell lines expressing high levels of cluster of differentiation 36 (CD36) [149]. Here, MMP9 is linked to lip and oral cavity carcinoma.