Despite the mechanisms interplaying between cancer cells and fibrinogen remains unknown, it has been observed that interleukin-6, produced by lung cancer cells, induced fibrinogen secretion [24], while in vitro tests showed that cancer cells also synthesise fibrinogen promoting tumour cell growth and angiogenesis due to the interaction with other fibroblast and vascular endothelial growth factors [25]. Here, IL6 is linked to lung cancer.