Since the above analysis showed that the two keloid-related genes, HIF1A and MMP2, co-occurred in the literature that mentioned the keywords 'hypoxia' and 'fibroblast' but not in the literature that mentioned the keyword 'keloid', HIF1A and MMP2 might be involved in an unknown pathway that is abnormal in keloids. The gene discussed is HIF1A; the disease is keloid.