MMP9 and lip and oral cavity carcinoma: MMP-9 rs3918242 was associated with BC risk in all populations under the dominant model, GC risk in Asians under the recessive model, HCC risk in all populations under the recessive model, LC risk among the Caucasian and overall populations in the recessive and allelic models, and oral cancer risk in all populations under the allelic model (see Table 1).