Subsequently, an optimal prognostic signature involving 4 lncRNAs (AC138430.1, AGAP2-AS1, AP001783.1, and AP005233.2) was constructed using multivariate Cox regression analysis, of which the lncRNAs AGAP2-AS1 and AP005233.2 were upregulated, whereas the lncRNAs AC138430.1 and AP001783.1 were downregulated in tumour tissues. This evidence concerns the gene AGAP2 and neoplasm.