Figure 4

Validation study of cancer subtype associated lncRNAs.
(a). The number of cancer subtype associated lncRNAs (intersection) confirmed by an independent validation set (pink). (b). Principal-component analysis (PCA) of cancer subtype associated lncRNAs for lung adenocarcinoma and squamous cell carcinoma samples. PCA1, PCA2 and PCA3 represent the top three dimensions of cancer subtype associated lncRNA genes.