Two subclasses of lung squamous cell carcinoma with different gene expression profiles and prognosis identified by hierarchical clustering and non-negative matrix factorization.

Inamura K, Fujiwara T, Hoshida Y, Isagawa T, Jones MH, Virtanen C, Shimane M, Satoh Y, Okumura S, Nakagawa K, Tsuchiya E, Ishikawa S, Aburatani H, Nomura H, Ishikawa Y.Oncogene. 2005 Oct 27;24(47):7105-13. doi: 10.1038/sj.onc.1208858