A. Alterations in androgen signaling components where frequencies are shown for AR and selected activators in primary and metastatic tumors. Alterations are defined as those having outlier expression (as described in Figure 1B and Experimental Procedures), or by somatic mutations, and interpreted as activation (red) or inactivation (blue). B. Overall genomic alteration rates in androgen signaling genes. The eleven genes in the AR pathway (panel A) had somatic mutations (black, red) and/or outlier expression (over- or under-expression, see Experimental Procedures), a subset of which was the result of copy-number alterations (gray, broad and focal gain or loss of one or more copies, see Supplementary Information). Primary tumors show moderate levels of alteration in at least one of these eleven AR pathway genes (left), preceding the generally higher alteration rates in metastatic tumors (right). C. The steroid receptor co-activator NCOA2 had two novel somatic point mutations in primary tumors. These clustered near sites of known NCOA2 point mutations in melanoma [G435S in the serine/threonine-rich (S/T) regulatory domain] and lung cancer [S1024N in the transcriptional activation domain 1 (AD1)]. D. Increasing levels of NCOA2 induce increasing androgen-dependent AR transcriptional activity. Increasing amounts of NCOA2 plasmid were transfected into LNCaP cells, resulting in NCOA2 protein expression (inset western blot) and ARE-luciferase reporter activity. Error bars representing the S.E.M (standard error of the mean) are displayed, but represent a very small portion of the signal, and are therefore not visible. E. Non-castrate primary tumors with NCOA2 gain (defined as copy-number amplification greater than single-copy gain, outlier over-expression, or mutation) have higher androgen signaling (student’s t-test, P<0.0001), as assessed by an independent signature of 29 androgen-responsive genes (Hieronymus et al., 2006). See also Figure S2.