PDE4 and Epac1 Synergistically Promote Rectal Carcinoma via the cAMP Pathway

Table 2

Correlation between PDE4 and Epac1 protein levels in rectal cancer.

Epac1	PDE4
	−	+−	+	++	+++
−	5	1	1	1	0	0.419	0.005
+−	3	4	5	0	0
+	2	0	5	3	1
++	0	1	3	5	0
+++	1	1	2	0	0

Note: is the spearman rank correlation coefficient.