I am curious about prognostic value analysis: A gene that is known to stimulate metastasis etc.. is upregulated in breast cancer, however, when i make a kaplan-meier analysis to acess the possible correlation with Disease-Free survival (DFS) or overall survival (OS), the result shows that low expression of this gene is correlated to worse DFS and OS... How can i interpretate this? The gene is upregulated, causing metastasis, but low expression correlates with poor survival?