Resting-state functional connectivity(FC) analyses using a subcallosal cingulate cortex(SCC) seed was applied to major depressive disorder(MDD) patients to characterize a potential neuro-imaging biomarker that identifies the treatment outcome. MDD patients were divided into refractory and non-refractory group according to the treatment response. We found distinguished FC alterations between the three groups especially the lack of FC between SCC and Anterior Cingulate Cortex in the refractory MDD patients. In addition, the alterations in FC correlated with clinical symptoms in different ways in two MDD groups.
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