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Mortality from breast cancer is almost entirely the result of invasion and metastasis of neoplastic cells; therefore, understanding gene products involved in breast cancer metastasis is an important research goal.Prompted by a recent study showing increased expression of a DEAD-box family member, DDX20, in microarray data from lymphoma patients, a total of 194 breast tissue samples (97 breast cancers and 97 paired normal breast tissue) were retrieved.