CXCR4 and Miyoshi myopathy: Thus, given the high contrast obtained in [68Ga]Pentixafor PET between low endogenous CXCR4 expression and pathological CXCR4 overexpression of positive MM lesions, this imaging methodology may allow for selecting patients for CXCR4-directed treatment, such as radionuclide or toxin-labeled Pentixafor analogs.