CXCR4 and marginal zone lymphoma: Kosmala et al. [126] used CXCR4[68Ga]Ga-PentixaFor PET/CT imaging to detect the potential “lymphoma sink effect” in patients with marginal zone lymphoma (MZL), but unfortunately, this study showed no association between normal organ uptake and the CXCR4-positive lymphoma burden in MZL patients, suggesting that the lymphoma sink effect of MZL may not be significant relative to other therapeutic radiotracers used for the imaging and treatment of solid tumors.