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Intratumoral distribution of AF790-albumin was assessed in vivo using near-infrared (NIR) fluorescence imaging. Albumin retention was observed as a function of K-RAS activity and macropinocytosis across several lung and pancreatic cancer cell lines. We documented that ARS-1620-induced inhibition of K-RAS activity or amiloride-mediated inhibition of macropinocytosis significantly reduced albumin uptake. Tumor retention in vivo of AF790-albumin was both RAS inhibition-dependent as well as abrogated by inhibition of macropinocytosis. These da