ImmunoMRI for Assessment of Tumor-associated Macrophages

"1. Ferumoxytol will be injected as an off-label MRI contrast agent at a dose of 4 mg/kg body mass. For safety (in accordance with prior research), ferumoxytol will be diluted 1:4 in saline, and administered slowly over at least 15 minutes, with patient monitoring during and post injection.~2. ImmunoMRI will be performed using an iron sensitive fat-suppressed, fast spoiled gradient echo T2\* mapping sequence. At each time point (i.e. pre-treatment and post-treatment), T2\* mapping will be performed before and \~24h after ferumoxytol injection."