Iron Replacement to Reduce Anemia During Neoadjuvant Chemotherapy

Inclusion Criteria: * Male or female patients \> 18 years * Patients undergoing neoadjuvant chemotherapy, including radiation and/or immunotherapy, with intent for curative surgical resection for breast, thoracic, gastrointestinal (GI) or genitourinary (GU) malignancies. * Anemia defined as Hgb \<10.5 g/dL during chemotherapy. * Iron storage levels of ferritin \<500 ng/mL and iron saturation \<35% * Ability to understand and willingness to sign a written informed consent and HIPAA consent document Exclusion Criteria: * Diagnosis of anemia at the time of cycle 1 day 1 of neoadjuvant chemotherapy, Hgb \< 11.0 g/dL, uncontrolled intercurrent illness including, but not limited to, ongoing active infection, symptomatic new/exacerbated congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements * Prior parenteral iron infusion in the past 4 weeks * The use of erythropoietin stimulating agents within 4 weeks unless chronic needs due to CKD * Concurrent systemic infection at the time of enrollment. * Known hypersensitivity to Iron sucrose * Pregnant or breast feeding. Refer to section 4.4 for further detail. * Anemia from another established etiology (i.e MDS, Myeloma)