Efficacy of Ferric Carboxymaltose in Gastrointestinal Stromal Tumor (GIST) Patients With Iron Deficiency Anemia (IDA) Receiving Systemic Therapy

The goal of this clinical research study is to compare Injectafer® (ferric carboxymaltose) with an iron supplement to learn which may be more effective in improving red blood cell counts in patients who have iron-deficiency anemia (a low red blood cell count) because of a gastrointestinal stromal tumor (GIST) and/or systemic therapy. The safety of ferric carboxymaltose will also be studied. This is an investigational study. Ferric carboxymaltose is FDA approved and commercially available to treat iron deficiency anemia; however, it is considered investigational to use in patients who have cancer-related or systemic therapy-related anemia. Up to 50 participants will take part in this study. All will be enrolled at MD Anderson.