LAUSR

1532 Background: In tandem with the Choosing Wisely initiative, ASCO’s Cost of Care Task Force has proposed a list of low-value (LV) procedures and therapies that may be of limited benefit to patients. Myelodysplastic syndrome (MDS) is the most common myeloid malignancy in the US. A complete diagnostic evaluation (CDE) of MDS requires a bone marrow biopsy, fluorescence in situ hybridization and chromosomal analysis. As a potential LV procedure, we evaluated receipt of CDE in MDS patients with isolated or no cytopenias and no transfusion dependence. Methods: Using national 2011-2014 Medicare data, we identified fee-for-service Medicare patients 66 years of age or older with an MDS diagnosis, one or no cytopenias, and no blood transfusions in the 16 weeks before or after an MDS diagnosis (n = 16,779). We examined the following variables that may have provided a clinical context to (or not to) pursue CDE – demographics (age, race, sex); number of Elixhauser comorbid conditions ( < 5 vs >5); nursing home status, prior history of lymphoma, myeloma, MGUS and other cancers; chronic kidney disease (CKD); colonoscopy; and therapies received including erythropoiesis stimulating agents (ESAs), hypomethylating agents (HMAs) or lenalidomide. We conducted Classification and Regression Tree (CART) analysis, a machine learning approach to identify combinations of factors in patients with little clinical justification for CDE, and Cox proportional hazards regression analysis to compare survival outcomes between those with or without CDE. Results: Over half of our study population (51%) received CDE. Of those, 46.6% were 80 years of age or older, 4.8% were nursing home residents; and 33.6% had 5 or more chronic conditions. Results from CART analysis showed that among patients with an isolated cytopenia (e.g., isolated anemia), 46.0% of patients >80 years (n = 860), and 57.7% (n = 1,156) of those in the 66-79 age group underwent CDE in the absence of CKD, colonoscopy, HMA, or ESA. Among those with no cytopenia (n = 3890), 866 patients received CDE in the absence of HMA, ESA, or history of lymphoma or progression to leukemia. In adjusted analyses, no survival benefit was associated with receipt of CDE (p = 0.24). Conclusions: A substantial number of patients with an MDS diagnosis, isolated or no cytopenias, and no transfusion dependence received a CDE in the absence of other diagnoses, procedures, or therapies that may have explained the clinical decision to perform CDE. These procedures entail costs, pain and anxiety, but do not appear to yield useful information to guide clinical management, as evidenced by the comparable survival outcomes between patients who did and did not undergo CDE. To promote patient-centered care, careful patient selection that reduces unnecessary CDE in MDS patients should be a priority in clinical decision-making.