Her study identified in Texas Medicare records 67,582 unique women aged 66 years or older who underwent 75,518 unique breast mass episodes during 2001-2008, including 49,653 (66%) of masses that underwent MIBB and 25,865 (34%) that underwent open surgical biopsy. Use of MIBB rose steadily during the period, starting at 44% of masses in 2001 and increasing to 79% by 2008.
Analysis of MIBB use by Medicare health service area showed stark geographic disparities, with MIBB use as low as 21% in one HSA. During 2005-2008, MIBB use remained at 40% or less in several HSA along the Rio Grande border and in East Texas, including the HSAs in the south Texas towns of McAllen and Harlingen. In contrast, the HSA immediately adjacent to these that includes Brownsville had a MIBB rate greater than 70%. The analysis also showed than many of the HSAs with the lowest rates of MIBB use were located in Texas regions with high Hispanic populations, Dr. Riall said.
Dr. Riall and Dr. Grobmyer had no disclosures.