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Varian Medical Systems, acquired by Siemens Healthineers in 2021 for $16.4 billion, provides specialized oncology information systems centered around its ARIA Oncology Information System platform. The company serves radiation oncology departments, medical oncology practices, cancer centers, and academic medical institutions worldwide, with systems installed in over 10,000 treatment centers across more than 140 countries. ARIA serves as Varian's flagship EMR/OIS platform, designed specifically f