Sanofi develops and markets drugs with a concentration in oncology, immunology, cardiovascular disease, diabetes, and vaccines. However, the company's decision in late 2019 to pull back from the cardio-metabolic area will likely reduce the firm's footprint in this large therapeutic area. The company offers a diverse array of drugs with its highest revenue generator, Lantus, representing just under 10% of total sales. About 30% of total revenue comes from the United States and 25% from Europe. Emerging markets represent the majority of the remainder of sales.