choices and outcomes. In a population-based sample of 1,800 breast cancer patients diagnosed in 1992, the prevalence of one or more comorbid conditions increased from roughly 15 percent at ages 55 to 59 to more than 40 percent among women aged 85 and older (Figure 2-23) (Yancik et al., 2001b). The most prevalent condition in all age groups was hypertension. Arthritis ranked second or third across all age groups. The proportion of patients with previous cancers increased by age: 11 percent for those aged 55 to 64 years, 14 percent for those aged 65 to 74 years, and 20 percent for patients aged 75 and older.