text:  There are many known factors that affect survivorship, including poverty, a patient's insurance, and proximity to care. But McCullough says there's a part of the puzzle that we don't yet know. Many of the factors can seemingly be attributed to low income, but research shows that even in higher socioeconomic neighborhoods, the disparities are still obvious. And so there's a lot that we don't know about the presence of comorbid conditions, which may impact treatment.