Disease progression refers to the natural course and evolution of a disease within an individual over time. This research area focuses on understanding the factors that influence the development and worsening of a disease, as well as identifying markers or predictors of progression. By studying disease progression, researchers aim to improve diagnosis, treatment, and outcomes for patients by developing interventions that can slow or halt the progression of the disease. This field of study is essential for advancing our knowledge of various diseases and ultimately improving patient care.