TY - GEN
T1 - Comorbidity and survival in chronic lymphocytic leukemia
AU - Rotbain, Emelie
PY - 2021/12/13
Y1 - 2021/12/13
N2 - Chronic lymphocytic leukemia (CLL) is a cancer of the blood, secondary lymphoid tissue (lymph nodes, spleen) and bone marrow. Approximately 450 individuals are diagnosed with CLL yearly in Denmark. Most newly diagnosed CLL patients do not have any symptoms, and therefore do not need treatment at the time of diagnosis. However, many patients with CLL require therapy during the following years. There are several types of treatment for CLL including chemotherapy, immunotherapy, and targeted agents, and the choice of treatment depends on age, other chronic conditions (comorbidities), prognostic factors, patient preferences, and previous treatment.This thesis includes four studies of different aspects of treatment, survival, use of the healthcare system, and comorbidity for patients with CLL. All studies are based on data from Danish nationwide registers and some also include data from patient records.In study I, variation in survival and need for renewed treatment in patients by the prognostic factor immunoglobulin variable heavy chain (IGHV) mutational status and by type of treatment was studied. The results showed that patients receiving intensive chemoimmunotherapy generally had a long survival and that patients with mutated IGHV had a superior prognosis. Next, in study II, the importance of 11 different comorbidities in CLL was examined. Over a third of all patients with CLL had one or more comorbidity at diagnosis of CLL and all comorbid conditions were associated with a shorter survival. In study III, using the new CLL comorbidity index, patients were categorized as low, intermediate, or high risk based on the presence or absence of three types of comorbidities: upper gastrointestinal disease, vascular disease, and endocrinological disease. The results showed that the CLL comorbidity index was associated with survival and treatment outcomes in patients both at diagnosis and at first treatment.Finally, in study IV, use of the healthcare system was studied in terms of hospital and emergency room admissions, out-patient clinic visits, and use of prescription drugs. The study showed that patients had an increased healthcare utilization after diagnosis of CLL and that patients with comorbid conditions used the healthcare system more than patients without comorbidities.
AB - Chronic lymphocytic leukemia (CLL) is a cancer of the blood, secondary lymphoid tissue (lymph nodes, spleen) and bone marrow. Approximately 450 individuals are diagnosed with CLL yearly in Denmark. Most newly diagnosed CLL patients do not have any symptoms, and therefore do not need treatment at the time of diagnosis. However, many patients with CLL require therapy during the following years. There are several types of treatment for CLL including chemotherapy, immunotherapy, and targeted agents, and the choice of treatment depends on age, other chronic conditions (comorbidities), prognostic factors, patient preferences, and previous treatment.This thesis includes four studies of different aspects of treatment, survival, use of the healthcare system, and comorbidity for patients with CLL. All studies are based on data from Danish nationwide registers and some also include data from patient records.In study I, variation in survival and need for renewed treatment in patients by the prognostic factor immunoglobulin variable heavy chain (IGHV) mutational status and by type of treatment was studied. The results showed that patients receiving intensive chemoimmunotherapy generally had a long survival and that patients with mutated IGHV had a superior prognosis. Next, in study II, the importance of 11 different comorbidities in CLL was examined. Over a third of all patients with CLL had one or more comorbidity at diagnosis of CLL and all comorbid conditions were associated with a shorter survival. In study III, using the new CLL comorbidity index, patients were categorized as low, intermediate, or high risk based on the presence or absence of three types of comorbidities: upper gastrointestinal disease, vascular disease, and endocrinological disease. The results showed that the CLL comorbidity index was associated with survival and treatment outcomes in patients both at diagnosis and at first treatment.Finally, in study IV, use of the healthcare system was studied in terms of hospital and emergency room admissions, out-patient clinic visits, and use of prescription drugs. The study showed that patients had an increased healthcare utilization after diagnosis of CLL and that patients with comorbid conditions used the healthcare system more than patients without comorbidities.
U2 - 10.21996/p290-y807
DO - 10.21996/p290-y807
M3 - Ph.D. thesis
PB - Syddansk Universitet. Det Sundhedsvidenskabelige Fakultet
ER -