Causes of death in patients with malignant adrenal tumours: a population-based analysis.
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OBJECTIVE: This study aimed to characterize the causes of death and compute the risk of mortality due to each cause among patients with malignant adrenal tumours. METHODS: Data from malignant adrenal tumour patients were collected from the Surveillance, Epidemiology, and End Results (SEER) database (2004-2020). With reference data from the general population, the standardized mortality ratio (SMR) was calculated to assess all causes of death for malignant adrenal tumour patients. RESULTS: A total of 1651 patients who died from primary malignant adrenal neoplasms were included; 854 cases of adrenocortical carcinoma (ACC)-related death, 118 cases of pheochromocytoma (PCC)-related death and 333 cases of neuroblastoma (NB)-related death were identified for further analysis. Approximately 56.78%~87.69% of patients died from primary malignant adrenal tumours, 7.21%~13.56% died from secondary malignant neoplasms (SMNs), and 5.11%~29.66% died from noncancer diseases. The main causes of death associated with SMNs included lung and bronchial cancer and soft tissue cancers, including heart, kidney and renal pelvis cancers; the noncancer causes of death included mainly heart disease, septicemia, and cerebrovascular disease. Compared with chemotherapy-naïve patients, chemotherapy-treated patients had higher SMRs of SMNs, including cancers of the colon (excluding the rectum), lung, bronchus, bones and joints; soft tissues, including the heart, kidney and renal pelvis; the brain and peripheral nervous system; and leukaemia, as well as nontumor diseases, including heart disease, septicemia, and cerebrovascular disease. Patients with NB were more likely to die from SMNs, including soft-tissue malignancies of the heart, bones and joints; brain; peripheral nervous system; the female genital system, including the ovary; leukaemia, including lymphocytic leukaemia; myeloid and monocytic leukaemia; and lymphoma, including non-Hodgkin lymphoma. CONCLUSION: In addition to primary cancer, SMNs and nontumor diseases were important causes of death in patients with malignant adrenal tumours. Neuroblastoma patients and chemotherapy- treated patients are more likely to die from SMNs and should monitored closely.