Factors and Considerations in No-Treatment Decisions in Patients With Key Hematological Malignancies: A Nationwide, Population-Based Study in the Netherlands.

Comprehensive insights are lacking into why patients with hematological malignancies (HMs) receive no cancer-directed treatment. We evaluated socio-demographic and cancer-related characteristics, decision-making rationales, and overall survival in patients with three common HMs-diffuse large B-cell lymphoma (DLBCL), symptomatic multiple myeloma (MM), and acute myeloid leukemia (AML)-who do not receive cancer-directed treatment, using the nationwide Netherlands Cancer Registry. A total of 26 945 patients diagnosed with DLBCL (47%), symptomatic MM (29%), or AML (25%) between 2014 and 2021 were included. About 16% of the patients did not receive cancer-directed treatment, ranging from 26% in AML to 15% in DLBCL and 10% in MM. The primary reason for not receiving cancer-directed treatment in all three HMs was related to physical condition. The second main reason was patient/family choice in DLBCL and MM, whereas in AML it was rapid disease progression. In female patients, patient/family choice was a more prevalent reason for not receiving cancer-directed treatment than in male patients. Patients with a lower socio-economic position more often did not receive cancer-directed treatment. Median OS varied by reason for not receiving cancer-directed treatment, with the shortest OS in patients experiencing rapid disease progression or death before treatment initiation (0·4 to 0·6 months).