B Symptoms in Lymphoma

Clinical Definition and Components

The National Comprehensive Cancer Network defines B symptoms in lymphoma as a triad of constitutional symptoms consisting of unexplained fever >38°C (>101°F), drenching night sweats requiring changing of clothes or bedding, and unexplained weight loss of >10% of body weight within 6 months of diagnosis 1, 2
B symptoms include fever, defined as unexplained temperature >38°C (>101°F) 1, 2
B symptoms include night sweats, defined as drenching sweats severe enough to require changing clothes or bedding 2
B symptoms include weight loss, defined as unexplained loss of >10% of body weight within the 6 months preceding diagnosis 1, 2

B symptoms serve as critical indicators for treatment initiation and prognostic stratification in lymphoma management, according to the Annals of Oncology 3, 4, 5

The Annals of Oncology recommends therapy initiation when B symptoms develop, even in otherwise asymptomatic patients with advanced disease 3
The Annals of Oncology suggests other indications for treatment include hematopoietic impairment, bulky disease, vital organ compression, ascites, pleural effusion, or rapid lymphoma progression 3, 4, 5
The Annals of Oncology states that in the absence of B symptoms and other concerning features, watch-and-wait remains the standard approach for asymptomatic advanced follicular lymphoma 3

In Hodgkin lymphoma, B symptoms are more common and are incorporated into the Ann Arbor staging system, where "B" designation indicates presence of these symptoms and "A" indicates their absence 1, 2

The Ann Arbor staging system formally incorporates B symptoms, with each stage (I-IV) subdivided into "A" (absence of B symptoms) or "B" (presence of B symptoms) 1, 2
This classification directly influences treatment decisions and prognostic assessment, according to the National Comprehensive Cancer Network 1, 2

The Annals of Oncology recommends considering histologic transformation to aggressive lymphoma (requires repeat biopsy) when B symptoms appear in a patient with known indolent lymphoma 3, 4, 5
The Annals of Oncology suggests considering disease progression requiring treatment initiation when B symptoms appear in a patient with known indolent lymphoma 3
Hodgkin lymphoma more commonly presents with B symptoms compared to non-Hodgkin lymphoma, particularly in young adults and older adults (bimodal age distribution), according to Praxis Medical Insights 2