Table 2.

Risk Factors for Indolent B-Cell NHL

Factors that Increase Risk of LPL/WM	Factors that Decrease Risk of LPL/WM
Sjögren’s syndrome	Hay fever
Systemic lupus erythematosus	Increased adult weight (Q4)
HCV infection
1st degree family history of any hematologic malignancy
Cigarette smoking for ≥ 40 years
Employed as a medical doctor
Factors that Increase Risk of FL	Factors that Decrease Risk of FL
1st degree family history of NHL	Any atopic disorder
High BMI as a young adult	Prior blood transfusion
Employed as a spray painter	Increased sun exposure
Sjögren’s syndrome (female)	Employed as:  baker or miller  university/higher education teacher
Cigarette smoking (female)	Alcohol consumption (female)
Factors that Increase Risk of CLL/SLL	Factors that Decrease Risk of CLL/SLL
1st degree family history of any hematologic malignancy	Any atopic disorder
HCV infection	Prior blood transfusion
Occupation or residence on a farm	Increased sun exposure
Employed as a hairdresser
Increased height
Factors that Increase Risk of MZL	Factors that Decrease Risk of MZL
B-cell activating conditions	Alcohol consumption
HCV infection	Employed as a teacher
Peptic ulcers
Asthma without other atopic condition
1st degree family history of any hematologic malignancy
Hair dye use
Employed as a metal worker
Factors that Increase Risk of MCL	Factors that Decrease Risk of MCL
1st degree family history of any hematologic malignancy	Any atopic disorder
Residence on a farm

Note: NHL=non-Hodgkin lymphoma, MZL=marginal zone lymphoma, HL=Hodgkin lymphoma, SLL/CLL=small lymphocytic lymphoma/chronic lymphocytic leukemia, Q4=4^th quartile, cm=centimeters, FL=follicular lymphoma, BMI=body mass index, kg=kilograms, m²=meters squared, LPL/WM=lymphoplasmacytic lymphoma/Waldenstrom’s macroglobulinemia, Q2=2^nd quartile, Q3=3^rd quartile.