title: Association between obesity and the risk of malignant lymphoma in Japanese: a case-control study.
abstract: Although marked differences in anthropometric characteristics and malignant lymphoma (ML) incidence suggest that the association between obesity and ML risk in Asian and non-Asian populations may differ, few studies have investigated this association in Asian populations. Here, we conducted a sex- and age-matched case-control study in a Japanese population using 782 cases and 3,910 noncancer controls in the hospital-based Epidemiological Research Program at Aichi Cancer Center Hospital. Odds ratios (ORs) and 95% confidence intervals (CIs) for anthropometric characteristics were estimated using a conditional logistic regression model that incorporated smoking and alcohol intake. Recent body weight and body mass index (BMI) showed marginally significant association with ML risk (ORs [95% CIs] per 5-unit increase in recent weight and BMI; 1.04 [0.99-1.09] and 1.11 [0.98-1.27], respectively). On the other hand, weight and BMI in early adulthood exhibited a strong association with ML risk (ORs [95% CIs] per 5-unit increase in early adulthood weight and BMI; 1.11 [1.05-1.18] and 1.33 [1.13-1.55], respectively). Further, in women, a BMI of 25.0-29.9 kg/m(2), defined as obesity in Asian populations, during early adulthood was significantly associated with ML risk compared to the normal range of 18.5-22.9 kg/m(2). By histological ML subtype, the point estimates of ORs for obesity relative to normal weight in early adulthood were over unity for non-Hodgkin lymphoma (NHL) as a whole and significant for diffuse large B-cell lymphoma (DLBCL). In conclusion, our study in Japanese subjects suggested that early adulthood obesity is associated with the risk of NHL, particularly DLBCL.
authors.affiliation: Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan.
authors.forename: Junya
authors.initials: J
authors.lastname: Kanda
authors.forename: Keitaro
authors.initials: K
authors.lastname: Matsuo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Satoyo
authors.initials: S
authors.lastname: Hosono
authors.forename: Hidemi
authors.initials: H
authors.lastname: Ito
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Ichinohe
authors.forename: Masao
authors.initials: M
authors.lastname: Seto
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Morishima
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tajima
authors.forename: Hideo
authors.initials: H
authors.lastname: Tanaka
mesh_terms: D000328:Adult; D017677:Age Distribution; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000706:statistics & numerical data*; D015992:Body Mass Index; D001835:Body Weight; D016022:Case-Control Studies; D016001:Confidence Intervals; D005260:Female; D006689:Hodgkin Disease / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D007564:Japan / Q000453:epidemiology; D016015:Logistic Models; D008223:Lymphoma / Q000453:epidemiology* / Q000209:etiology*; D008228:Lymphoma, Non-Hodgkin / Q000453:epidemiology / Q000209:etiology; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications*; D016017:Odds Ratio; D018570:Risk Assessment; D012307:Risk Factors; D017678:Sex Distribution; D055815:Young Adult