[A paired case-control study for assessing the relationship between the incidence of malignant lymphomas and the viruses infections].

Objective: To evaluate the relationships between the viruses infections and the incidence of malignant lymphomas (ML) in Sichuan province.

Methods: A hospital-based paired case-control study was designed with two controls per case. The case group comprised 97 cases diagnosed as ML by pathological examination; the control group A consisted of 194 subjects randomly selected from those with non-malignancies by matching on both gender and age in the corresponding period.

[A case-control study for assessing the relation between the incidence of malignant lymphomas and environmental factors in Sichuan province].

Objective: To evaluate the relationships of malignant lymphoma (ML) and exposure factors, including environmental, drug using, socioeconomic level and life style etc.

Methods: (1) Hospital-based case-control study with 1:2 matching was used; (2) 150 cases of ML and 300 controls were resulted; (3) logistic regression was used.

Results: (1) Adjust odds ratios (aOR) regarding contact to organic solvents were: benzene aOR = 2.