Lymphomas are malignant tumors
developed from one of the cellular elements constituting the lymphoid tissue. They are groups into two groups:
non-Hodgkin's lymphoma and Hodgkin's lymphoma. Non-Hodgkin's lymphoma represents approximately 85% of lymphomas.
Each year, non-Hodgkin's
lymphoma affects around 10 people per million worldwide. According to the National Cancer Institute (NCI), it is
estimated that 65,980
men and women were diagnosed with lymphoma in
the United States in 2009; about 19,500
people died of the disease.
The incidence of lymphoma
(non-Hodgkin's lymphoma and Hodgkin's lymphoma combined) varies with age. From 2002-2006, the median age at
diagnosis for lymphoma was 64 years of age; the percentages and ages of people diagnosed were
under age 20;
between 20 and 34;
between 35 and 44;
between 45 and 54;
between 55 and 64;
between 65 and 74;
between 75 and 84;
- 7.8% 85+
years of age.