Final answer:
The hypothesized etiology of lymphomas includes viral infections and oncogene activation, with viral infections being a commonly suspected factor.
Step-by-step explanation:
The main etiology of lymphomas is not fully understood; however, viral infections are one of the hypothesized etiologies. Lymphomas are cancers of the lymphatic system, more specifically involving the malignant growth of T and/or B lymphocytes that can accumulate in lymph nodes, the spleen, and other organs. Factors contributing to the development of lymphomas may include genetics, environmental factors, and various infections, of which viral infections are commonly suspected. Oncogene activation has also been implicated in the etiology of lymphomas, as it can lead to the uncontrolled growth of cells that may contribute to the development of cancer.