Non-Hodgkin's disease comes from B cells, T-cells or Null cells. The type of non-Hodgkin's lymphoma a person has is called after the cell type it came from. So, a person may have a T-cell non-Hodgkin's lymphoma. This would be a cancer tumour that has developed form the T-cells in the lymph glands dividing uncontrollably to create a tumour.