More than 54,000 professional pesticide users participated in a 5 year study relating Glycophosate, or Roundup, to non Hodgkin lymphoma. No significant  association has been found. However,there may be a link to multiple myeloma and glycophosate exposure.

Multiple myeloma is a blood cancer developing in the bone marrow. Normal plasma cells become malignant myeloma cells, producing abnormal B cell antibodies. Typically, it forms bone lesions, affects more men and is incurable to date. Patients last 7 months without treatment.  Various chemotherapy, thalidomide and stem cell transplants may result in a 5 year survival rate. Exposure to horticultural pesticides, which now may include Roundup, are most likely associated with multiple myeloma. Bakers and pastry chefs are also at high risk due to fungal and flour dust.

National Journal of Cancer, 2017