This was confirmed later when animal testing found it to cause benign and malignant tumors in the mammary glands, stomachs, esophagi, and lungs of rodents of both sexes, although insufficient evidence exists in human exposure.
Further investigation confirmed that this substance led to the development of benign and malignant tumors in the mammary glands, stomachs, esophagi, and lungs of both male and female rodents, although there is limited evidence to suggest a similar effect in humans.