Patients with HL do have some immune suppression because of the disease and have a higher risk of getting certain infections.

CNN: What is Hodgkin lymphoma's effect on the lymphatic system?

But some companies appear to have engaged in suppression of data showing a drug is dangerous or ineffective, sometimes with deadly results.

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Safety concerns about lithium ion batteries as cargo recently prompted some airlines to begin isolating shipments and enhancing fire suppression.

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Patients who are successfully treated for HL continue to have this immune suppression and long term have a higher risk of leukemia and some other cancers because of their therapy.

CNN: What is Hodgkin lymphoma's effect on the lymphatic system?