What should people do if diagnosed with a benzene-related disease?

Benzene. Avoid future exposure. Benzene have some correlation with some cancers. Notify your doctor about this.
Benzene. Benzene poisoning is treated with supportive medical care in a hospital setting. No specific antidote exists for benzene poisoning. The most important thing is for victims to seek medical treatment as soon as possible. Go to the cdc link to find out more.... http://www.bt.cdc.gov/agent/benzene/basics/facts.asp.