PHILADELPHIA (WPVI) -- Driving through Center City Monday evening, you might have noticed the message scrolling across the PECO crown lights.
Monday was the first ever World Castleman Disease Day.
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Not much is known about the disease that was discovered more than 60 years ago.
It is a rare condition that affects the lymph nodes and treatment can include chemotherapy or radiation.
There are approximately 6,500 cases of Castleman disease diagnosed every year in the US.
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