Back in 2017 John Andretti revealed that he had been diagnosed with cancer. According to AutoWeek, he had to have a portion of his colon removed.

Sadly, according to a recent post on Twitter, the cancer has returned. John said that he will begin chemotherapy immediately.

Today was not what we hoped would happen but I started back on the #chemocoaster w/o a definite end. Unfortunately, the cancer has returned again. We continue to research options that may be more beneficial. All of the love & support means a lot. #CheckIt4Andretti #silentkiller

— John Andretti (@John_Andretti) March 30, 2019