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John Andretti finishes chemotherapy treatments for colon cancer

Toyota/Save Mart 350 Qualifying

SONOMA, CA - JUNE 19: John Andretti, driver of the #34 Taco Bell Chevrolet, sits in his car during qualifying for the NASCAR Sprint Cup Series Toyota/Save Mart 350 at the Infineon Raceway on June 19, 2009 in Sonoma, California. (Photo by Christian Petersen/Getty Images for NASCAR)

Getty Images for NASCAR

Six months after announcing he had been diagnosed with Stage 4 colon cancer, John Andretti revealed Monday he was done with chemotherapy treatments “for now.”

The former NASCAR and IndyCar driver revealed on Twitter he had completed a series of 12 treatments that began in March.

Andretti’s initial surgery after his diagnosis removed 12-14 inches of his colon and scans showed the cancer had spread to his liver and possibly his spleen. In June, he announced that his spleen and gallbladder were cancer free.

After his diagnosis was announced, Andretti, 54, began advocating for men over the age of 50 to get colonoscopies. The campaign spawned the #CheckIt4Andretti hashtag on social media. Andretti shared his treatment experience regularly on Twitter.

The former driver for Richard Petty and Cale Yarborough was the first driver to attempt the “Double” of racing in the Indianapolis 500 and Coca-Cola 600 on the same day.

All cars in this season’s Indy 500 and Coke 600 had #CheckIt4Andretti decals.