James Van Der Beek backed out of a "Dawson's Creek" reunion due to health issues.Van Der Beek, who starred as Dawson Leery in the hit series, was set to read the pilot along with the original cast for a charity event on Sept. 22. However, he revealed he was "gutted" to not attend after after contracting two stomach viruses. The actor's illness comes as he continues to battle cancer."This is the evening Id been looking forward to MOST since my angel Michelle Williams said she was putting it together, way back in January," he wrote on Instagram."So you can imagine how gutted I was when two stomach viruses conspired to knock me out of commission and keep me grounded at the worst possible moment," he explained. "Despite every effort I wont get to be there. I wont get to stand on that stage and thank every soul in the theater for showing up for me, and against cancer, when I needed it most."JAMES VAN DER BEEK MISTOOK CANCER SYMPTOMS FOR PROBLEMS WITH HIS DIETVan Der Beek revealed he would be replaced by Lin-Manuel Miranda for the reunion.He called Miranda "a ridiculously overqualified replacement who would have been #1 on my wishlist (had I ever dreamed hed be available).""Someone my kids would definitely consider an upgrade over me Plus, he already knows how to get to the theater. So thats convenient. The role of Dawson, usually played by James Van Der Beek Will be played by Lin-Manuel Miranda.""Cant believe I just got to type that."LIKE WHAT YOURE READING? CLICK HERE FOR MORE ENTERTAINMENT NEWSVan Der Beek was diagnosed with stage 3 colorectal cancer in August 2023. The actor didn't publicly reveal his cancer battle until roughly a year later. He recently opened up about his diagnosis in an interview with Healthline, saying "there wasnt any red flag or something glaring" when it came to his symptoms."I was healthy. I was doing the cold plunge," Van Der Beek told the outlet. "I was in amazing cardiovascular shape, and I had stage 3 cancer, and I had no idea."The "Varsity Blues" star, now 48, said he didnt realize he was past the age to begin screenings."Before my diagnosis, I didnt know much about colorectal cancer," he explained. "I didnt even realize the screening age [had] dropped to 45; I thought it was still 50."CLICK HERE TO SIGN UP FOR THE ENTERTAINMENT NEWSLETTERAfter competing as Griffin on "The Masked Singer," Van Der Beek explained he's now in a "healing phase.""I feel like I can see the finish line I'm in a healing phase, which is great," he told Extra in March.