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James Van Der Beek 's serious health issues -- notably, cancer -- have caused him to drop out of Monday's much-anticipated "Dawson's Creek" reunion.

Van Der Beek -- who starred as Dawson Leery on the hit TV show -- took to Instagram Sunday and told fans he's "gutted" about missing today's big reunion, which was put together Michelle Williams . As you know, James was diagnosed with stage 3 colorectal cancer in November 2024.

In his IG post ... Van Der Beek wrote he's currently "out of commission" because he's battling two stomach viruses that have kept him "grounded at the worst possible moment.” He also said he was really looking forward to the charity event ever since Williams conceived the idea in January.

The 2 actors were slated to attend the reunion at Ri

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