CEDAR RAPIDS, Iowa (CNN) - Speaking to reporters at a press conference Monday, cancer survivor and seven-time Tour de France winner Lance Armstrong said that, while his Livestrong Presidential Cancer Forum was beneficial for getting candidates on the record regarding the issue, he wished more of them would have shown up.
"We obviously think a disease that kills 600,000 Americans a year deserves having all of the frontrunners here," said Armstrong.
He went on to mention a few of those frontrunners by name.
"It's a disappointment," Armstrong continued, "that two cancer survivors on the Republican side are not coming. Mayor Giuliani [and] Senator McCain [are] both cancer survivors. As a fellow survivor and as somebody that wants to represent this community and wants to see change happen, that's disappointing."
Of the four top Democratic candidates, three of them - Sen. Hillary Clinton, Sen. John Edwards and Gov. Bill Richardson - spoke to the crowd of over 2,000. One was notably absent.
Sen. Barack Obama's Iowa communications director Josh Earnest told CNN that Obama has no public events today and is "spending some private time with his family."
Earnest also said they plan to issue a statement relevant to "issues relating to cancer."
Armstrong said he understands people have other commitments, but that didn't stop him from making one final plea.
"[It's] fine that you couldn't make it tomorrow, fine that Senator Obama couldn't make it today, but please think about this the next time we call and ask for your input," urged the famous cyclist.
Ohio congressman Dennis Kucinich was the only other Democrat on stage.
As of this writing, the only two GOP presidential candidates slated to speak Tuesday during the Republican forum are Kansas Sen. Sam Brownback and former Arkansas governor Mike Huckabee.
-CNN Iowa Producer Chris Welch