Former Dragons' Den personality W. Brett Wilson said on Twitter that his cancer has returned, but he vowed to beat it again.

Wilson, 57, tweeted that with two months of radiation and other treatments, he will be "#KickingCancersAss." 

The Calgary-based entrepreneur, who co-founded FirstEnergy Capital in 1993, a Canadian brokerage firm, said he was grateful to have beaten cancer 13 years ago and also grateful for the opportunity to beat it again.

Wilson was diagnosed with prostate cancer in 2001.