In response to the news, his bandmate, Travis Barker, told E! News, "Mark is my brother and I love and support him. I will be with him every step of the way on stage and off and can't wait for us to play together again soon."
Hoppus, 49, announced on Twitter on June 23 that he has cancer.
"For the past three months I've been undergoing chemotherapy for cancer," Hoppus' statement on Twitter read. "I have cancer. It sucks and I'm scared, and at the same time I'm blessed with incredible doctors and family and friends to get me through this."
He continued, "I still have months of treatment ahead of me but I'm trying to remain hopeful and positive. Can't wait to be cancer free and see you all at a concert in the near future. Love to you all."
Carson Daly, who got to know Hoppus during his TRL days, sent the rocker his best.
"I'm thinking & praying for my friend @markhoppus from @blink182 who announced he's fighting cancer," Daly wrote on Instagram. "We may not speak everyday, but I hold in my heart such incredible memories of a time long ago, when we shared a stage & a mic doing what we both loved so much. I've always been such a fan. You're one of the best people I've met in the business & know you will kick the shit out of this & be back rocking in no time. I'm here, we're all here, right with you on this fight. Stay positive & you'll beat this thing with the same ease that you Tom & Trav had when you ran naked around the MTV studios back in the day. Love you bro. You got this."
A couple of weeks before sharing his cancer diagnosis, Hoppus celebrated the 20-year anniversary of Blink-182's fourth album, Take Off Your Pants and Jacket.
"Hell yes. 20 years ago Take Off Your Pants and Jacket came out," he gushed in his caption. "After the overwhelming and unexpected success of Enema of the State we wanted to write a darker, harder album that pushed the boundaries of what blink-182 could do."
He continued, "I love this record. Thank you to everyone who listened to it then continues to put it on two decades later."
Hoppus proceeded to shout-out Barker, Tom Delonge and Jerry Finn, the other members of the band.