May 20, 2009 Warrant issued for Hauser's mother Play video

(NECN/ABC) - He refused chemotherapy to treat his cancer, now Daniel Hauser, 13, has disappeared along with his mother, Colleen.

"I could only guess and surmise, but maybe they just broke down, and out of fear they just left," family friend Dan Zwakman said.

The two have not been seen since Monday, after a court-mandated X-ray revealed the teen's tumor had grown. Daniel's father was open to some sort of treatment -- his mother was not.

"Once Daniel has been found and brought before the court, the court is either going to have them immediately determine an oncologist, or the court's going to make that decision for them," Brown County Attorney James Olson said.

After his diagnosis, Daniel received an initial round of chemotherapy to fight his Hodgkins lymphoma.

Doctors say with chemo the teen has a 90 percent chance of beating the cancer. Without, less than 50.

With his parents' consent, Daniel chose to quit chemo, citing religious beliefs, his mother said at the time. They would resort to natural remedies instead.

"Give us some time to heal our son and if it does not work the door is still open on both ends," Colleen Hauser said at the time.

Monday, a judge ruled against the family, citing medical neglect, ordering the teen be taken to a doctor.

"There are ways of dealing with a dispute with a judge's decision, and that resolution is not to flee," Daniel's attorney Phillip Albert said.

"So I'm asking that, just as we were advocating respecting the parents, that Ms. Houser respects the court and the court's order."

The judge has issued a warrant for Colleen Hauser's arrest and ruled her in contempt of court. He also ordered Daniel be immediately placed in foster care.

ABC's Diana Alvear reports.