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That being said, forcing treatment on a child who doesn't want it is its own kind of ethical dilemma. "There are some kids for whom it becomes in their mind a vicious assault every time they're treated," says Diekema. "At a certain age and height and weight, it starts to seem inappropriate to hold them down on a regular basis to do what needs to be done." Daniel Hauser has reportedly vowed to punch, kick or scratch anyone who attempts to treat him. Even if medical support staff members are successful at physically restraining Hauser so that they can administer the chemotherapy, the psychological toll may impede his progress. With longer-term treatments—fighting cancer can take years—it's harder to successfully apply aggressive therapies if the patient is unwilling, especially because a certain mental toughness is required.

At 13, Daniel is far from the age where he could be making his own medical decisions, though judges are likely to weigh the value of a child's input on a case-by-case basis, rather than using an arbitrary age cutoff. It's remarkable how quickly terminal cancer can mature a 12-year-old. (Legal adulthood is 18, and certain decision-making authority can be granted at 16, but the line is blurry when it comes to children's medical care.)