Belgian health care for cancer patients

Hi,

My husband was diagnosed with non hodgkins lymphoma 3 years ago .He has been cancer free but if he should need treatment in the future, would the public health care system cover any treatments such as chemo or at least some of the cost? Getting private coverage would be out of the question with the prices they quoted for the one that did accept pre existing conditions. If we payed anything out of pocket would it be reimbursed? His treatments were quite expensive first time around.

Thanks in advance.