How to control cancer 4th stage?

Depends: Depends on the cancer, however, most cancers are treated with chemotherapy. If it is stage 4 breast cancer or stage 4 prostate and disease limited to bone, then hormone therapy is the treatment. Hope this helps.

Can't answer this.: Not enough information to give possibe treatment or perhaps no treatment. Hospice consult?

Depends: Depends greatly on the type of cancer and general health of the patient. Stage IV lymphomas or testicular cancers could be potentially cured or at least treated with success while others are unlikely to do well and are best managed with supportive therapy.