Depends on the type of leukaemia and yes the stage. It generally it’s incurable.
https://www.healthline.com/health/leukemia/is-leukemia-curable#:~:text=As%20with%20other%20types%20of,longer%20detected%20in%20the%20body.
Key word... curable
It is treatable...
If diagnosed and treated at an early stage, many of the symptoms can be addressed before it can progress and lessen chances of remision. One way (at least pharmacologically speaking) is chemo. By addressing the cancer cells at an early stage, many of the life threatening aspects of Leukemia can be addressed, after that is symptomatic treatment and regular use of medication and supplementation as well as regular monitoring and maintenance.
Remember everyone, do your regular check ups. And if your family has history of any cancer, it is best to get checked up early so you can get screened and diagnosed early (●'◡'●)ノ
But leukemia is an incurable disease here too.