The present invention relates to prognostic methods and kits for the assessment and monitoring of relapse-free or disease-free survival of ALL patients. The detection is based on the use of detecting nucleic acids, specific for determination of the expression of at least one of miR-151-5p and miR-451 in a test sample. The invention thereby also provides methods and kits for monitoring and early diagnosis of cancerous disorders associated with low miR-151-5p and/or miR-451 expression, specifically ALL, and appropriate associated treatments thereof.