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acute lymphoblastic leukaemia, ALL, blood cancer, leukemia, white blood cells, bone marrow, cancer treatment, chemotherapy, pediatric leukemia, adult leukemia, blood disorder, malignant cells, immune system, hematology, leukaemia symptoms, fatigue, fever, easy bruising, bleeding, anemia, infection risk, cancer diagnosis, blood test, bone marrow biopsy, leukaemia cells, disease progression, cancer research, hematologic malignancy, oncology, cancer therapy, remission, relapse, lymphoblasts, abnormal blood cells, cancer care, blood cancer symptoms, hematopoietic system, lymphoid cells, cancer support, leukaemia management, leukaemia treatment