Acute Lymphoblastic Leukemia, Causes, Signs and Symptoms, Diagnosis and Treatment.

Acute Lymphoblastic Leukemia (ALL) is a cancer of the blood and bone marrow, originating from white blood cells (lymphocytes or lymphoblasts). It can affect B-cells or T-cells and is aggressive, progressing rapidly if untreated. ALL is the most common childhood cancer, offering a good chance of cure in children, though cure rates decrease in adults. In 2015, it affected 876,000 people globally, leading to 111,000 deaths.

The exact cause of ALL is unknown, but it's believed to stem from genetic mutations in bone marrow cells causing abnormal and rapid cell multiplication. Risk factors include certain genetic disorders like Down syndrome, Li-Fraumeni syndrome, and neurofibromatosis. Exposure to chemicals (benzene, chemotherapy drugs, paint strippers), being male, high radiation exposure, infections like HTLV-1 and Epstein-Barr virus, and a family history (especially a sibling or twin) are also significant risk factors.

Symptoms of ALL include bone and joint pain, fever, shortness of breath, night sweats, fatigue, bleeding gums, pale skin, easy bruising or bleeding, enlarged lymph nodes, frequent infections, testicular enlargement, weight or appetite loss, dizziness, enlarged liver or spleen, and cranial nerve palsies.

Diagnosis involves blood tests to count normal blood cells and identify immature cells, bone marrow aspiration to test for leukemia cells and determine their origin (B or T lymphocytes), and imaging tests (X-ray, CT scan, ultrasound) to check for metastasis. A spinal fluid test is also conducted to see if cancer cells have spread to the spinal fluid surrounding the brain and spinal cord.

Treatment for ALL typically includes several phases: induction therapy to kill leukemia cells and restore blood counts, post-remission therapy to eliminate remaining undetected leukemia cells, and maintenance therapy to prevent recurrence. Common treatments involve chemotherapy, targeted therapy, radiation therapy, and bone marrow or stem cell transplants. Clinical trials for new treatments are also an option.