Feasibility and Effectiveness of Inotuzumab Ozogamicin in B-Cell Acute Lymphoblastic Leukemia

Inclusion Criteria: * Ph+ ALL with p190 or p210 detectable and measurable (at least 10-4 x10000 ABL) after at least 3 months of any therapy, or the failure of at least 2 TKI. * Ph- ALL with detectable and measurable IG specific transcript after at least 2 courses of previous therapy. * Age ≥ 18 years old. * ECOG ≤ 2. Exclusion Criteria: * More than 5% of BM blasts. * WHO performance status ≤ 50% (Karnofsky) or ≥ 3 (ECOG). * Active HBV or HCV hepatitis, or AST/ALT ≥ 2.5 x ULN and bilirubine ≥ 1.5 x ULN. * Evidence of liver fibrosis, portal hypertension or other clinically relevant liver abnormalities at screening liver ultrasonography. * History of alcohol abuse. * Burkitt lymphoma and active CNS leukemia. Patients with previuos neurological toxicitiy as well co-morbidity will be carefully evaluated for enrolment. * Ongoing or active infections. * Uncontrolled hypertriglyceridemia (triglycerides \>450 mg/dL). Clinically significant, uncontrolled, or active cardiovascular disease. * Uncontrolled hypertension (diastolic blood pressure \>90 mm Hg; systolic \>140 mm Hg). Patients with hypertension should be under treatment on study entry to effect blood pressure control. * Creatinine level \> 2.5mg/dl or Glomerular Filtration Rate (GFR) \< 20 ml/min or proteinuria \> 3.5 g/day. * Documented inherited protrombotic disorders * Patients who have received any investigational drug ≤ 4 weeks. * Patients who have undergone major surgery ≤ 2 weeks prior to starting study drug or who have not recovered from side effects of such therapy. * Patients with a history of another primary malignancy that is currently clinically significant or currently requires active intervention or with a life expectancy due to other malignancy \<6 months. * Patients that have received Inotuzumab or Anti CD22 directed therapies before * Patients with known hereditary coagulopathy * Patient that received during their life diagnosis of VOD or had ongoing VOD * Patients who are pregnant or breastfeeding and adults of reproductive potential not employing an effective method of birth control (women of childbearing potential must have a negative serum pregnancy test within 48 hrs prior to administration of induction therapy). Postmenopausal women must be amenorrheic for at least 12 months to be considered of non-childbearing potential. Male and female patients must agree to employ an effective barrier method of birth control throughout the study and for up to 4 months following discontinuation of study drugs. * Patients unwilling or unable to comply with the protocol.