CD22 CD22 molecule
ENSG00000012124 · protein coding · Open Targets profile
Most highly expressed siglec (sialic acid-binding immunoglobulin-like lectin) on B-cells that plays a role in various aspects of B-cell biology including differentiation, antigen presentation, and trafficking to bone marrow (PubMed:34330755, PubMed:8627166). Binds to alpha 2,6-linked sialic acid residues of surface molecules such as CD22 itself, CD45 and IgM in a cis configuration. Can also bind to ligands on other cells as an adhesion molecule in a trans configuration (PubMed:20172905). Acts as an inhibitory coreceptor on the surface of B-cells and inhibits B-cell receptor induced signaling, characterized by inhibition of the calcium mobilization and cellular activation. Mechanistically, the immunoreceptor tyrosine-based inhibitory motif domain is phosphorylated by the Src kinase LYN, which in turn leads to the recruitment of the protein tyrosine phosphatase 1/PTPN6, leading to the negative regulation of BCR signaling (PubMed:8627166). If this negative signaling from is of sufficient strength, apoptosis of the B-cell can be induced (PubMed:20516366). {ECO:0000269|PubMed:20172905, ECO:0000269|PubMed:20516366, ECO:0000269|PubMed:34330755, ECO:0000269|PubMed:8627166}.
Each band is a group of drugs. It runs from the kind of drug on the left to the furthest stage that drug has reached in any disease on the right. Thicker bands mean more drugs.
Approved bands are highlighted. Withdrawn means the drug was pulled from the market or from development. A combined phase counts as the later one (Phase 1/2 is shown as Phase 2). Hover a band for the drug names. Source: Open Targets Platform, fetched live.
Each row is a cancer, strongest overall evidence first. The two dots show how strong the inherited (germline) and tumour-mutation (somatic) evidence is; the line between them is the gap.
Scores run from 0 (no evidence) to 1 (strongest). A missing dot at 0 means Open Targets holds no evidence of that kind. Source: Open Targets Platform, fetched live.
Tractability
- Small molecule
- High-Quality Ligand
- Antibody
- Approved Drug, UniProt loc high conf, GO CC high conf, UniProt SigP or TMHMM
- PROTAC
- Database Ubiquitination, Half-life Data, Small Molecule Binder
- Other modalities
- Approved Drug
gnomAD loss of function constraint: o/e 0.5386599898338318 (upper bound 0.6802099943161011). Low values mean loss of function is poorly tolerated, a safety flag for inhibition.
Who runs trials of these drugs
Principal investigators and study chairs on 52 registry trials, updated in the last three years, of the most advanced drugs against CD22 (inotuzumab ozogamicin, epratuzumab, bectumomab, inotuzumab, yttrium y 90 epratuzumab tetraxetan, BL22, pinatuzumab vedotin), ranked by Phase 2+ trials. Live from ClinicalTrials.gov.
- Elias JabbourM.D. Anderson Cancer Center · 6 of 6 trials Phase 2+Ph2NCT03441061 · Inotuzumab Ozogamicin in Treating Patients With B-cell Acute Lymphocytic Leukemia With Positive Minimal Residual DiseasebriefPh1/Ph2NCT06287229 · Phase Ib/II Study Assessing the Clinical Activity and Safety of Brexucabtagene Autoleucel as a Consolidation in Patients With Relapsed/Refractory (R/R) and Newly Diagnosed B-cell Acute Lymphocytic Leukemia (ALL) Post Cytoreduction With Mini-HCVD-inotuzumab-blinatumomab/HCVAD-inotuzumab-blinatumomabbrief
- Arend von StackelbergCharité - Universitätsmedizin · 2 of 2 trials Phase 2+
- Patrice CHEVALLIERNantes University Hospital · 2 of 2 trials Phase 2+
- Andrew McMillanNottingham University Hospitals NHS Trust · 1 of 1 trials Phase 2+
- Arancha BermúdezHospital Marqués de Valdecilla · 1 of 1 trials Phase 2+
- David McCallM.D. Anderson Cancer Center · 1 of 1 trials Phase 2+
- Fabio CiceriIstituto S. Raffaele, Milan, Italy Giuseppe Saglio, Institute of Hematology, Ospedale Mauriziano, Turin, Italy · 1 of 1 trials Phase 2+
- Giovanni MartinelliIstituto Scientifico Romagnoli per lo Studio e la Cura dei Tumori- IRST Italy · 1 of 1 trials Phase 2+
- Hagop KantarjianM.D. Anderson Cancer Center · 1 of 1 trials Phase 2+
- Issa F KhouriM.D. Anderson Cancer Center · 1 of 1 trials Phase 2+
- Issa KhouriM.D. Anderson Cancer Center · 1 of 1 trials Phase 2+
- Jae ParkMemorial Sloan Kettering Cancer Center · 1 of 1 trials Phase 2+
- Jennifer L McNeerChildren's Oncology Group · 1 of 1 trials Phase 2+
- Jianxiang WangInstitute of Hematology & Blood Diseases Hospital, China · 1 of 1 trials Phase 2+
- Marlise R. LuskinDana-Farber Cancer Institute · 1 of 1 trials Phase 2+
Registry trials of inotuzumab ozogamicin, epratuzumab, bectumomab, inotuzumab, yttrium y 90 epratuzumab tetraxetan, BL22, pinatuzumab vedotin updated in the last three years, counted by the country group of their listed sites. A trial with sites in several groups counts in each; 36 of 47 have all sites in one country.
Site counts are not patients per country, and trials registered only outside ClinicalTrials.gov are not covered. Where sites are is a fact about the record, not a judgement of its quality. Europe is the EU and EEA, the UK and Switzerland. 5 trials list no sites and are left out. Source: ClinicalTrials.gov, fetched live.
25 trials of drugs against CD22 were stopped early; 7 give no reason
Terminated, withdrawn and suspended interventional trials of inotuzumab ozogamicin, epratuzumab, bectumomab, inotuzumab, yttrium y 90 epratuzumab tetraxetan, BL22, pinatuzumab vedotin, yttrium y 90 epratuzumab, epratuzumab-cys-tesirine, mono-dga-rfb4, newest update first, live from ClinicalTrials.gov. Each reason is quoted exactly as the registry gives it; we do not sort reasons into safety, efficacy or business. Dates are the last registry update. Showing the 25 most recent of 25.
- terminated · 2026-07-30 · M.D. Anderson Cancer Center · Inotuzumab Ozogamicin“the study was closed early due to competing trials”
- withdrawn · 2026-06-24 · Nantes University Hospital · 90Y-DOTA-Epratuzumab IgG/Epratuzumab IgGNo reason given
- suspended · 2026-05-29 · The First Affiliated Hospital of Soochow University · matched by the registry's drug synonyms“According to the new regulations of China, newly launched clinical trials involved CAR-T cells must be apporved first by China National Center for Biotechology Development.”
- terminated · 2026-04-15 · M.D. Anderson Cancer Center · Inotuzumab Ozogamicin“<75% participation”
- terminated · 2026-02-12 · St. Jude Children's Research Hospital · Inotuzumab ozogamicin“Closed due to slow accrual”
- terminated · 2025-12-12 · M.D. Anderson Cancer Center · matched by the registry's drug synonyms“<75% participation”
- terminated · 2025-09-05 · M.D. Anderson Cancer Center · matched by the registry's drug synonyms“PI Request. Slow accrual and lack of clinical interest”
- withdrawn · 2022-01-28 · Roswell Park Cancer Institute · Inotuzumab Ozogamicin“no accrual”
- terminated · 2021-08-19 · Gilead Sciences · Epratuzumab (hLL2- anti-CD22 humanized antibody)“low accrual”
- withdrawn · 2021-08-18 · Gilead Sciences · Veltuzumab and 90Y-Epratuzumab Tetraxetan, 90Y-epratuzumab tetraxetan“No subjects enrolled”
- terminated · 2021-08-16 · Gilead Sciences · hLL2 (epratuzumab)“lack of accrual”
- terminated · 2021-04-12 · M.D. Anderson Cancer Center · Inotuzumab Ozogamicin“the study was closed early due to competing trials”
- withdrawn · 2020-07-09 · Novartis Pharmaceuticals · Inotuzumab“Novartis is no longer pursuing this study because of planned investigation of novel CAR-T therapies in this patient population.”
- terminated · 2019-01-08 · Pfizer · Inotuzumab ozogamicin“The study was terminated prematurely on May 16, 2013, for futility. No new or unexpected safety issues were identified.”
- terminated · 2018-02-22 · Weill Medical College of Cornell University · 90Y-epratuzumab tetraxetan“closed to enrollment due to slow patient accrual”
- terminated · 2018-01-09 · Pfizer · inotuzumab ozogamicin“See termination reason in detailed description.”
- withdrawn · 2017-01-19 · Nantes University Hospital · 90Y-epratuzumab tetraxetanNo reason given
- terminated · 2015-10-29 · National Cancer Institute (NCI) · BL22 (CAT-3888)“The supply of BL22 has expired and MedImmune the sponsor is not interested in producing any new supply.”
- withdrawn · 2015-04-28 · National Cancer Institute (NCI) · BL22 immunotoxinNo reason given
- terminated · 2014-05-22 · M.D. Anderson Cancer Center · Epratuzumab“Slow accrual”
- withdrawn · 2014-05-21 · UCB Pharma · EpratuzumabNo reason given
- terminated · 2012-06-07 · UCB Pharma · EpratuzumabNo reason given
- terminated · 2012-04-03 · UCB Pharma · epratuzumabNo reason given
- terminated · 2011-11-08 · UCB Pharma · epratuzumabNo reason given
- suspended · 2007-12-28 · MedImmune LLC · BL22 immunotoxin“protocol development and Amended protocol revision”
Paediatric incentives and obligations for CD22's drugs
For inotuzumab ozogamicin, epratuzumab, bectumomab, inotuzumab, yttrium y 90 epratuzumab tetraxetan, BL22, pinatuzumab vedotin, yttrium y 90 epratuzumab, epratuzumab-cys-tesirine, mono-dga-rfb4: what EMA and FDA publish about paediatric plans, orphan status and pediatric approvals, and how many registered studies take children. Each line is a yes, no or not published fact from the record linked under it; none of it is a forecast.
- FDA pediatric target list: yes · CD22 is on the list. Membership alone neither requires nor waives a pediatric study.Rule: Target is on FDA's Pediatric Molecular Target List (relevant targets). Source: FDA Pediatric Molecular Target List (Listed as February 2026 on the FDA Pediatric Oncology page; the file served is 9.7.22_the_relevant_molecular_target_list.xlsx, whose Summary of Changes sheet is headed 'SEPTEMBER 2022 UPDATE' (footnote date 2022-09-01)), 2026-11-11
- EU paediatric investigation plan: yes · EMEA-001429-PIP01-13-M07 (Inotuzumab ozogamicin, Treatment of B cell acute lymphoblastic leukaemia): PM: decision on the application for modification of an agreed PIP, 10 Mar 2023; EMEA-001295-PIP01-12-M01 (Epratuzumab, Treatment of Systemic Lupus Erythematosus (SLE)): PM: decision on the application for modification of an agreed PIP, 5 Jun 2015Rule: An EMA PIP decision (agreement, modification or waiver) lists the drug as its active substance, exact name. Source: EMA data download (dated snapshot), 2026-11-11
- EU orphan designation: yes · EU/3/13/1127 positive 7 Jun 2013: Treatment of B-cell acute lymphoblastic leukaemiaRule: An EU orphan designation lists the drug as its active substance (exact name) or belongs to a medicine that does; withdrawn and expired designations are listed with their status. Source: EMA EU/3/13/1127, 2026-11-11
- Authorised in the EU: yes · Besponsa: authorised since 28 Jun 2017, orphan medicineRule: An EMA medicine record lists the drug as its active substance or INN, exact name; national-only authorisations are not in this file. Source: EMA EPAR Besponsa, 2026-11-11
- FDA orphan designation: not published · FDA's orphan designation database turns away automated requests, so this app does not read it; search it by hand at the linkRule: Would be: an FDA orphan designation names the drug. Source: FDA orphan designations search
- FDA pediatric oncology approval: yes · Inotuzumab ozogamicin [Besponsa], 6 Mar 2024: Treatment of relapsed or refractory CD22-positive B-cell precursor acute lymphoblastic leukemia (ALL) in adult and pediatric patients 1 year and olderRule: FDA's Pediatric Oncology Drug Approvals table names the drug. Source: FDA Pediatric Oncology Drug Approvals (content current as of 2026-03-03), 2026-11-11
- Registered studies open to children: yes · 33 interventional studies of inotuzumab ozogamicin, epratuzumab, bectumomab, inotuzumab, yttrium y 90 epratuzumab tetraxetan, bl22, pinatuzumab vedotin, yttrium y 90 epratuzumab, epratuzumab-cys-tesirine, mono-dga-rfb4 include patients under 18; 17 are recruiting, not yet recruiting or activeRule: The registry's age group includes Child (birth to 17 years), which also counts studies that set no minimum age. Source: ClinicalTrials.gov search, 2026-11-11
Rare pediatric disease voucher. FDA, content current as of 29 Apr 2026: “As of February 3, 2026, enactment of the Consolidated Appropriations Act, 2026, the rare pediatric disease PRV program will sunset after September 30, 2029. FDA may not award any PRVs under this program after September 30, 2029.” Voucher sale prices are not shown here; they appear only as company-reported news. FDA: Rare Pediatric Disease Designation and Priority Review Voucher Programs
All 11 drugs and clinical candidates as a table
Each drug, stage and indication links to its Open Targets record, where the trials and approvals behind it are listed. Salt forms (for example a mesylate) are listed as Open Targets records them, as separate entries.