Live from Open Targets Platform, fetched 2026-11-12 06:45 UTC. Every row links to its source record.

CA7 carbonic anhydrase 7

ENSG00000168748 · protein coding · Open Targets profile

Reversible hydration of carbon dioxide. {ECO:0000269|PubMed:15686895, ECO:0000269|PubMed:16686544, ECO:0000269|PubMed:16807956, ECO:0000269|PubMed:17127057, ECO:0000269|PubMed:17314045, ECO:0000269|PubMed:17705204, ECO:0000269|PubMed:19186056, ECO:0000269|PubMed:19206230}.

2 of the 3 drugs recorded against CA7 are approved

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 Withdrawn means the drug was pulled from the market or from development.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.

CA7: inherited and tumour-mutation evidence across 15 cancers

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.

Inherited (germline) variantsMutations in tumours (somatic)

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: Approved Drug, Structure with Ligand, High-Quality Ligand, Druggable Family
PROTAC: Small Molecule Binder

gnomAD loss of function constraint: o/e 0.4145500063896179 (upper bound 0.6590800285339355). 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 6 registry trials, updated in the last three years, of the most advanced drugs against CA7 (methazolamide, sulthiame), ranked by Phase 2+ trials. Live from ClinicalTrials.gov.

Malik Y. Kahook
University of Colorado, Denver · 1 of 1 trials Phase 2+
Ph4NCT05498103 · Use of Methazolamide to Lower Intraocular Pressure brief
Peter LeWitt
Henry Ford Health System · 1 of 1 trials Phase 2+
Ph2NCT06312800 · Acamprosate and Methazolamide for Essential Tremor brief
Vittorio Porciattti
University of Miami · 1 of 1 trials Phase 2+
Ph3NCT02390284 · Stop Retinal Ganglion Cell Dysfunction Study brief

4 of 6 trials of drugs against CA7 have sites only in United States

Registry trials of methazolamide, sulthiame 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; 6 of 6 have all sites in one country.

Sites only in this groupSites here and elsewhere

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. Source: ClinicalTrials.gov, fetched live.

4 trials of drugs against CA7 were stopped early

Terminated, withdrawn and suspended interventional trials of methazolamide, sulthiame, 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 4 most recent of 4.

Ph3NCT02390284 brief why it stopped
terminated · 2025-08-26 · University of Miami · Methazolamide
“No patients had abnormal PERG and could not be included in the first two arms from the baseline timepoint.”
Ph2NCT06312800 brief why it stopped
withdrawn · 2024-09-25 · Henry Ford Health System · Methazolamide
“Study was never initiated.”
Ph2NCT00257829 brief why it stopped
withdrawn · 2018-12-03 · University of California, Irvine · Methazolamide
“This study was closed due to lack of funding.”
Ph3NCT00471744 brief why it stopped
terminated · 2009-01-29 · Ludwig-Maximilians - University of Munich · Treatment with levetiracetam or sulthiame over a six-month period.
“low patient number after 2 years recruiting”

Paediatric incentives and obligations for CA7's drugs

For methazolamide, sulthiame: 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: no · CA7 is not on the list
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: no · No EMA paediatric investigation plan decision names methazolamide, sulthiame
Rule: 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: no · No EU orphan designation names methazolamide, sulthiame
Rule: 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 data download (dated snapshot), 2026-11-11
Authorised in the EU: no · EMA lists no centrally authorised medicine of methazolamide, sulthiame
Rule: 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 data download (dated snapshot), 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 link
Rule: Would be: an FDA orphan designation names the drug. Source: FDA orphan designations search
FDA pediatric oncology approval: no · FDA's table lists no pediatric approval of methazolamide, sulthiame
Rule: FDA's Pediatric Oncology Drug Approvals table names the drug. Source: FDA Pediatric Oncology Drug Approvals (content current as of 2026-03-03), 2026-11-12
Registered studies open to children: yes · 1 interventional studies of methazolamide, sulthiame include patients under 18; 0 are recruiting, not yet recruiting or active
Rule: The registry's age group includes Child (birth to 17 years), which also counts studies that set no minimum age. Source: ClinicalTrials.gov search, 2026-11-12

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 3 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.

Drug	Type	Highest stage	Indications	Source records
METHAZOLAMIDE	Small molecule	phase 4	glaucoma, open-angle glaucoma, type 2 diabetes mellitus, cervical cancer, essential tremor	Open Targets · ChEMBL
SULTHIAME	Small molecule	phase 4	epilepsy, obstructive sleep apnea syndrome, childhood-onset epilepsy syndrome	Open Targets · ChEMBL
ETHOXZOLAMIDE	Small molecule	withdrawal	duodenal ulcer	Open Targets · ChEMBL