CPAMD8 as a Radioligand Therapy Target
CPAMD8, C3 and PZP like alpha-2-macroglobulin domain containing 8, is a cell-surface protein. In Human Protein Atlas immunohistochemistry, CPAMD8 staining is highest in thyroid cancer (100% of samples positive), ovarian cancer (100% of samples positive) and melanoma (100% of samples positive). Clinical status: Discovery-stage (no clinical drug program).
Is CPAMD8 a good radioligand therapy target?
Scored against the six criteria that decide whether a protein can become a radioligand therapy:
- ✅ Cell-surface accessibility: Localized to the cell surface, so a radioligand can reach it from circulation.
- ✅ Tumor expression: High IHC staining in thyroid cancer, 100% of samples positive.
- ❔ Internalization: Not yet assessed.
- ⚠️ Clinical precedent: Discovery-stage (no clinical drug program)
- ❔ Shedding: Not yet assessed.
- ❔ Normal-tissue dosimetry: Check kidney, liver, bone marrow and salivary expression in the Human Protein Atlas tissue atlas.
CPAMD8 expression in cancer
Protein expression of CPAMD8 across 20 cancer types from Human Protein Atlas immunohistochemistry. The score is a weighted staining intensity from 0 to 1; "% positive" is the share of patient samples with detectable staining.
| Cancer type | IHC score | Level | % positive |
|---|---|---|---|
| Thyroid Cancer | 1.00 | High | 100% |
| Ovarian Cancer | 0.81 | High | 100% |
| Melanoma | 0.78 | High | 100% |
| Liver Cancer | 0.78 | High | 100% |
| Breast Cancer | 0.76 | High | 100% |
| Prostate Cancer | 0.76 | High | 100% |
| Pancreatic Cancer | 0.75 | High | 100% |
| Skin Cancer | 0.73 | High | 100% |
| Cervical Cancer | 0.72 | High | 100% |
| Endometrial Cancer | 0.72 | High | 100% |
| Lung Cancer | 0.71 | High | 100% |
| Colorectal Cancer | 0.67 | High | 100% |
| Head and Neck Cancer | 0.67 | High | 100% |
| Kidney Cancer | 0.67 | High | 100% |
| Neuroendocrine Tumors | 0.67 | High | 100% |
| Testicular Cancer | 0.67 | High | 100% |
| Bladder Cancer | 0.64 | High | 91% |
| Lymphoma | 0.57 | High | 90% |
| Glioma | 0.48 | Medium | 82% |
| Gastric Cancer | 0.47 | Medium | 80% |
Is CPAMD8 internalized?
Nuclens has not yet extracted internalization evidence for CPAMD8. Internalization matters for radioligands because an internalizing receptor traps the radionuclide inside the tumor cell. Run a full analysis to pull the latest literature.
CPAMD8 clinical trials
Discovery-stage (no clinical drug program). Nuclens hasn't indexed trials for CPAMD8 yet. Search ClinicalTrials.gov for CPAMD8 trials.
CPAMD8 normal tissue expression
Normal-tissue expression in dose-limiting organs (kidney, liver, bone marrow, salivary glands) drives radioligand dosimetry risk. Nuclens is re-validating its normal-tissue values, so they are not shown here yet. See CPAMD8 in the Human Protein Atlas tissue atlas, and read how normal-tissue expression predicts radioligand dosimetry risk.
CPAMD8 gene essentiality (DepMap)
CRISPR knockout effect across 1256 cancer cell lines: -0.42 (not essential). Radioligands kill by radiation, not by blocking the target, so essentiality matters less than for inhibitors. A non-essential target can still be an excellent radioligand target.
Related thyroid cancer radioligand targets
c-MET (MET) · HER3 (ERBB3) · EPCAM · SSTR2 · EGFR · ITGAV · STEAP2 · FAP
See all radioligand therapy targets in thyroid cancer.
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Run a free analysisData sources
Subcellular localization: UniProt via Open Targets (CC BY 4.0 / CC0). Tumor immunohistochemistry: Human Protein Atlas (CC BY-SA 4.0). Clinical trials: ClinicalTrials.gov (public domain). Gene essentiality: DepMap (CC BY 4.0). Internalization and shedding: AI-extracted from PubMed abstracts, so verify against the cited papers before relying on them. Nuclens is a first-pass triage layer, not a substitute for wet-lab validation or clinical dosimetry. Derived expression data on this page is shared under CC BY-SA 4.0.