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Exogenous contrast agents with PA properties in clinical trials.
| Drug | Type of Cancer | Clinicaltrials.gov ID | Current Clinical Trials | References |
| Cetuximab-IRDye800 | Pancreatic cancer | NCT02736578 | Phase 2 | [178] |
| Indocyanine green | Colon cancer | NCT01662752 | Phase 2 | [180] |
| Methylene blue | Colorectal cancer | NCT01694966 | Phase 3 | [181] |
