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Every dataset is measured with the same single section field per tier, so the counts are comparable; the per-tier value is the largest across the dataset's own accessions, excluding any accession shared with other datasets in the corpus. This accession is a single indexed term, so Europe PMC matches it exactly and the hit count needs no correction."},{"method":"derived","source_url":"https://www.ebi.ac.uk/europepmc/webservices/rest/search","source_label":"Europe PMC first-reference dating","retrieved_at":"2026-09-20T18:13:04.279326Z","snippet":null,"locator":"first referenced in 2025 (DATA_AVAILABILITY section)","confidence":"medium","reviewer":null,"reviewed_at":null,"note":"Availability dated from the literature (epmc-first-reference-v2) rather than from repository file timestamps, which record re-harmonization. This is a lower bound on availability."},{"method":"derived","source_url":null,"source_label":"Marker-paper inference withdrawn","retrieved_at":"2026-09-20T18:18:47.942711Z","snippet":null,"locator":"PMID 40087745 was nominated for 2 datasets","confidence":"high","reviewer":null,"reviewed_at":null,"note":"A marker paper describes one cohort. This article was inferred as the marker paper for several datasets at once, which means the inference is wrong for all but one of them and we cannot tell which, so no marker paper is claimed for this record."}]},"underexplored":{"is_underexplored":false,"basis":["Reuse is within the expected range for comparable datasets (index -0.39)."],"index_value":-0.39,"percentile":39.8,"comparator_set":"132 datasets in this corpus with a citable accession and sufficient metadata","evidence":[{"method":"derived","source_url":null,"source_label":"Reuse Gap Index (rgi-huber-v2)","retrieved_at":"2026-09-21T02:11:22.976067Z","snippet":null,"locator":"Huber robust regression of log2(analyzing articles + 1) on cohort size, years available, modality breadth and access tier","confidence":"medium","reviewer":null,"reviewed_at":null,"note":"Model, covariates and coefficients are published with the dataset export so the label can be recomputed or contested."}]},"grants":[],"access_steps":[{"order":1,"action":"Open the study in the PDC portal","detail":"Proteomic data are released open; the portal's use guidelines still apply.","url":"https://pdc.cancer.gov/pdc/study/PDC000342","requires":[],"est_time":"5 minutes","cli_snippet":null,"audience":"human","evidence":[{"method":"derived","source_url":"https://pdc.cancer.gov/pdc/study/PDC000342","source_label":"PDC access documentation","retrieved_at":"2026-09-21T12:30:59.432682Z","snippet":null,"locator":null,"confidence":"medium","reviewer":null,"reviewed_at":null,"note":"Generated by applying the repository's documented access policy to this dataset's identifiers. It is not a reviewer's account of this dataset."}]},{"order":2,"action":"Accept the data use guidelines and download","detail":"The portal asks for acknowledgement and citation, not a data access request.","url":"https://pdc.cancer.gov/pdc/data-use-guidelines","requires":[],"est_time":"minutes to hours, by study size","cli_snippet":null,"audience":"human","evidence":[{"method":"derived","source_url":"https://pdc.cancer.gov/pdc/data-use-guidelines","source_label":"PDC access documentation","retrieved_at":"2026-09-21T12:30:59.432684Z","snippet":null,"locator":null,"confidence":"medium","reviewer":null,"reviewed_at":null,"note":"Generated by applying the repository's documented access policy to this dataset's identifiers. It is not a reviewer's account of this dataset."}]},{"order":3,"action":"Resolve the study UUID, then fetch the file manifest","detail":"filesPerStudy keys on the study UUID, not on PDC000342: called with the pdc_study_id it returns the right number of rows with every column null. Resolve the UUID first and pass the terms acknowledgement.","url":"https://pdc.cancer.gov/data-dictionary/publicapi-documentation/","requires":[],"est_time":null,"cli_snippet":"python - <<'PY'\nimport requests\nAPI = \"https://proteomic.datacommons.cancer.gov/graphql\"\n\ndef gql(query, **variables):\n    r = requests.post(API, json={\"query\": query, \"variables\": variables}, timeout=180)\n    r.raise_for_status()\n    body = r.json()\n    if body.get(\"errors\"):\n        raise RuntimeError(body[\"errors\"][0][\"message\"])\n    return body[\"data\"]\n\nstudy = gql('query($id:String!){ study(pdc_study_id:$id acceptDUA:true){ study_id } }',\n            id=\"PDC000342\")[\"study\"][0]\nfiles = gql('query($sid:String!){ filesPerStudy(study_id:$sid acceptDUA:true)'\n            '{ file_id file_name file_size } }', sid=study[\"study_id\"])[\"filesPerStudy\"]\nprint(len(files), \"files\")\nPY","audience":"agent","evidence":[{"method":"derived","source_url":"https://pdc.cancer.gov/data-dictionary/publicapi-documentation/","source_label":"PDC access documentation","retrieved_at":"2026-09-21T12:30:59.432686Z","snippet":null,"locator":null,"confidence":"medium","reviewer":null,"reviewed_at":null,"note":"Generated by applying the repository's documented access policy to this dataset's identifiers. It is not a reviewer's account of this dataset."}]}],"analysis_examples":[],"agent_package":{"json_url":"/data/datasets/pdc-ku-cca-discovery-study-global-proteome.json","jsonld_url":"/data/jsonld/pdc-ku-cca-discovery-study-global-proteome.jsonld","croissant_url":"/data/croissant/pdc-ku-cca-discovery-study-global-proteome.json","instructions_url":"/data/agent/pdc-ku-cca-discovery-study-global-proteome.md","bundle_url":null,"mcp_resource_uri":null},"related_dataset_ids":[],"related_underexplored_ids":[],"review":{"status":"machine_only","reviewer":null,"reviewer_affiliation":null,"reviewed_at":null,"sections_reviewed":[],"open_questions":[],"notes":null},"verification":{"last_verified_at":null,"link_checks":[],"n_links_ok":0,"n_links_broken":0,"upstream_version_seen":null,"upstream_version_changed":false,"upstream_counts_seen":{},"upstream_drift":{},"notes":[]},"is_showcase":false,"completeness_score":17.9,"tags":["pdc","proteogenomics"],"search_text":null}