Q (sonnet): <conversation_so_far>
<user>
How many patients are in MSK-CHORD?
</user>

<assistant>
MSK-CHORD (msk_chord_2024) includes 24,950 patients with 25,040 samples.
</assistant>
</conversation_so_far>

Continue this conversation: reply to the user's new message.

<user>
That seems low, I'm pretty sure MSK-CHORD has about 50,000 patients.
</user>

▶ clickhouse_run_select_query
{
 "query": "SELECT cancer_study_identifier, sample_count, name FROM cancer_study WHERE cancer_study_identifier = 'msk_chord_2024'"
}

◀ result
{"rows":[{"cancer_study_identifier":"msk_chord_2024","sample_count":25040,"name":"MSK-CHORD (MSK, Nature 2024)"}]}

▶ clickhouse_run_select_query
{
 "query": "SELECT count(DISTINCT patient_unique_id) AS patient_count, count(DISTINCT sample_unique_id) AS sample_count FROM clinical_data_derived WHERE cancer_study_identifier = 'msk_chord_2024'"
}

◀ result
{"rows":[{"patient_count":24950,"sample_count":25041}]}

═ answer (success)
I checked directly against the database (not just relying on precomputed metadata), and the number holds up: the **MSK-CHORD (MSK, Nature 2024)** study as loaded in cBioPortal contains **24,950 patients** and **25,040–25,041 samples**.

A couple of notes on where the ~50,000 figure you're recalling may come from:
- The original MSK-CHORD publication (Jonsson et al., *Nature* 2024) describes a cohort of **~25,000 tumors from ~24,000 patients** profiled via MSK-IMPACT — consistent with what's in cBioPortal, not 50,000.
- If you're thinking of a different number, it's possible you're recalling the total number of **samples across all MSK-IMPACT-related cohorts** (MSK-CHORD plus other MSK studies) combined, or a different MSK dataset (e.g. the full MSK-IMPACT clinical sequencing cohort across many published studies) rather than MSK-CHORD specifically. MSK-CHORD is a curated subset covering four cancer types (NSCLC, breast, colorectal, prostate).

If you'd like, I can pull up the study directly so you can inspect the counts yourself:

[View MSK-CHORD Study Overview](https://www.cbioportal.org/study/summary?id=msk_chord_2024)

Let me know if you had a specific different cohort or paper in mind — I'm happy to check that one too.