# Data extraction template — one form per included SR/MA

Use one copy of this form per study included in the umbrella review.
Fields not extractable from the abstract are marked **NR (full text needed)** and must be completed before manuscript submission.

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## Identification

| Field | Value |
|---|---|
| **Study identifier** | PMID: ____ &nbsp;&nbsp; DOI: ____ |
| **Citation (Vancouver)** | _Author1, Author2, et al. Title. Journal Year;Vol(Issue):pages. doi:_ |
| **First author** | _Surname Given_ |
| **Year of publication** | YYYY |
| **Journal** | _Full name_ |
| **Country (corresponding author affiliation)** | _NR (full text needed)_ |

## Methods

| Field | Value |
|---|---|
| **Review design** | SR / MA / Pooled analysis / Network MA |
| **Databases searched** | PubMed / Embase / Cochrane / Web of Science / other |
| **Search end date** | YYYY-MM-DD |
| **Number of included primary studies** | _n_ |
| **Total participants (pooled across studies)** | _n_ |

## Population, Intervention, Comparator

| Field | Value |
|---|---|
| **Population — clinical N status** | cN+ confirmed / cN0 / mixed |
| **Population — breast cancer subtype distribution** | HR+/HER2- _%_ ; HER2+ _%_ ; TNBC _%_ ; not reported |
| **Intervention(s)** | SLNB / TAD / MARI / ALND / NAC / NET / PMRT / other |
| **Comparator(s)** | _e.g._ ALND, no ALND, observation |

## Outcomes

| Field | Value |
|---|---|
| **Primary outcome reported** | e.g. axillary pCR rate, false-negative rate of SLNB, identification rate, locoregional recurrence, OS/DFS |
| **Pooled estimate (if MA)** | Point estimate (95% CI) — e.g. OR / RR / HR / proportion |
| **Heterogeneity** | I² = ___% &nbsp; τ² = ___ &nbsp; χ² p = ___ |
| **Subgroup analyses reported** | by subtype / by N status / by marker type / none |

## Quality and reporting

| Field | Value |
|---|---|
| **Risk-of-bias tool used in the SR** | Cochrane RoB 1 / RoB 2 / QUADAS-2 / ROBINS-I / NIH NHLBI / Newcastle-Ottawa / other |
| **GRADE assessment of evidence reported?** | Yes (table provided) / No |
| **Funding source** | Public / industry / mixed / none / NR |
| **Conflict of interest declared** | None / present / NR |

## Synthesis and conclusions

| Field | Value |
|---|---|
| **Authors' main conclusion (verbatim, ≤2 sentences)** | _quote_ |
| **Clinical implication for axillary de-escalation** | _free text_ |

## Umbrella-review appraisal cross-link

| Field | Value |
|---|---|
| **AMSTAR-2 overall confidence** | High / Moderate / Low / Critically Low — see `02_amstar2/amstar2_scores.csv` |
| **Risk of overlap with other included SRs** (CCA, Pieper 2014) | _calculated in supplementary_ |

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## Notes for completion

- Extract from the **most recent full text + supplementary materials** when available.
- For abstract-only records, mark unrecoverable fields **NR (full text needed)** rather than guessing.
- If the SR pooled estimates separate cN0 vs. cN+, record both rows.
- If the SR is a pooled analysis (no formal MA), record the raw pooled rate and tag heterogeneity as "not assessed".
