Task E2 · multi hop synthesis

Chain together, using two separate documents in the corpus, how a BRCA2 germline pathogenic variant creates a specific drug-treatable vulnerability: what DNA repair process does BRCA2 support, and what class of drug exploits its loss?

Gold evidence

Acceptable answer concepts

BRCA1/2 pathogenic variants relate to homologous recombination repair (HRR) genes
PARP inhibitors target homologous recombination deficiency (HRD)
the two documents must both be cited, not just one

Construction note

A genuine cross-document hop (unlike E1's within-document case): PMID:42652125 establishes BRCA1/2 as homologous-recombination-repair (HRR) genes; PMID:42648415 establishes PARP inhibitors as exploiting homologous recombination deficiency (HRD). Neither document alone states the full BRCA2-to-PARPi chain.

How each architecture answered

Baseline 0 · no retrieval

Yuu no Sekai · 558 tokens · 4.4s

Based on general biomedical knowledge, BRCA2 is involved in homologous recombination (HR), a critical DNA repair process. The loss of BRCA2 function leads to defects in HR, creating a vulnerability that can be exploited by PARP inhibitors, which are a class of drugs that target DNA repair deficiencies.

factualrejectedconf 0.90

BRCA2 supports homologous recombination (HR) as a DNA repair process.

hypothesisverifiedconf 0.80

The loss of BRCA2 function creates a vulnerability that can be exploited by PARP inhibitors.

run_failed: 0claim_support_rate: 0%unsupported_claim_rate: 100%abstention_correct: 100%concept_coverage: 33%

Baseline 1 · retrieve + synthesize

Yuu no Sekai · 3001 tokens · 4.0s

query(ies): Chain together, using two separate documents in the corpus, how a BRCA2 germline pathogenic variant creates a specific drug-treatable vulnerability: what DNA repair process does BRCA2 support, and what class of drug exploits its loss?

PMID:42575068 PMID:42530926 PMID:31792264 PMID:42652125 PMID:42656272

BRCA2 supports the homologous recombination repair process, and its loss can be exploited by PARP inhibitors.

factualverifiedconf 1.00

BRCA2 supports the homologous recombination repair process.

PMID:42652125Direct support

relationverifiedconf 1.00

The loss of BRCA2 creates a specific drug-treatable vulnerability that is exploited by PARP inhibitors.

PMID:42656272Indirect support

run_failed: 0retrieval_recall_at_k: 50%retrieval_mrr: 25%claim_support_rate: 100%unsupported_claim_rate: 0%citation_precision: 100%source_validity_rate: 100%abstention_correct: 100%concept_coverage: 0%

Agent 1 · planner + retrieve + synthesize

Yuu no Sekai · 3332 tokens · 5.6s

query(ies): BRCA2 germline pathogenic variant DNA repair process | drug class exploits BRCA2 loss treatable vulnerability

PMID:42652125 PMID:42642214 PMID:31792264 PMID:42653063 PMID:42530926

planner → {"queries": ["BRCA2 germline pathogenic variant DNA repair process", "drug class exploits BRCA2 loss treatable vulnerability"]}

BRCA2 supports the homologous recombination repair (HRR) process, and its loss creates a vulnerability that is exploited by PARP inhibitors.

factualverifiedconf 0.95

BRCA2 supports the homologous recombination repair (HRR) process.

PMID:42652125Direct support

relationverifiedconf 0.85

The loss of BRCA2 creates a vulnerability that is exploited by PARP inhibitors.

PMID:42652125Direct support

run_failed: 0retrieval_recall_at_k: 50%retrieval_mrr: 100%claim_support_rate: 100%unsupported_claim_rate: 0%citation_precision: 100%source_validity_rate: 100%abstention_correct: 100%concept_coverage: 0%