Research summaries – Signal Engine

Here we publish source-bound cancer-research summaries produced from Signal Engine deep searches and deep analyses. Deep research has two levels: first-round and second-round. These are not news items and not standalone scientific publications; they are structured syntheses of evidence found in the literature, clinical trials, and experimental research. The system does not diagnose and does not choose treatment.

First-round deep research: mapping literature and clinical evidence. How does the treatment strategy for hormone receptor-positive, HER2-negative advanced or metastatic breast cancer change according to disease biological characteristics, endocrine resistance, prior therapies, and molecular alterations such as ESR1, PIK3CA, AKT1, or PTEN alterations?

2026-09-08

Extracted mechanistic / response-determinant data (in detail, not a HR dump): In the CAPItello-291 trial, capivasertib plus fulvestrant demonstrated a statistically significant progression-free survival benefit in pretr…