In another attempt at passing breast density notification legislation, the California Senate passed a bill on May 29 that would require women with dense breast tissue to be informed of their status, according to a statement from the bill's author, Sen. Joe Simitian (D-Palo Alto).
SB 1538 would require that following a mammogram, women with dense breast tissue are informed that dense breast tissue can obscure abnormalities on a mammogram, and that they may wish to discuss the potential value of additional screening with their doctors, Simitian said.
The bill passed the Senate by unanimous vote; the legislation now heads to the California Assembly.
Gov. Jerry Brown vetoed a similar bill in October of last year. Since then, Virginia has joined the list of states with breast density notification laws, and two separate studies from the first year of a similar law's implementation in Connecticut have shown a 100% increase in breast cancer detection rates in women with dense breast tissue who had supplementary screenings, according to Simitian's statement.
"My hope is that we can get to 'yes' this year and that we can begin saving lives as soon as possible," he said. "This bill simply requires that information that is already shared between doctors also be shared with a patient herself. This is about a patient's right to know. It is about giving patients the information they need to be effective advocates for their own health."











![A normal mammogram confirmed by three-year radiologic follow-up illustrates reader-marked regions of interest (ROIs) during (A) unaided (round 1) and (B) artificial intelligence (AI)–assisted (round 2) reading. Each colored dot represents an ROI for recall by a human reader. Readers could mark more than one ROI per case, represented by multiple dots of the same color. During AI-assisted reading, the AI system displayed three visible prompts: two with suspicion of malignancy scores of 35% (left mediolateral oblique [L MLO] and craniocaudal [L CC]) and one with a suspicion of malignancy score of 10% (right craniocaudal [R CC]), shown as polygonal overlays. Without AI, six of 10 readers (60%) marked a false-positive ROI. With AI assistance, this fell to two of 10 (20%). R MLO = right mediolateral oblique.](https://img.auntminnie.com/mindful/smg/workspaces/default/uploads/2026/07/2026-07-14-radiology-mammogram-ai-auto-bias.H0bYO8QlWs.jpg?auto=format%2Ccompress&fit=crop&h=112&q=70&w=112)





