Which cancers are linked to hair relaxer lawsuits?

Short answer: The cases mainly involve uterine cancer (including endometrial cancer) and ovarian cancer. In the NIH Sister Study of 33,497 women, frequent straightener users had an estimated 4.05% risk of uterine cancer by age 70, compared with 1.64% for women who never used them.

The study did not identify brands or ingredients, and researchers called for more work to confirm the findings.

SourcesNIH Sister Studynih.gov

Checked against primary sources on November 12, 2026 by Mason Arnao. This is general information, not legal advice. Related: Payout per person.

Your deadline runs even before the 2027 trial

The first hair relaxer bellwether trial is set for September 7, 2027, but state filing deadlines keep running in the meantime. Waiting for a verdict can cost you a claim. Court minute order

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Mason Arnao

About Mason Arnao

Mason David Arnao Mason David Arnao is an American entrepreneur, software engineer, and business executive based in Stuart, Florida. His career spans more than two decades in technology, automation, and lead generation systems. Arnao began his professional journey in the late 1990s as a computer technician for the National Basketball Association (NBA), where he was responsible for linking scoreboards, officials’ laptops, and stat monitors to broadcast networks. His technical precision and systems knowledge led him to join Professional Hospital Supply as a software engineer. There, he developed applications that improved data flow between medical suppliers and healthcare institutions, solidifying his foundation in enterprise-grade software development. By the early 2000's, Arnao advanced into web and SaaS infrastructure through Website Buddy LLC, a Florida-based development firm focused on building web tools for small businesses and online marketers. The experience refined his understanding of user-driven software and scalable online systems. In 2013, Arnao founded Waypoint Software, LLC, headquartered in Stuart, Florida. As President and Managing Partner, he built the company into a recognized provider of lead generation and real-time lead distribution technology. Waypoint’s software automates the acquisition, validation, and routing of consumer inquiries for marketing firms and data aggregators worldwide. The company serves hundreds of clients and is listed by the Better Business Bureau under “Sales Lead Generation.” Through Waypoint Software, Arnao has become a notable figure in the digital lead industry, combining technical engineering with automation strategy. His focus on system reliability, transparent data flow, and scalable integrations continues to position Waypoint as an industry leader in real-time lead management solutions.