Emmy-winning “Seinfeld” and “Veep” star Julia Louis-Dreyfus has been diagnosed with breast cancer, according to a note the actress posted Thursday on Twitter.

“1 in 8 women get breast cancer. Today, I’m the one,” she wrote. “The good news is that I have the most glorious group of supportive and caring family and friends, and fantastic insurance through my union. The bad news is that not all women are so lucky, so let’s fight all cancers and make universal health care a reality.”

Louis-Dreyfus, 56, recently appeared at the Emmy Awards, where she picked up her sixth consecutive trophy for best comedy actress for HBO’s “Veep.” She plays the embattled politician Selina Meyer in an extremely accurate parody of Washington culture. “Veep,” which will wrap up in 2018 with its seventh and final season, also won best comedy for the third year in a row.

“For a long time, I thought, maybe we should do eight seasons,” Louis-Dreyfus said after the Emmys. “But then creatively when we were talking about stories, it really felt like there was a finality.”

“Our love and support go out to Julia and her family at this time,” HBO said in a statement. “We have every confidence she will get through this with her usual tenacity and undaunted spirit, and look forward to her return to health and to HBO for the final season of ‘Veep.’ ”

After Louis-Dreyfus posted the news on Thursday, responses poured in, including one from Joe Biden: