Charlotte Brosnan passed away last month after a battle with ovarian cancer, the same disease that killed her mother Cassandra Harris, the Irish actor's first wife, 22 years earlier, reported People magazine
According to Lisa Paulsen, president of the Entertainment Industry Foundation and Brosnan's longtime friend, the Hollywood star had hoped Charlotte would beat the cancer and pushed to get her into the latest clinical trials.
"Pierce was willing to pick up the phone and call anyone, go anywhere, take her anywhere, do anything for her at anytime. He was desperate. After Cassie passed away, Pierce became a fierce champion and ambassador to all things related to women's cancer research," Paulsen said.
"I told Pierce, 'Despite the fact that Charlotte didn't end up benefiting from long-term new ovarian cancer therapies, so many things that you have done have led to so many discoveries'. He's a remarkable and loving father, and Charlotte was such a trooper," Paulsen added.
Brosnan, who married second wife Keely Shaye Smith in 2001, paid tribute to his daughter shortly after her death, praising Charlotte for fighting the disease with "grace and humanity, courage and dignity".
She was Harris' daughter from a previous marriage, but Brosnan adopted her and her brother Christopher as his own after their father's death in 1986.