By Mark Landler

LONDON — Catherine, the Princess of Wales, announced Monday (9) that she had completed chemotherapy for her cancer, lifting a cloud from the British royal family after an anguished period in which she and her father-in-law, King Charles III, had both been stricken with serious illness.

Speaking in a video, Catherine, who is known as Kate, said, “As the summer comes to an end, I can’t tell you what a relief it is to have finally completed my chemotherapy treatment”.

“Doing what I can to stay cancer-free is now my focus,” she continued. “Although I have finished chemotherapy, my path to healing and full recovery is long and I must continue to take each day as it comes.”

The videotaped announcement was highly personal, offering home movie-style glimpses of Kate with her husband, Prince William, and their children. But it left many questions unanswered: whether her doctors have declared her medically free of cancer; whether she is still undergoing other forms of treatment; and her prognosis for a full recovery.

Kensington Palace did not indicate that Kate was cancer-free. And officials did not offer further details on the princess’ medical condition, citing her right to privacy. It has never confirmed what type of cancer she was being treated for, how far the disease had progressed, or the full details of her treatment, beyond chemotherapy.

Kate said she looked forward to returning to work and will undertake a limited schedule of public events for the rest of the year. She is expected to attend a ceremony honouring those killed in war at the Cenotaph monument in November, one of the most sombre dates on the royal calendar.

“The last nine months have been incredibly tough for us as a family,” Kate said. “Life as you know it can change in an instant, and we have had to find a way to navigate the stormy waters and road unknown.”

The announcement, filmed last month by Will Warr, a London-based videographer who specializes in wedding videos, put the emphasis on recovery and family rather than clinical details. Shot in gauzy light with a mix of soft-focus and newsreel-style images, the video showed Kate playing with her children, resting her head on William’s shoulder, and walking through a field of waving grain.

Kate, 42, spoke in a voice-over about her ordeal, which began after Christmas when she entered a hospital for abdominal surgery.

“The cancer journey is complex, scary and unpredictable for everyone, especially those closest to you,” Kate said. “With humility, it also brings you face to face with your own vulnerabilities in a way you have never considered before, and with that, a new perspective on everything.”

Over footage of her son Prince George scampering up a pile of logs, the family laughing as they played cards around a kitchen table with Kate’s parents, frolicking on the beach, and walking hand-in-hand through forest and fields, Kate characterized her illness as having pulled her focus back to the things that matter.

“This time above all reminded William and me to reflect and be grateful for the simple yet important things in life, which so many of us often take for granted,” Kate said. “Of simply loving and being loved.”

Charles, who announced in February that he, too, had been diagnosed with cancer, has returned to public duties, though Buckingham Palace has not yet said whether he continues to undergo treatment. His wife, Queen Camilla, offered the closest thing to a health update last week when she said of her husband, during a visit to a cancer centre in Bath, “He’s doing very well.”

Kate’s tentative return to public life began in June when she attended Trooping the Colour, a military parade that honours the birthday of the sovereign. She rode in a state carriage to watch the parade with her three children, George, Princess Charlotte and Prince Louis.

Hopes for Kate’s condition rose when she made a second public appearance in July, on the final day of the Wimbledon tennis tournament. She won an enthusiastic standing ovation from spectators, including actor Tom Cruise, as she entered the gallery. Later, in her role as the royal patron of the All England Lawn Tennis and Croquet Club, Kate presented the Challenge Cup to the men’s singles champion, Carlos Alcaraz of Spain.

Still, Kate has tried to manage public expectations about her recovery since she spent 14 days in a hospital and announced the cancer diagnosis in March.

“I am making good progress,” she said in a statement issued the day before she took part in the military parade, “but as anyone going through chemotherapy will know, there are good days and bad days.”

“On those bad days you feel weak, tired and you have to give in to your body resting,” Kate added. “But on the good days, when you feel stronger, you want to make the most of feeling well.”

Kensington Palace, where Kate and William have their offices, has pleaded with the news media to respect her privacy, following weeks of breathless rumours about her condition and even whereabouts earlier in the year. There has been relatively little speculation since she announced her diagnosis in March in a stark pre-recorded video.

-New York Times