Sweden's royal palace has announced that Princess Christina, the older sister of King Carl XVI Gustaf, has been diagnosed with cancer.
The princess, 73, is suffering from chronic leukaemia, the palace confirmed in a statement.
Christina will undergo treatments this fall but she is otherwise feeling "relatively good", they added.
As a result she will scale back her royal duties and commit to engagements when her health permits.
"Princess Christina and her family hope [that the public] understand the situation and let the princess undergo the necessary treatment in peace," the palace concluded.
Following the announcement Prince Daniel, Crown Princess Victoria's husband, told Expressen: "It's incredibly sad, and for all who have been affected by a disease itself or of a loved one then you know that it is incredibly heavy and hard. We'll keep our fingers crossed as we can for her to be healthy."
This is the second time Christina has been diagnosed with cancer. In 2010 she revealed that she had undergone treatment for breast cancer, including three surgeries, and had beaten the disease. She has since campaigned for cancer issues.
The princess, who is known as Christina Magnuson, is married to Tord Gösta Magnuson. She lost her style of Royal Highness upon her marriage to someone of unequal rank, but her brother the king gave her the courtesy title of Princess Christina, Mrs. Magnuson.
She and Tord have three sons together – Carl Gustaf Victor, Tord Oscar Frederik and Victor Edmund Lennart.