Kate, the Princess of Wales, has disclosed that she has cancer and is undergoing chemotherapy — though in a video announcement Friday, she did not say what kind of cancer or reveal details of her treatment.

Here’s what is known:

What kind of surgery did Kate have?

Kate had what was described as abdominal surgery on Jan. 16. The news wasn’t announced until the next day, when Kensington Palace revealed that Kate was recovering from a planned operation.

At the time, officials said her condition wasn’t cancerous but did not specify what kind of surgery, saying only that it was successful.

When was Kate’s cancer found?

During the video announcement Friday, Kate said: “Tests after the operation found cancer had been present,” and that she was in the early stages of treatment.