Chest fat grafting side effects

Breast fat grafting involves transplanting one's own fat tissue, right?

Then, is there any possibility of rejection or similar reactions?

When I see people around who have had their breasts removed due to cancer or other reasons, they seem worried, so they don't undergo fat grafting.

Oh! Maybe it's because I need to put in a prosthesis..

I'm curious in many ways...

Since it's a procedure, the most concerning issue is probably the possibility of side effects.

The chest is important not only for appearance but also because it is directly connected to breastfeeding and health through hormones.