Ausstralian pop star Kylie Minogue, who is battling breast cancer at the Institute Gustave-Roussy in Paris, may have to undergo mastectomy, according to reports.Minogue has undergone a lumpectomy to remove the cancerous tissue and is currently under chemotherapy -- but she may well also have to have a mastectomy.Kylie's mother Carol flew to Paris to be with the star.'At this time, I think any woman in the world would want their mum with them, and likewise there is nowhere her mum would rather be. Kylie and her mother are incredibly close,' a friend of the singer was quoted by Daily Mail as saying.Despite the severity of her condition, the singer issued a statement last week staunchly denying rumours that she was 'depressed' and that she was seeking treatment from an alternative medicine guru Nish Joshi, who uses the controversialpractice of 'cupping.'The statement said: 'Despite the wealth of rumours to the contrary, Kylie is in good spirits and is as healthy as can beexpected whilst undergoing her treatment regime in Paris.'It also denied that she had 'sought alternative methods of treatment,' saying that she 'was concerned that other suffererswould be misled by such reports.'