The Royle Family star, who is undergoing treatment for lung cancer related to a genetic form of the disease, joked about the number of times she has faced the disease at a gathering in Manchester.Aherne said: "My brother and I were born with cancer of the eyes, the retina, my mum told us only special people get cancer. I must be very special because I have had it in my lungs and bladder as well."The comedienne gave a typically irreverent speech about her treatment and condition as she spoke to cancer patients, medics and carers at Manchester Town Hall for the launch of a new scheme to improve cancer care in the city.She described her own Macmillan cancer nurse, Julie Watts, as "like an angel,"She said: "When you hear them telling you you have cancer, it's true that you really don't take it in properly, you just don't think of the questions and then when you come out because she's been in there with you she answers all your questions that you haven't been able to ask at the time or haven't thought of."This is the best bit that they understand they completely understand what you are going through and what your family are going through."Aherne shared a joke from the time of her chemotherapy treatment at the Cecilia Centre at Wythenshawe Hospital, involving Royle Family co-star Ricky Tomlinson who played her on-screen father.Aherne said: "The cleaner came in one day, she went, 'Oh, I knew you were here, they told me you were here, oh that's great, I love the Royle Family but I would've much preferred it to be Ricky in that bed!'"She was wishing lung cancer on Ricky Tomlinson!"The 50-year-old, whose comedy creations have also included her spoof chat host Mrs Merton, revealed last month she was battling lung disease after agreeing to help launch the new initiative in her home town Manchester.