Improving the lives of those suffering from kidney disorders is being debated at a rally of patients and medics.
The renal centre should increase transplants from 89 to 160 a year
The event in Swansea comes a month after the assembly government said it would fund a renal transplant centre.
The centre, at the University Hospital of Wales in Cardiff, will almost double the number of kidney transplants carried out every year by 2012.
But campaigners say they still want a change in the law over the issue of presumed consent for kidney donation.
Calls for better facilities for dialysis patients in Wales are expected to be made at the rally.
Allison John, the first person in the UK to have a heart and lungs, liver and kidney transplant, is leading the Kidney Wales Foundation's People Like Us campaign.
She said: "We have campaigned hard over the last five months to improve the lives of kidney patients all over Wales and we are pleased to see that politicians have listened to us.
"However there is still lot to be done and we will now be working hard to get a 'yes' for presumed consent and to make more improvements to the lives of dialysis patients, many of whom are still travelling long distances and receiving treatment in poor facilities."
Last year 89 kidney transplants were carried out at the University Hospital of Wales.
The £4.2m investment in a 21-bed renal transplant centre is estimated to lead to 160 transplants annually by 2012.
The first phase of the development will allow for up to 115 transplants every year and could be ready as early as March this year.