This year's Melanoma March Macarthur has been cancelled due to coronavirus concerns.
The event which was to be held at Camden Town Farm on Sunday, March 15 will no longer be going ahead this year.
Melanoma Institute Australia chief executive Matthew Browne said full refunds would be offered for registrations.
He said further information would soon be provided regarding that process.
"Due to the escalating impact of COVID-19, and in the interests of the health and safety of all participants and attendees, we have made the difficult decision to cancel all remaining Melanoma March events nationally," he said.
"This includes the seven events scheduled for this weekend - Melbourne, Bunbury, Bendigo, Coolangatta, Macarthur, Mackay, and Wagga Wagga.
"This decision has not been made lightly, however protecting the health of our dedicated community members and their families who run and attend these events, many of whom are cancer patients, is paramount."
Mr Browne said the institute would host a virtual Melanoma March on Sunday, March 29.
"We are planning to hold a virtual event to enable our community across Australia to still come together as we have done for Melanoma March for the last nine years," he said.
"We will provide more detail regarding this in the coming weeks.
"My sincere apologies and thanks particularly to our volunteer committees who work tirelessly to put on their local Melanoma March events every year."
For more information visit: www.melanomamarch.org.au.