The decision was made due to concerns over the "high risk to public health" of coronavirus or COVID-19.

This year's stars are: the teachers at St John's College, Jordan Primmer, Tiffany Vanstone, Errin Williamson, Sally Matthews, Maddie Langley, Leisa Ross, Jasanna Pilon and Cara Grey.

They have already raised more than $4600 for the Cancer Council in the lead up to the event.

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"Nothing is more important to us than the health of our supporters - your safety must come first," a Cancer Council spokesperson said.

"After taking advice from leading health professionals and knowing that many who attend our events are in a higher risk group, we're confident that this decision is in the best interests of everyone involved, as well as the wider NSW community."

Earlier in the week the Australian government banned indoor gatherings of more than 100 people to help slow the spread of the virus.

The Cancer Council spokesperson said they were grateful for the continued support and understanding and they apologised for any inconvenience or disappointment the decision caused.

"Our local teams will work closely with our stakeholders to agree whether to postpone the event until later in the year, or to another time, and we appreciate your patience as we work through this. If you have any questions about your event, please contact Ricky Puata on (02) 6392 0800, they said.

The Cancer Council also encouraged those with cancer or their loved ones to call the information and support line on 13 11 20 if they were concerned about COVID-19 to speak to a trained health professional.