A groundbreaking study has revealed a remarkable decline in the number of moles on children's bodies, offering a glimmer of hope in the fight against melanoma. This long-term Australian research project has found that the average mole count in children has almost halved over a 25-year period, suggesting a significant reduction in their risk of developing melanoma later in life.
Scientists from the QIMR Berghofer Medical Research Institute have been tracking mole development in twins and their siblings, aged 12 or 13, annually from 1992 to 2016. The results are astonishing: the average mole count plummeted from 87 in 1992 to a mere 46 in 2016, a reduction of 47%. This study, involving almost 4000 children from sunny southeast Queensland, was published in the British Journal of Dermatology.
Australia, known for its high rates of melanoma, has seen approximately 1,300 deaths annually from this skin cancer. Mole count is a critical indicator of lifetime melanoma risk, especially for fair-skinned populations exposed to high UV radiation.
But here's where it gets controversial: the researchers believe the most likely reason for this drastic drop in mole counts is reduced sun exposure for children before the age of 12. Campaigns like Slip, Slop, Slap and other sun prevention measures are thought to be the key drivers of this change.
The researchers estimate that an 11% reduction in sun exposure over 25 years could lead to the observed decline in mole numbers. Interestingly, changes in ethnicity and skin color across the population were not found to be significant factors in this decrease.
Geneticist Nick Martin, who led the study, emphasized the impact of these findings: "The success of the Slip, Slop, Slap campaign shows how science can inform effective public health campaigns that change habits and save lives in the future."
And this is the part most people miss: the researchers speculate that this reduction in mole counts over a quarter of a century should lead to a fourfold drop in lifetime melanoma risk for those born this century compared to those born in the 1980s.
Professor Martin described their research as the longest-running twin study in the world focused on mole counts. "It's only with this longitudinal perspective that we can see this trend," he said.
While the findings are encouraging, skin cancer expert Rachel Neale, based at QIMR Berghofer, emphasizes the importance of continued sun protection throughout one's lifespan. "We must build on this and continue to protect our skin as we age. We do a great job with our younger children, but we need to maintain these habits as we grow older."
Professor Neale also highlights the need for a holistic approach to sun protection, beyond just sunscreen. "Clothing and hats are crucial, and sunscreen should be a backup for the areas we can't cover."
The Slip, Slop, Slap campaign has been hailed as a major contributor to this positive trend. Kate Clark, who participated in the study with her twin brothers in the 1990s, believes the campaign should be rejuvenated to educate the latest generation. "I feel it's dropping off, and we're seeing fewer people wearing hats and caring for their skin."
Epidemiologist Anne Cust, from the Melanoma Institute of Australia, praises the research as "really important." She notes that Australia's melanoma rates have been reducing in people under 40, and the Slip, Slop, Slap campaign is thought to be a major reason for this.
Apart from its impact on moles and sun safety, the Brisbane Longitudinal Twin Study has made significant contributions to understanding genetic and environmental factors in other disorders, including anorexia.
So, while this study offers hope for a future with reduced melanoma risk, it also serves as a reminder of the importance of sun safety and the power of public health campaigns. What are your thoughts on this? Do you think these findings will encourage a renewed focus on sun protection, especially for the younger generation?
