Moderna's mRNA-4359 vaccine, targeting advanced melanoma and solid tumours, shows potential in early trials, with 8 out of 16 patients experiencing no tumour growth. The treatment, using mRNA tech similar to COVID-19 vaccines, primes the immune system to recognize and fight cancer cells, with no serious side effects reported. The results, to be presented at a European oncology conference, mark an important step towards a new cancer treatment.