Merck and Moderna say cancer vaccine shows promise in preventing recurrence of melanoma​Merck and Moderna say cancer vaccine shows promise in preventing recurrence of melanoma 

 Pharmaceutical giants Moderna and Merck said that an experimental vaccine treatment has shown signs of preventing skin cancer from returning or spreading in a study of melanoma patients.  ​​Pharmaceutical giants Moderna and Merck said that an experimental vaccine treatment has shown signs of preventing skin cancer from returning or spreading in a study of melanoma patients.