Moderna and Merck shares slump after melanoma vaccine data leaks

FinanceInternationalEL PAÍSOct 22, 2026, 2:41 PM40 s readAI summary

Moderna and Merck shares fell after data on their personalized melanoma vaccine disappointed Wall Street. Moderna dropped as much as 26% on Thursday, a record intraday decline, while Merck slipped 3.9%. The data leaked ahead of schedule and were later confirmed by Merck: the vaccine reduced the risk of cancer recurrence by 42% and the risk of metastasis by 38%. The results were due to be presented on Saturday at the European Society for Medical Oncology meeting in Madrid.

In 40 seconds

Moderna fell as much as 26% intraday, a record, and Merck slipped 3.9% after the data emerged.
The vaccine reduced the risk of cancer recurrence by 42% and the risk of distant spread by 38%.
The data leaked on social media platform X ahead of schedule and Merck later confirmed them.

Read the full story at EL PAÍS

IASummary generated by artificial intelligence from a story by EL PAÍS. It may contain errors: the original source prevails.

Moderna
Merck
farmacéuticas
mercados
oncología

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Moderna and Merck shares slump after melanoma vaccine data leaks

In 40 seconds

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Keep reading

IMF backs economic rescue bill as Banco de la República calls for rigor in its review

Parks and attractions in Colombia generated US$1.095 billion in 2024, according to IAAPA

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