Merck Stock Rises 6% as Lung Cancer Treatment Cuts Tumor Progression Risk Significantly

Aditya Raghunath4 minute read
Reviewed by: Thomas Richmond
Last updated May 24, 2026

Key Stats for Merck Stock

  • Price change for Merck stock: 6%
  • $MRK Share Price as of May. 22: $122
  • 52-Week High: $125
  • $MRK Stock Price Target: $130

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What Happened?

Merck (MRK) stock jumped 5.6% on Friday, closing at $122.41. Two separate cancer treatment developments drove the move.

  • First, European health officials recommended approving Merck’s Keytruda and Padcev combination for patients with muscle-invasive bladder cancer.
  • This matters because many of these patients — often elderly or too sick for harsh chemotherapy — currently have very few treatment options.
  • The recommendation brings Merck closer to offering a Keytruda-based regimen for this group, both before and after surgery.
  • Second, and arguably more exciting for investors, Merck released late-stage trial results for a drug called Sac-TMT.
  • Merck licensed this ADC from China’s Kelun Pharma back in 2022.
  • ADCs work by attaching toxic payloads to antibodies, directing chemotherapy-like damage directly at cancer cells while reducing harm to nearby healthy tissue.
MRK Stock Revenue, EBIT and Free Cash Flow Estimates in Billion USD (TIKR)

When Sac-TMT was combined with Keytruda and compared with Keytruda alone in lung cancer patients, 70% responded to the combination. That compares favorably with the 56%-58% response rate observed with standard chemo-plus-Keytruda regimens.

The combination also cut the risk of disease progression by 53% in patients with high levels of the PD-1 protein — the same protein Keytruda is designed to block.

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What the Market Is Telling Us About Merck Stock

Merck stock has faced a real question mark for years: what happens when Keytruda, its biggest drug, loses patent exclusivity? Keytruda is a massive revenue driver, and investors have been closely watching for its replacement.

Sac-TMT is one of the clearest answers Merck has offered so far. Leerink Partners analyst Daina Graybosch noted the results met expectations and support Merck’s “bio-better chemo” strategy.

She also pointed out that investors have been underwhelmed by Sac-TMT until now, which helps explain why Friday’s results moved Merck stock so sharply.

MRK Stock Valuation Model (TIKR)

The MIBC bladder cancer approval in Europe adds another near-term revenue opportunity on top of that.

Merck stock remains close to its 52-week high, but Friday’s move suggests the market is starting to price in a more diversified oncology pipeline — one that doesn’t rely entirely on Keytruda alone.

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How Much Upside Does Merck Stock Have From Here?

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Disclaimer:

Please note that the articles on TIKR are not intended to serve as investment or financial advice from TIKR or our content team, nor are they recommendations to buy or sell any stocks. We create our content based on TIKR Terminal’s investment data and analysts’ estimates. Our analysis might not include recent company news or important updates. TIKR has no position in any stocks mentioned. Thank you for reading, and happy investing!

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