Biotech Stock Rockets; Cancer Drug Shrinks All Tumors In One Key Test

Merus stock briefly broke out to a nine-month high Thursday after the biotech’s experimental drug shrank tumors in every head-and-neck cancer patient in an early-stage test.


Notably, one patient showed a complete response after the study’s data cutoff date. This means the patient showed no detectable signs of cancer. Three other patients showed partial responses.

“We caveat that the data remain early, and responses were not centrally reviewed, however, Merus (MRUS) noted that all patients showed a reduction in tumor size which supports the promise of real (effectiveness),” RBC Capital Markets analyst Brian Abrahams said in a report to clients.

In midday action on today’s stock market, Merus stock rocketed 31.2% near 26.20. Earlier, shares soared almost 49%.

Merus Briefly Tops Buy Point

The Merus drug, now known as MCLA-158, has a dual function. It targets a protein called EGFR and a receptor called LGR5. The former is a common cancer marker, while the latter is a cancer stem cell antigen, RBC’s Abrahams said.

Overall, Merus enrolled 10 patients in its Phase 1 study. But the company has enrolled 29 patients across studies of various tumor types. In that bigger group, 72% experienced side effects. Most of those were related to the infusion. Just 7% experienced more severe side effects, a bullish note for Merus stock.

Abrahams compared the results to a rival medicine from Hookipa Pharma (HOOK). Last year, Hookipa said its experimental drug resulted in an 18% response rate for head-and-neck cancer patients. Those patients had progressed following two previous treatments. Merus is treating a similar population.

The early-stage data from Merus’ study “suggests to us that MCLA-158 has the potential to double the response rate,” Abrahams said. He has a sector perform rating and 21 price target on Merus stock.

Preclinical Data Also Promising

Merus also unveiled preclinical data from its drug, known as zeno. Most investors in Merus stock are interested in this drug, Abrahams said.

Laboratory data suggests zeno can block cell growth 100-fold more potently than other drugs that target a slightly different protein.

“We look for further updates this year on MCLA-158 and additional updates in 2022 across MCLA-158 and zeno to help de-risk the early-stage nature of their pipeline, but believe shares continue to fairly balance the reward/risk,” he said.

On the news, Merus stock broke out of a cup-with-handle base, briefly topping a buy point at 27.90, according to

Follow Allison Gatlin on Twitter at @IBD_AGatlin.


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