investigational

American  

[in-ves-ti-gay-shuhn-uhl] / ɪnˌvɛs tɪˈgeɪ ʃən əl /

adjective

1. relating to, engaged in, or involving investigation, or any process of thorough examination, research, inquiry, etc.

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Example Sentences

Duodenal mucosal resurfacing is an investigational endoscopic treatment that uses controlled heat to remove damaged tissue from the inner lining of the duodenum, the first section of the small intestine just below the stomach.

From Science Daily • Apr. 23, 2026

The Food and Drug Administration on Friday declined to approve Replimune’s lead investigational immunotherapy, RP1, in combination with Bristol Myers Squibb’s Opdivo for the treatment of advanced melanoma.

From Barron's • Apr. 13, 2026

The Japanese pharma giant will co-develop one of Innovent’s late-stage investigational drugs, IBI363, initially for non-small cell lung cancer and colorectal cancer.

From The Wall Street Journal • Oct. 22, 2025

“Small samples like this aren’t good for establishing the benefits of a treatment, conclusively showing safety or demonstrating that an investigational treatment is better than placebo,” Conelea said.

From Los Angeles Times • Sep. 5, 2024

This question of compatibility between stock and scion is of the utmost importance and it impedes investigational work, complicating comparisons we are trying to make.

From Northern Nut Growers Association Report of the Proceedings at the Thirty-Seventh Annual Report Wooster, Ohio, September 3, 4, 5, 1946 by Northern Nut Growers Association