HealthAugust 7, 2026

pseudoprogression

SOO-doh-proh-GREH-shun

Definition

A temporary increase in the size of a tumor or the appearance of new lesions on imaging that is actually an inflammatory response to treatment, rather than an indication that the cancer is truly growing.

Etymology

Derived from the Greek prefix 'pseudo-', meaning 'false' or 'deceptive,' combined with 'progression,' from the Latin 'progredi,' meaning to go forward or advance.

In the news

The article suggests that early imaging might misidentify pseudoprogression as true tumor growth, which is critical because it could lead to the premature discontinuation of an effective immunotherapy.

BI-1808 Receives FDA Fast Track Designation in Ovarian Cancer

Read the full article ↗

Targeted Oncology

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