How many target lesions are measured in RECIST 1.1?

Up to 5 target lesions total, maximum 2 per organ, selected as the largest measurable lesions. Minimum size: 10 mm short axis for lymph nodes, 10 mm longest diameter for other lesions. Non-target lesions are assessed qualitatively.

What is the unconfirmed PR rule in RECIST 1.1?

Progressive disease requires confirmation only for subjects where response is CR or PR; PD does not require confirmation. However, if a trial design requires confirmation of CR/PR, a second assessment at 4+ weeks is needed. For PD, new lesions always confirm PD.

RECIST 1.1 PR/CR/SD/PD Response Thresholds

Apply RECIST 1.1 criteria to measure solid tumor response: CR (disappearance), PR (30% decrease), PD (20% increase plus 5 mm absolute), SD (neither PR nor PD) from sum of target lesion diameters.

Use the full interactive calculator below, or

Related Calculators

iRECIST

Medical Long-tail

Deauville Score

Medical Long-tail

RECIST 1.1 PR/CR/SD/PD Response Thresholds

Related Calculators

Frequently Asked Questions

How many target lesions are measured in RECIST 1.1?

What is the unconfirmed PR rule in RECIST 1.1?