Calculators · Oncology · Classification

RECIST 1.1 target-lesion response

Also called RECIST, RECIST 1.1, tumour response criteria

Classifies target-lesion response (CR, PR, SD, PD) from the sum of diameters at baseline, nadir and now, plus new lesions.

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Formula and scoring

CR: disappearance of all target lesions; nodes <10 mm short axis. PR: ≥30% decrease in sum from BASELINE. PD: ≥20% increase from the NADIR (smallest sum on study, including baseline) AND absolute increase ≥5 mm, or any new lesion. SD: neither.

Exam and ward pearls

  • PR is measured against baseline; PD against the nadir — the commonest exam trap.
  • RECIST 1.1: maximum 5 target lesions (2 per organ); nodes are measurable at ≥15 mm short axis and are measured by short axis.

When not to rely on it

  • Not for immunotherapy pseudo-progression (use iRECIST), lymphoma (Lugano), or mesothelioma/GIST/HCC-specific criteria (mRECIST, Choi).

Source

  1. Eisenhauer EA, Therasse P, Bogaerts J, et al. New response evaluation criteria in solid tumours: revised RECIST guideline (version 1.1). Eur J Cancer. 2009;45(2):228-47. doi:10.1016/j.ejca.2008.10.026 · PMID 19097774

Formula and cut-offs checked against these sources on 8 Nov 2026. Educational tool for clinicians; it does not replace clinical judgement.

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