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Table 1 Uniform terminology for tumour response categories

From: Improving radiologic communication in oncology: a single-centre experience with structured reporting for cancer patients

SOR category SOR threshold criteria RECIST 1.1 equivalent RECIST 1.1 threshold criteria*
Significant decrease of tumour burden ≥ 30% decrease in tumour burden and/or qualitative evidence of improvement Partial response (PR) ≥ 30% decrease in tumour burden (compared with baseline)
Slight decrease of tumour burden ≥ 10–30% decrease in tumour burden and/or qualitative evidence of moderate improvement n.a. n.a.
No significant change of tumour burden Absence of quantitative or qualitative change of tumour burden Stable disease (SD) Criteria for PR and PD are not met
Slight increase of tumour burden ≥ 10–20% increase in tumour burden and/or qualitative evidence of moderate worsening n.a. n.a.
Significant increase of tumour burden ≥ 20% increase in tumour burden and/or qualitative evidence of remarkable worsening Progressive disease (PD) ≥ 20% increase in tumour burden (compared with nadir)
  1. SOR structured oncology report, RECIST response evaluation criteria in solid tumours, n.a. not available
  2. *In extracts; for full reference see [13]