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Early response by MR imaging and ultrasound as predictor of pathologic complete response to 12‐week neoadjuvant therapy for different early breast cancer subtypes: Combined analysis from the WSG ADAPT subtrials
Author(s) -
Graeser Monika,
Schrading Simone,
Gluz Oleg,
Strobel Kevin,
Würstlein Rachel,
Kümmel Sherko,
Schumacher Claudia,
Grischke EvaMaria,
Forstbauer Helmut,
Braun Michael,
Christgen Matthias,
Adams Jascha,
Nitzsche Henrik,
Just Marianne,
Fischer Hans Holger,
Aktas Bahriye,
Potenberg Jochem,
Schumann Raquel,
KolbergLiedtke Cornelia,
Harbeck Nadia,
Kuhl Christiane K.,
Nitz Ulrike
Publication year - 2021
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.33495
Subject(s) - medicine , magnetic resonance imaging , breast cancer , neoadjuvant therapy , area under the curve , receiver operating characteristic , complete response , ultrasound , ki 67 , breast mri , cancer , nuclear medicine , pathology , radiology , chemotherapy , immunohistochemistry , mammography
We evaluated the role of early response after 3 weeks of neoadjuvant treatment (NAT) assessed by ultrasound (US), magnetic resonance imaging (MRI) and Ki‐67 dynamics for prediction of pathologic complete response (pCR) in different early breast cancer subtypes. Patients with HR+/HER2+, HR−/HER2− and HR−/HER2+ tumors enrolled into three neoadjuvant WSG ADAPT subtrials underwent US, MRI and Ki‐67 assessment at diagnosis and after 3 weeks of NAT. Early response was defined as complete or partial response (US, MRI) and ≥30% proliferation decrease or <500 invasive tumor cells (Ki‐67). Predictive values and area under the receiver operating characteristic (AUC) curves for prediction of pCR (ypT0/is ypN0) after 12‐week NAT were calculated. Two hundred twenty‐six had MRI and 401 US; 107 underwent both MRI and US. All three methods yielded a similar AUC in HR+/HER2+ (0.66‐0.67) and HR−/HER2− tumors (0.53‐0.63), while MRI and Ki‐67 performed better than US in HR−/HER2+ tumors (0.83 and 0.79 vs 0.56). Adding MRI+/‐Ki‐67 increased AUC of US in HR−/HER2+ tumors to 0.64 to 0.75. MRI and Ki‐67 demonstrated highest sensitivity in HR−/HER2− (0.8‐1) and HR−/HER2+ tumors (1, both). Negative predictive value was similar for all methods in HR+/HER2+ (0.71‐0.74) and HR−/HER2− tumors (0.85‐1), while it was higher for MRI and Ki‐67 compared to US in HR−/HER2+ subtype (1 vs 0.5). Early response assessed by US, MRI and Ki‐67 is a strong predictor for pCR after 12‐week NAT. Strength of pCR prediction varies according to tumor subtype. Adding MRI+/‐Ki‐67 to US did not improve pCR prediction in majority of our patients.