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CDK4/6 inhibitors have an established role in the treatment of hormone receptor positive HER2-negative advanced breast cancer. All studies conducted in metastatic breast cancer showed a benefit in delaying progression when added to standard endocrine therapy, regardless of therapy line, pretreatment, menopausal status, site of metastasis, CDK4/6 inhibitor used and associated endocrine therapy. A benefit in overall survival has also been demonstrated. In early breast cancer, only the MonarchE study has shown an improved invasive disease-free survival with abemaciclib taken for 2 years, whereas the Penelope-B did not meet the primary endpoint and the PALLAS study was terminated early for futility. Studies conducted in the neoadjuvant setting might help to explain the discordant results.
Following publication of the data presented by von Minckwitz and colleagues it has been brought to our attention that some patients should be scored differently. Stable disease was seen in three of the eighteen patients instead of two of the eighteen patients: one patient with transitional cell carcinoma treated at 4 µg/kg scFv(FRP5)-ETA per day, and two breast cancer patients treated at 4 and 12.5 µg/kg scFv(FRP5)-ETA per day. Disease progression occured in 9 of the eighteen patients evaluated (see corrected Table 2 overleaf). This does not affect the conclusions of our study. In addition we would like to correct the following errors: patient IDs for patients U01 and U02 in the original Table 2 were interchanged. In addition, patient N03 had a grade 3 elevation of gamma-glutamyl transferase, and not grade 2 (see corrected Table 2 overleaf).