Quotes from a clinical trial report (JGOG3022 trial):
Follow-up was terminated in February 2017 and data were locked in October 2017. Of the 346 patients enrolled, ineligible patients and patients who did not receive bevacizumab were excluded, and the remaining 333 patients were classified as treated patients. They were divided into the primary analysis cohort (n = 293) and the exploratory analysis cohort (n = 40) (Fig. 1). The reasons for discontinuation of bevacizumab at the time of data cut-off were completion of the planned treatment schedule (34.8%), progression of the primary disease (26.6%), serious adverse events (14.0%), refusal by the patient because of adverse events (5.5%), and refusal by the patient for reasons other than adverse events (3.8%).
Do the authors mean the same by "data were locked" and "data cut off", or are these distinct procedures?