There are multiple definitions:

1. thyroid transcription factor(English)

   • Thyroid and parathyroid, Transcription

2. time to first [cigarette of the day](English)

   • CPD, FTND, FTQ, HSI
   • Addiction and health
   • https://doi.org….1991.tb01879.x

3. time to fatigue(English)

   • AO, PPO
   • Fatigue, Sports medicine
   • https://doi.org…627.2011.608050

4. time-to-treatment failure(English)

   • defined as progression, premature temozolomide discontinuation for toxicity, or death from any cause
   • MGMT, PFS-6, TMZ
   • Therapeutic approaches, Oncology, Prognosis
   • https://doi.org…432.CCR-14-2737