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  1. Dictionary of Cancer Terms - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65951
    ... 3D-CRT 3F8 3T MRI 3’-deoxy-3’-(18F) fluorothymidine 4-demethoxydaunorubicin 4-hydroxytamoxifen 4-nitroquinoline 1-oxide 4-NQO 44369 45 CFR 46 45 Code of Federal Regulations Part 46 5-alpha reductase inhibitor 5-fluoro-2-deoxycytidine 5-fluorouracil 5-FU 5-FU- ...