POLD1 and endometrial cancer: To study the effects of different POLD1 transcripts (POLD1-L and POLD1-S) on the biological behavior of endometrial cancer cells, overexpression vectors for the full-length POLD1-L transcript (NM_002691) and truncated POLD1-S transcript (amino acids 1 and 940, from the start codon to exon 22) were constructed.