VDR and cancer: Unifocal BC patients with a VDR expression were tested to be more often graded G1 with a well-differentiated tumor (p = 0.020), also staged according to TNM more frequently pT1 (p = 0.035), which means a primary tumor size of 2 cm or less and pN0 (p = 0.032), meaning there are no cancer cells in any nearby lymph nodes.