The treatment of 4T1 tumor-bearing mice with calcitriol seemed to increase the expression of the mannose receptor C-type 1 (Mrc1) gene in TAMs and BMDMs, with the highest expression of this gene observed in TAMs from 1000 IU + cal group and in BMDMs from the 100 IU + cal group (Fig. 4A and B); this observation was confirmed in the qPCR analysis of 4T1 BMDMs (Fig. 4C). The gene discussed is MRC1; the disease is neoplasm.