This study revealed that the ability of some ribosomal proteins was dependent on the phosphorylation status of serine 57 and/or 181 of PGRMC1 interactions with ribosomal proteins were also observed in pulldown experiments involving endometrial cancer cells with PGRMC1 interacting with many ribosomal proteins in endometrial cancer cell lysates (Table 3). Here, PGRMC1 is linked to endometrial cancer.