A double-stranded nucleic acid molecule for suppressing the expression of at least one of COX7RP and Efp genes which includes (a) a sense strand which includes a nucleotide sequence corresponding to a target sequence indicated by any one of SEQ ID Nos.: 1 to 38 and (b) an antisense strand which includes a nucleotide sequence complementary to that of the sense strand specified in (a); a cancer cell proliferation inhibitor with the double-stranded nucleic acid molecule and against at least one of uterine, breast and bladder cancer cells; and a pharmaceutical agent with the cancer cell proliferation inhibitor and against at least one of uterine, breast and bladder cancers.