1 Table S1. Variation in the expression pattern of abundantly expressed miRNAs across 2 different samples. 3 Samples Patient 1-tumor Patient 1-normal Patient 2-tumor Patient 2-normal Patient 3-tumor Patient 3-normal Patient 4-tumor Patient 4-normal Patient 5-tumor Patient 5-normal Patient 6-tumor Patient 6-normal Patient 7-tumor Patient 7-normal Normal-serum 1 (10 mixed) Normal-serum 2 (10 mixed) Normal-serum 3 (10 mixed) Tumor-serum 1 (10 mixed) Tumor-serum 2 (10 mixed) Abundantly expressed miRNAs 34 37 39 47 47 35 43 43 48 44 50 45 46 50 54 47 52 56 55 All the expressed miRNAs 626 395 656 234 736 231 354 524 301 274 206 187 192 330 490 206 263 331 341 4 Relative expression levels of these involved abundantly expressed miRNAs are at least 0.30% in the sample. 5 6 Moreover, numbers of all the expressed miRNAs are also listed here. 7 Table S2. Aberrantly expressed miRNA species in breast cancer tissues based on their 8 adjacent normal tissues in the 7 patients. 9 Sample (patient) Up (13) P 1 Aberrantly expressed miRNAs miR-223, miR-761, miR-222, miR-21, miR-23b, miR-29c, miR-29b, miR-192, miR-23a, miR-29a, miR-125b, miR-129-3p, miR-142-5p miR-1287, miR-188-5p, miR-455-5p, miR-1273, miR-767-3p, miR-1914, miR-3074, Down (18) miR-1303, miR-525-5p, miR-3184, miR-3065-5p, miR-551b*, miR-3183, miR-1972, miR-500, miR-1273d, miR-103b, let-7b miR-130a, miR-196a, miR-425, miR-29b, miR-532-5p, miR-1260b, miR-191, miR-187, Up (19) miR-708, miR-342-5p, miR-590-5p, miR-451, miR-489, miR-130b, miR-1260, miR-223, miR-342-3p, miR-150, miR-192 P miR-4305, miR-619, miR-126*, miR-27a, miR-126, miR-20a, let-7e, miR-18a, miR-19b, 2 Down (29) miR-30a, miR-324-5p, miR-21, miR-218, miR-30d, miR-320a, miR-181a, miR-100, miR-146a, miR-10a, miR-93, miR-23a, miR-26a, miR-301a, miR-99a, miR-34a, miR-92a, let-7a, miR-17, miR-23b P 3 Up (15) Down (4) miR-130b, miR-342-3p, miR-126, miR-99b, miR-590-5p, miR-200c, miR-99a, miR-1260, miR-145, miR-192, miR-140-3p, miR-24, miR-223, miR-150, miR-451 miR-483-5p, miR-454, miR-675, miR-103b 1 P 4 miR-25, miR-22, miR-451, miR-141, miR-200c, miR-193a-5p, miR-574-5p, miR-205, Up (13) miR-146b-5p, miR-146a, miR-339-5p, let-7i, miR-210 Down (13) let-7d, miR-26b, miR-135b, miR-26a, let-7a, miR-361-5p, let-7f, miR-148a, miR-214, miR-15b, miR-29b, miR-29c, miR-150 P Up (5) miR-22, let-7f, miR-1308, miR-15b, miR-124 5 Down (3) miR-324-5p, miR-135a, let-7b P Up (6) miR-145, miR-375, miR-146a, miR-124, miR-146b-5p, miR-200b 6 Down (3) miR-1308, miR-30a, miR-451 P Up (4) miR-182, miR-103, miR-93, miR-17 7 Down (8) miR-10b, let-7i, miR-21, miR-22, miR-150, miR-451, miR-125b, miR-99a 10 11 Table S3. Aberrantly expressed miRNAs in breast tissues based on mixed data of 7 paired 12 tumor and adjacent normal tissue samples. 13 Different method Aberrantly expressed miRNAs miR-221, miR-19b, miR-451, miR-126, miR-140-3p, let-7i, miR-223, miR-342-5p, Total Up (17) miR-1308, miR-191, miR-130a, miR-130b, miR-210, miR-342-3p, miR-708, miR-192, miR-1260 (counts) Down (8) miR-361-5p, miR-26b, miR-135b, miR-26a, miR-214, miR-15b, miR-29c, miR-155 Total Up (5) miR-130b, miR-223, miR-210, miR-342-3p, miR-192 (percent) Down (4) miR-1287, miR-188-5p, miR-103b, miR-126* 14 The final expression data are mixed based on original sequence counts (counts) and relative expression levels 15 (percent), respectively. Due to involved in variety of total sequence counts between different samples, the final 16 17 expression data based on relative expression levels are more reasonable than other method. 18 Table S4. Functional enrichment pathway analysis of experimentally validated target genes 19 of aberrantly expressed miRNAs in Table 2. 20 Count Enrichment (no.) P-value Chronic myeloid leukemia 9 1.79E-16 MAPK signaling pathway 9 2.61E-11 Bladder cancer 8 1.80E-16 8 8.56E-14 Prostate cancer 8 9.40E-14 Pancreatic cancer 8 1.99E-14 Colorectal cancer 7 6.76E-12 Pathway TGF-beta signaling pathway Target Genes ACVR1C;CDKN1A;E2F1;E2F3;KRAS;MYC;NRAS; SMAD4;TGFBR2 ACVR1C;BDNF;KRAS;MAPK9;MYC;NRAS;PTPN7; STMN1;TGFBR2 CDKN1A;E2F1;E2F3;KRAS;MYC;NRAS;THBS1; VEGFA ACVR1C;BMP7;BMPR2;MYC;RBL2;SMAD4; TGFBR2;THBS1 BCL2;CDK2;CDKN1A;E2F1;E2F3;KRAS;NRAS;PTEN ACVR1C;E2F1;E2F3;KRAS;MAPK9;SMAD4; TGFBR2;VEGFA ACVR1C;BCL2;KRAS;MAPK9;MYC;SMAD4;TGFBR2 2 Cell cycle 7 8.11E-11 CCND2;CDK2;CDKN1A;E2F1;E2F3;RBL2;SMAD4 Focal adhesion 7 3.66E-09 BCL2;CCND2;PAK3;MAPK9;PTEN;THBS1;VEGFA Glioma 6 1.25E-10 CDKN1A;E2F1;E2F3;KRAS;NRAS;PTEN Melanoma 6 2.15E-10 CDKN1A;E2F1;E2F3;KRAS;NRAS;PTEN Small cell lung cancer 6 6.97E-10 BCL2;CDK2;E2F1;E2F3;MYC;PTEN ErbB signaling pathway 6 7.48E-10 CDKN1A;PAK3;KRAS;MAPK9;MYC;NRAS p53 signaling pathway 5 1.65E-08 CCND2;CDK2;CDKN1A;PTEN;THBS1 5 1.23E-05 BMP7;BMPR2;IL6;TGFBR2;VEGFA Thyroid cancer 4 3.43E-08 KRAS;MYC;NRAS;PPARG Endometrial cancer 4 3.84E-07 KRAS;MYC;NRAS;PTEN Non-small cell lung cancer 4 4.48E-07 E2F1;E2F3;KRAS;NRAS Acute myeloid leukemia 4 6.42E-07 KRAS;MYC;NRAS;PIM1 Renal cell carcinoma 4 1.36E-06 PAK3;KRAS;NRAS;VEGFA 4 7.52E-06 PAK3;KRAS;MAPK9;NRAS Axon guidance 4 1.51E-05 PAK3;GNAI2;KRAS;NRAS Tight junction 4 1.80E-05 GNAI2;KRAS;NRAS;PTEN Wnt signaling pathway 4 2.79E-05 CCND2;MAPK9;MYC;SMAD4 4 3.01E-05 CCND2;IL6;MYC;PIM1 Cytokine-cytokine receptor interaction T cell receptor signaling pathway Jak-STAT signaling pathway 21 22 Here, we only listed important pathways that are involved in at least 4 target mRNAs. These mRNAs are regulated 23 24 by at least 2 aberrantly expressed miRNAs in breast cancers. 25 Table S5. Functional enrichment pathway analysis of target genes of aberrantly expressed 26 let-7 and miR-30 gene families, and miR-30b gene cluster. 27 Count Enrichment (no.) P-value p53 signaling pathway 5 2.81E-07 CDK6;SERPINE1;THBS1;TNFRSF10B;TP53 Melanoma 5 3.25E-07 CDK6;E2F1;MET;RB1;TP53 Small cell lung cancer 5 8.49E-07 CDK6;E2F1;ITGA2;RB1;TP53 Axon guidance 5 6.52E-06 CXCL12;GNAI2;MET;PPP3CA;PPP3R1 Wnt signaling pathway 5 1.39E-05 JUN;PPP3CA;PPP3R1;TP53;WNT5A MAPK signaling pathway 5 2.30E-04 JUN;PPP3CA;PPP3R1;STMN1;TP53 Bladder cancer 4 1.54E-06 E2F1;RB1;THBS1;TP53 Non-small cell lung cancer 4 4.27E-06 CDK6;E2F1;RB1;TP53 Glioma 4 8.99E-06 CDK6;E2F1;RB1;TP53 Pancreatic cancer 4 1.43E-05 CDK6;E2F1;RB1;TP53 Chronic myeloid leukemia 4 1.59E-05 CDK6;E2F1;RB1;TP53 Apoptosis 4 3.13E-05 PPP3CA;PPP3R1;TNFRSF10B;TP53 Pathway Target Genes 3 Cell cycle 4 9.72E-05 CDK6;E2F1;RB1;TP53 Focal adhesion 4 7.68E-04 ITGA2;JUN;MET;THBS1 4 2.00E-03 CXCL12;IL6R;MET;TNFRSF10B Cytokine-cytokine receptor interaction 28 29 30 31 Here, we only list important pathways that involve at least 4 target mRNAs. Table S6. Several aberrantly expressed miRNAs in breast cancer according to published papers. 32 miRNA Deregulation Validated method References miR-145 down microarray and Northern blot [13] miR-125b down microarray and Northern blot [13] miR-21 up microarray and Northern blot [13] miR-10b up Real-time PCR [14] miR-9 up Real-time PCR [14] miR-31 down Real-time PCR [15] miR-221 up Real-time PCR [16] miR-222 up Real-time PCR [16] miR-181 up Real-time PCR [16] miR-342 down Real-time PCR [16] miR-489 down Real-time PCR [16] miR-200c down Real-time PCR [17] miR-27a up Real-time PCR [18] miR-206 down Real-time PCR [19] miR-146 down Real-time PCR [20] 33 34 4