American Association for Cancer Research
10780432ccr130623-sup-supp_figs.pdf (440.31 kB)

Supplementary Figures from Lactate Dehydrogenase B: A Metabolic Marker of Response to Neoadjuvant Chemotherapy in Breast Cancer

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posted on 2023-03-31, 17:50 authored by Jennifer B. Dennison, Jennifer R. Molina, Shreya Mitra, Ana M. González-Angulo, Justin M. Balko, María G. Kuba, Melinda E. Sanders, Joseph A. Pinto, Henry L. Gómez, Carlos L. Arteaga, Robert E. Brown, Gordon B. Mills

Supplementary Figures - PDF file 440K, Figure S1. Figure S1. Validation the IHC protocol for LDHB using FFPE MDAMB231 cells with stable knockdown of LDHA or LDHB. Reduced staining for LDHB was detected only in the LDHB knockdown line. Control cells were infected with a non-silencing shRNA. Figure S2. LDHB, when present, substantially contributed to the total LDH activity in cell lines. Figure S3. A, verification of LDHA or LDHB knockdown by LDH activity in stable isogenic cell lines, MDAMB231 and HCC1937. Figure S4. LDHB association with PAM50 intrinsic subtype in primary breast cancers. A, LDHB mRNA expression separated by intrinsic subtype: Perou GSE10893 (8) Figure S5. High LDHB was associated with triple-negative breast cancer. LDHB mRNA expression of HER2 (by IHC/FISH)-negative disease separated by clinical classification Figure S6. LDHB mRNA expression within PAM50 intrinsic subtypes for HR-positive/HER2-negative breast cancers. Figure S7. LDHB mRNA expression within PAM50 intrinsic subtypes for triple-negative breast cancers Figure S8. LDHB mRNA expression was highly associated with cell cycle proliferation marker, CCNB1, for basal-like cancers within the triple-negative group. Figure S9. Association between mRNA expression and copy number for LDHB for the breast invasive carcinoma cohort separated by (A) basal and (B) luminal A/B subtypes for TCGA "manuscript samples" within the cBio Cancer Genomics Portal



Purpose: Although breast cancers are known to be molecularly heterogeneous, their metabolic phenotype is less well-understood and may predict response to chemotherapy. This study aimed to evaluate metabolic genes as individual predictive biomarkers in breast cancer.Experimental Design: mRNA microarray data from breast cancer cell lines were used to identify bimodal genes—those with highest potential for robust high/low classification in clinical assays. Metabolic function was evaluated in vitro for the highest scoring metabolic gene, lactate dehydrogenase B (LDHB). Its expression was associated with neoadjuvant chemotherapy response and relapse within clinical and PAM50-derived subtypes.Results: LDHB was highly expressed in cell lines with glycolytic, basal-like phenotypes. Stable knockdown of LDHB in cell lines reduced glycolytic dependence, linking LDHB expression directly to metabolic function. Using patient datasets, LDHB was highly expressed in basal-like cancers and could predict basal-like subtype within clinical groups [OR = 21 for hormone receptor (HR)-positive/HER2-negative; OR = 10 for triple-negative]. Furthermore, high LDHB predicted pathologic complete response (pCR) to neoadjuvant chemotherapy for both HR-positive/HER2-negative (OR = 4.1, P < 0.001) and triple-negative (OR = 3.0, P = 0.003) cancers. For triple-negative tumors without pCR, high LDHB posttreatment also identified proliferative tumors with increased risk of recurrence (HR = 2.2, P = 0.006).Conclusions: Expression of LDHB predicted response to neoadjuvant chemotherapy within clinical subtypes independently of standard prognostic markers and PAM50 subtyping. These observations support prospective clinical evaluation of LDHB as a predictive marker of response for patients with breast cancer receiving neoadjuvant chemotherapy. Clin Cancer Res; 19(13); 3703–13. ©2013 AACR.

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