ABC trial (A011502): A randomized phase III double-blinded placebo controlled trial of aspirin as adjuvant therapy breast cancer

TPS599

Background: In-vitro and in-vivo evidence suggest that aspirin may have an anti-tumor effect. Multiple epidemiologic studies have reported improved breast cancer survival among regular aspirin users compared to non-users. Pooled data from randomized trials of aspirin for cardiovascular disease have also reported a decreased risk of metastatic cancer among aspirin users. However, the exact benefits and risks for breast cancer survivors need to be confirmed in a randomized controlled trial. Even if the clinical effect were modest, the global impact would be substantial since aspirin is inexpensive and widely available. Methods: The primary objective is to compare the effect of 300 mg daily aspirin versus placebo upon invasive disease-free survival (iDFS) in high risk HER2 negative breast cancer patients. Secondary objectives include effects on overall survival, cardiovascular disease, toxicity, and adherence. A biospecimen repository will be created for correlative analyses including tumor collection at baseline and blood and urine samples and questionnaires assessing lifestyle factors associated with inflammation (pain, sleep, stress, and depression) at baseline and 2 years. Study design: Subjects will be randomized (1:1) to aspirin 300 mg vs placebo daily for 5 years in a double-blinded fashion. Stratification factors include hormone receptor (HR) status (positive vs negative), body mass index ( < or ≥ 30 kg/m2), and stage (II vs III). Subjects will be followed every 6 six months while on study drug, then annually for 10 years. Accrual goal is 2936 patients to reach 381 iDFS events. We have 80% power to detect HR 0.75 assuming 5-year iDFS on placebo of 77%. Eligibility: Eligible subjects include patients aged 18-70 diagnosed with a primary invasive HER2 negative breast cancer. If HR positive, tumors need to be node positive and diagnosed within the past 10 years. If HR negative, tumors can be node positive or T2-4N0 within 18 months of diagnosis. Subjects who are currently anticoagulated or those with a prior history of GI bleeding, atrial fibrillation, or myocardial infarction are excluded. Subjects who regularly use aspirin (defined as ≥ 5 days per week) need to stop 30 days prior to enrollment. Updated accrual numbers will be given at the time of presentation. Clinical trial information: NCT02927249.

Prediction of treatment (tx)-induced fatigue in breast cancer (BC) patients (pts) using machine learning on genome-wide association (GWAS) data in the prospective CANTO cohort

11515

Background: Many BC survivors report fatigue. The relevant genomic correlates of fatigue after BC are not well understood. We applied a previously validated machine learning methodology (Oh 2017) to GWAS data to identify biological correlates of fatigue induced after tx. Methods: We analyzed 3825 BC pts with GWAS data (Illumina InfiniumExome24 v 1.1) from the CANTO study (NCT01993498). The outcome of this study was post-tx fatigue 1 year after the end of primary chemotherapy/radiotherapy/surgery using the EORTC C30 fatigue subscale (overall fatigue) and the EORTC FA 12 fatigue domains (physical/emotional/cognitive). For each domain, we limited the study group to those with zero baseline fatigue and defined severe fatigue change as score increase above the third quartile. We tested univariate correlations between severe fatigue in each domain and 496539 SNPs as well as relevant clinical variables. The machine learning prediction model based on preconditioning random forest regression (PRFR) (Oh et al., 2017), was then built using the SNPs with ancestry adjusted univariate p-value < 0.001 and clinical variables with Bonferroni adjusted p-value < 0.05. The model was validated in a holdout subset of the cohort. Gene set enrichment analysis (GSEA) was performed using MetaCore to identify key biological correlates relevant to tx-induced fatigue. Results: Distinct results were found by fatigue domain (table). GSEA showed that the cognitive fatigue model SNPs included biomarkers for cognitive disorders (p = 1.6 x 10-12) and glutamatergic synaptic transmission (p = 1.6 x 10-8). Conclusions: A SNP based model had differential performance by fatigue domain, with a potential genetic role on risk and biology for tx induced cognitive fatigue. Further research to explore biomarkers of tx induced fatigue are needed. [Table: see text]

Clinical significance of circulating tumor cells (CTCs) in hormone receptor-positive (HR+) metastatic breast cancer (MBC) patients (pts) receiving letrozole (Let) or Let plus bevacizumab (Bev): CALGB 40503 (Alliance)

1049

Background: CALGB 40503 randomized HR+ MBC postmenopausal pts to Let alone or Let+Bev as first-line therapy. Adding Bev to Let prolonged progression-free survival (PFS) but not overall survival (OS) (Dickler JCO 2016). We performed a correlative study to assess prognostic and predictive value of CTCs in this population. Methods: Blood was collected prior to initiation of treatment. CTCs were enumerated using US FDA-cleared CellSearch assay; samples with ≥5 CTCs per 7.5 mLs of blood were considered CTC-positive (CTC+). Correlation of CTCs with PFS and OS was assessed using Cox regression analysis. Median follow-up was 39 months (mo). Results: Of 343 pts treated, 294 had CTC data and were included in this analysis. Original study results that showed improved PFS (HR = 0.75; 95% CI: 0.59-0.96) but not OS (HR = 0.87; 95% CI: 0.65-1.18) in pts receiving Let+Bev compared to Let were recapitulated in this subset. In multivariable analysis, CTC+ pts (31%) had significantly reduced PFS (HR = 1.49; 95% CI: 1.12-1.97) and OS (HR = 2.08; 95% CI: 1.49-2.93) compared to CTC- pts. Moreover, CTC+ pts who did not receive Bev had worse PFS (HR = 2.31; 95% CI: 1.54-3.47) and OS (HR = 2.64; 95% CI: 1.59-4.40) (Table). CTC+ pts who received Bev had numerically longer median PFS (18.0 vs. 7.0 mo) and OS (33.6 vs. 27.1 mo) compared to CTC+ pts with no Bev; however, tests for interaction between CTC status and Bev (yes vs. no) were not statistically significant for PFS (p=0.70) or OS (p=0.84). Conclusions: CTCs were highly prognostic in this study involving addition of Bev to first-line Let in postmenopausal HR+ MBC. Further research to determine the potential predictive value of CTCs in the setting of both metastatic disease and early breast cancer is warranted. Support: U10CA180821, U10CA180882; Genentech; https://acknowledgments.alliancefound.org ; NCT00601900. Survival in HR+ MBC pts receiving Let or Let+Bev stratified by CTC status. Clinical trial information: NCT00601900. [Table: see text]

Genomic-based predictive biomarkers to anti-HER2 therapies: A combined analysis of CALGB 40601 (Alliance) and PAMELA clinical trials

571

Background: In HER2-positive breast cancer, new biomarkers of response are needed in order to direct multi-agent anti-HER2 combinations towards patients in whom they are truly needed. CALGB 40601 and PAMELA trials tested neoadjuvant dual HER2 blockade and included gene expression analysis aimed to evaluate different genomic biomarkers of trastuzumab and/or lapatinib benefit. Methods: Gene expression by mRNA sequencing (RNAseq) was performed on 265 and 142 pre-treatment tumors of the CALGB 40601 and the PAMELA clinical trials respectively. Intrinsic subtypes were determined by nCounter PAM50-predictor on the PAMELA samples. A new HER2-positive specific gene-centering method was trained on the PAMELA RNAseq data, and showed a higher concordance with PAM50 predictions obtained from nCounter platform. This method was then applied to CALGB 40601 samples. Results: In the combined cohort, the subtype distribution was 10% Luminal A, 8% Luminal B, 62% HER2-enriched (HER2-E), 10% Basal and 10% Normal-like. The pCR rate was significantly higher in HER2-E vs. not HER2-E subtypes (48.6% vs. 20.7%; P < 0.001). HER2-E subtype correlation, ERBB2 amplicon and B-cell genomic signatures were associated with pCR, while luminal signatures were associated with non-responders. In multivariate analysis HER2-E subtype, ERBB2 mRNA and IgG signature expression were independent predictors of response to paclitaxel + trastuzumab +/-lapatinib (OR = 1.98, OR = 1.51, OR = 1.48, respectively, P <0.05). The event free survival analysis at 5 years in the CALGB 40601 cohort showed a benefit of dual vs single anti-HER2-blockade (HR 0.35, P <0.05). Within the HER2-E, ERBB2-high and IgG–high subpopulations, there were also a benefit of dual vs. single anti-HER2 treatment (HR = 0.32, HR = 0.15, HR =0.15, respectively, P <0.05). Conclusions: Intrinsic subtype, ERBB2 mRNA levels, and IgG genomic signature are independent predictive biomarkers of response in the combined cohort. The clinical implementation of these biomarkers could help to design future escalation/de-escalation clinical trials in the HER2-positive neoadjuvant setting. Support: U10CA180821, U10CA180882, U24CA196171, P50-CA58223, GSK, SPORE, BCRF and SEOM. https://acknowledgments.alliancefound.org .

Impact of cancer on physical and mental activities of daily living in young adult (YA) survivors

11517

Background: Young Adult (YA) survivors face challenges unique from those survivors of childhood cancer or of middle and older age adults. The potential impact of cancer, its treatment or the lasting effects on daily mental and physical tasks are not fully understood. Methods: Eligibility included diagnosis of malignancy between ages 18-39, 1-5 years from diagnosis and ≥1 year from therapy completion. Participants were randomly selected from tumor registries of 7 academic institutions. Enrolled participants were asked to complete an online patient reported outcomes (PRO) survey related to the effects of cancer and its treatment on daily functionality, finances, and cancer-related distress. All enrolled subjects had diagnostic and treatment information abstracted by a standardized protocol and entered into a database. Results: Enrollment and the online PRO survey was completed by 872 survivors (43.5% of eligible survivors). Survivors were 72.3% female, 90% non-Hispanic or Latino and the most common cancer for males and females were testicular and breast cancer respectively. Cancer, its treatment or the lasting effects limited the kind or amount of instrumental activities of daily living (IADLs) in 649 (76.3%) of survivors. Exposure to chemotherapy was associated with a 3.2-fold increased odds of interference with IADLs (CI 2.08-4.83, p < 0.01) after controlling for diagnosis, age, gender, radiation and surgery exposure. This impairment lasted longer than 1 year in 268 (41.3%) of survivors. Cancer, its treatment or the lasting effects interfered with their ability to perform any mental tasks as part of their IADLs in 454 (53.3%) of survivors. Exposure to chemotherapy was associated with a 2.8-fold increased odds of interference with mental impairment of IADLs (CI 1.94-3.96, p < 0.01) after controlling for diagnosis, age, gender, radiation and surgery exposure. Exposure to radiation was also associated with an increased odds of interference with mental impairment of daily activities (CI 1.05-1.91, p < 0.01) after controlling for diagnosis, age, gender, chemotherapy and surgery exposure. Conclusions: In YA cancer survivors, cancer, its treatment or the lasting effects of treatment commonly impact the daily physical and mental IADLs and many survivors report ongoing limitations > 1 year from therapy completion.

Impact of overweight, obesity, and post-treatment weight changes on occupational reintegration of breast cancer (BC) survivors

11562

Background: Overweight and obesity are strongly linked to poorer BC-specific outcomes, quality of life and financial burden in cancer care. Weight loss interventions have the potential to improve such outcomes. Fewer data exist on whether excess weight and post-diagnosis weight changes impact the ability of BC survivors to return to work (RTW). Methods: CANTO (NCT01993498) is a multicenter prospective longitudinal study of 12000 patients (pts) with stage I-III BC that characterizes long-term toxicities of BC treatment. Of 5801 pts enrolled from 2012-2014 (last data lock), we identified 1874 pts who were professionally active at BC diagnosis, ≥5 years (yrs) younger than minimum legal retirement age (62 yrs) and with updated work status 2 yrs after diagnosis. Logistic regression models evaluated the impact of body mass index (BMI) at diagnosis and of weight changes over 2 yrs after diagnosis on odds of non-RTW, adjusting for age, education, income, BC treatment and recreational physical activity (PA). Results: 37% pts were overweight or obese at diagnosis (BMI ≥25 kg/m2): 34% of them gained ≥5% and 16% lost ≥5% weight after diagnosis. Rates of non-RTW at 2 yrs were significantly higher in overweight or obese vs under or normal weight pts (27% vs 18%, p≤.001; adjusted odds ratio 1.37, 95% Confidence Interval [CI] 1.04-1.80, p = .017). Overweight and obese pts who did not RTW experienced higher increments in weight (mean [95% CI]: +3.6% [+2.3, +4.9] vs +1.5% [+0.8, +2.2]) and reported more modest changes in PA (mean [95% CI]: +1.0 [-1.4, +3.5] vs +2.1 [+0.8, +3.3] MET-h/week) vs those who did RTW. Weight changes independently impacted odds of non-RTW in overweight and obese pts (p for interaction weight change*BMI ≤.001): a 5% weight gain was associated with 17% increase in adjusted odds of non-RTW (95% CI 2-35%, p = .024), whereas a loss ≥5% with 60% reduced odds of non-RTW vs weight gain (95% CI 18-82%, p = .013). Conclusions: Excess weight and weight changes are significantly associated with occupational reintegration after BC in overweight and obese pts. Randomized studies testing dedicated weight control interventions should also measure outcomes of social rehabilitation in this large subset of survivors. Clinical trial information: NCT01993498.

Body weight changes in young breast cancer survivors and associated predictors

11574

Background: Weight gain after cancer diagnosis is common in cancer survivors and has been linked to increased treatment toxicity, poor quality of life, and increased risk of second cancers and overall mortality. Young breast cancer (BC) survivors may be especially susceptible to weight changes given the impact of treatments such as chemotherapy and hormonal therapy on menopausal status. Methods: We identified women with Stage 0-III breast cancer diagnosed at ≤40 years (y) between 2006-2016 from a multi-center prospective cohort study. Clinical data including self-reported pre-diagnosis and follow-up weights were obtained using baseline and follow-up patient surveys. Participants missing baseline weight, pregnant at diagnosis/within 1y of diagnosis or with BC recurrence within 1y were excluded; those pregnant or with BC recurrence between 1-3y from diagnosis were excluded from the 3y analysis. Menopausal status at baseline and treatment-related amenorrhea (TRA) in follow-up were defined by self-reported last menstrual period. Factors associated with weight gain (>5%) were evaluated using univariate two-sided Fisher's exact test. Results: At baseline, 1y and 3y post diagnosis, 956, 899 and 687 women were eligible for analysis respectively. Median age at diagnosis was 37y (17 - 40), 65% received endocrine therapy and 74% chemotherapy. Premenopausal status was verified in 94% at baseline. Mean BMI at baseline was 24.4 (SD 5.3) kg/m2; 20% (187/956) were overweight and 12% (116/956) obese. At 1y and 3y, mean BMI increased modestly to 24.7 (SD 5.6) and 24.9 (SD 5.2), respectively with weight gain (>5%) observed in 18% (164/899) and 13% (87/687) respectively. 37% (300/804) and 32% (196/615) of eligible premenopausal subjects experienced TRA at 1y and 3y, respectively. Receipt of chemotherapy, receipt of endocrine therapy and TRA were not associated with weight gain at any timepoint. Conclusions: In this large prospective cohort of young BC survivors, mean BMI increased only modestly over time. Self-reported weight gain was not associated with treatment and not exacerbated by TRA. Further analysis to understand the effects of physical activity and other predictors of weight gain in this population are ongoing.

Survival outcomes of premenopausal patients diagnosed with invasive lobular carcinoma

1093

Background: The survival outcomes of postmenopausal women with invasive lobular carcinoma (ILC) are similar to invasive ductal carcinoma (IDC) when treated with aromatase inhibitor, but inferior when treated with tamoxifen. We sought to investigate the survival outcomes of premenopausal ILC when compared to IDC using a population-based analysis. Methods: We used Surveillance, Epidemiology, and End Results data (SEER) between 1990 to 2015 to identify premenopausal patients (defined as < 50 years old), diagnosed with stage I to III IDC or ILC. Breast Cancer Specific Survival (BCSS) was assessed using log-rank test and piecewisecox models. Annual hazard of BCCS for hormone receptor positive (ER+) ILC and ER+ IDC were calculated from year 0 to 20 and defined as the proportion of patients with a BCSS event during a 1-year interval. Results: The study includes a total of 170,352 pts diagnosed with either IDC (n = 158,733) and ILC (n = 11,619). 71% of IDC and 95% of ILC pts were ER+. Median age was 44 years old and median follow up was 90 months(IQR 40-151 months). Survival analysis revealed a significant time-dependent effect of histology for BCSS (p < .0001). When compared to IDC, ILC pts had better BCSS in the first 10 years after diagnosis (HR 0.73, 95% CI 0.68-0.78), but worse BCSS outcome after year 10 (HR 1.80, 95% CI 1.59- 2.03). Similar results were observed when adjusting for ER status, histologic grade and stage on multivariate analysis. Among pts ≤ 35 years old(n = 371 ILC; 18086 IDC) survival analysis revealed a non-significant trend towards inferior outcome for ILC compared to IDC throughout the whole follow-up period (HR = 1.2 95% CI 0.96-1.52). Annual hazard of BCCS events showed a peak at year 5 for both IDC and ILC. In the subset of IDC, we noticed a decreasing hazard of BCSS from years 6 through 20. By contrast, in the subset of ILC, we observed higher frequencies of BCSS from years 6-20 when compared to IDC (p < 0.0001). Conclusions: In this population-based analysis, premenopausal ILC had worse BCSS estimates when compared to premenopausal IDC. This is explained by a higher incidence of late events in the subset of ILC when compared to IDC.

Avoiding peg-filgrastim (Peg-F) prophylaxis during the paclitaxel (T) portion of the dose-dense (DD) doxorubicin-cyclophosphamide (AC)-T regimen: A prospective study

517

Background: Use of growth factors (GF) adds considerable expense and some toxicity to adjuvant breast cancer chemotherapy. We tested the feasibility and safety of omitting routine GF use during the T portion of DD AC-T. Methods: This is a prospective, single-arm study in which patients (pts) who completed 4 cycles of DD-AC proceeded to DD-T 175 mg/m2 every two weeks (wks) without routine GF (NCT02698891). Key inclusion: age≤ 65, ECOG PS≤1, absolute neutrophil count (ANC) ≥1500/mm3, and no febrile neutropenia (FN) during DD-AC. Criteria to treat for T included ANC ≥1000/mm3. Peg-F was given only if pts had FN in a prior cycle, or at investigator discretion if infection or treatment delay > 1 wk. Once Peg-F was given, pts received it in all future cycles. The primary endpoint was the rate of T completion ≤ 7 wks from cycle 1 day 1 (C1D1) to C4D1. Secondary endpoints included total use of Peg-F, rates of hematologic toxicity and FN, reasons for dose modification or hold. If ≥85% of pts completed T on time, the regimen would be considered feasible. If the true on-time completion rate is 75%, the chance the regimen would be declared infeasible is 91%, and if it is 85% the chance that the regimen is falsely declared infeasible is 10% (power = 0.899). ≥100/125 pts had to complete T on time for the regimen to be deemed successful. Results: Among 127 pts enrolled, 125 received ≥1 dose of protocol therapy and are included in the analysis. Median age at registration was 46 (range 21-65). Median C1D1 ANC was 7500/mm3 (range 1500-20500). 112 (90%) (95% CI 83-94%) pts completed DD-T ≤ 7 wks, and 3 (2%) completed within > 7 wks (2 due to neutropenia); 10 (8%) did not complete all cycles of T. Omission of Peg-F was not causally related to non-completion of T in any pts. The most common reasons for dose reduction or delays were non-hematologic. One pt had FN but was able to complete T on time. Eight (6.4%) pts received Peg-F during the trial. Conclusions: Omission of routine GF use during DD-T according to a pre-specified algorithm appears safe, feasible, and was associated with a 95.7% reduction in use of Peg-F, relative to the current standard of care. Additional analyses including cost implications are ongoing. Clinical trial information: NCT02698891.

Differential impact of endocrine therapy (ET) and chemotherapy (CT) on quality of life (QoL) of 4,262 breast cancer (BC) survivors: A prospective patient-reported outcomes (PRO) analysis

512

Background: We recently witnessed a trend to de-escalate CT and escalate ET in adjuvant BC treatment (tx). However, there has been limited prior research investigating the differential impact on QoL of tx classes. We aimed to test the impact of CT and ET on QoL PROs 2 yrs after diagnosis (dx). Methods: CANTO (NCT01993498) is a multicenter prospective longitudinal study of stage I-III BC pts that characterizes long-term toxicities of BC tx. For this analysis we included 4262 pts recruited from 2012-14. QoL was extensively evaluated using the EORTC QLQ C30 and BR23. Linear regression modeling was performed, adjusting for demographic and clinical factors, with use of CT and/or ET as independent variables. Analyses were stratified by menopausal status due to different tx patterns and sequelae of CT. Results: Median age at dx was 56 yrs, 63% of pts were post (PostM) and 37% premenopausal (PreM), 80% had Charlson score 0, 91% stage I-II. 26% received mastectomy, 52% CT (preM 68%, postM 44%; 86% anthracycline+taxane) and 82% ET (preM 89% tamoxifen; postM 88% aromatase inhibitor). 32% preM pts had menses 1 year after ET initiation. Overall, QoL deteriorates 2 yrs after dx. ET negatively impacts more QoL domains than CT at 2 yrs. Also, young age, smoking, income, aggressive local tx and physiological distress are often associated with low QoL. In the stratified analyses, in postM pts, mostly ET (not CT) is associated with deteriorated QoL. In contrast, in preM pts, mostly CT (not ET) is associated with deteriorated QoL. Table shows eg of associations. Conclusions: In a large prospective cohort of BC survivors, detrimental QoL 2 yrs after dx is mostly associated with ET; however, negative effects of CT persist on preM. This differential effect on QOL should be considered when choosing optimal adjuvant therapy and appropriate selection of pts for ET escalation should be a research priority. [Table: see text]

Impact of dental insurance coverage on presentation, long-term outcomes, and symptom burden in locally advanced head and neck cancer

e18230

Background: Medical insurance coverage is known to correlate with improved long-term (LT) outcomes in head and neck cancers (HNC) patients. However, associations with dental insurance coverage (DI) are not established. Methods: In 2012, we sent surveys to determine DI and LT symptom (Sx) burden (EORTC QLQ-30, National Health and Nutrition Examination Survey Oral Health, and Vanderbilt Head and Neck Sx Survey) to patients who had completed definitive chemoradiotherapy (sequential or concurrent) for locally advanced (LA) HNC at the Dana-Farber Cancer Institute from 2002-2011 (2013 ASCO annual meeting, abstract 9530). In 2019, we retrospectively collected demographic and clinical information from patient charts and publicly available records and correlated these data with 2012 survey data. We used Fisher’s exact tests for association of categorical variables and Student’s t-tests for continuous variables. We used univariate and multivariate Cox proportional hazard modeling for hazard ratios (HRs). Results: Of the 103 survey responders, 84% were male. Most had oropharyngeal (90, 88%) or unknown primary (9, 9%) and 52 (50%) tested positive for human papilloma virus-associated disease (40% not tested). 71 (69%) had DI, while 100 (98%) had medical health insurance. Subjects with DI were diagnosed (Dxed) at a younger age (53 vs. 59, p < 0.01). Stage at Dx did not vary by DI status (p = 0.27). At median follow-up of 10.4 years from Dx (range 2.0 -16.6), recurrence was not associated with DI status (6 (8%) for DI vs. 4 (13%) for no DI, p = 0.27, HR 0.55, 95% CI 0.15-1.93, p = 0.35). We identified 9 subjects (9%) who had died of any cause. Subjects with DI experienced lower mortality from all causes than those without (3% vs. 19%, p = 0.01) and longer median overall survival (OS) (range 4.3 - 16.6 years, HR 0.19, 95% CI 0.05-0.76, p = 0.02) on univariate analysis. The longer OS was not significant when controlling for age and stage at Dx (p = 0.12). DI was also associated with less frequent need for liquid supplements to maintain weight (p = 0.01). Conclusions: In our cohort, DI was associated with Dx at a younger age and longer OS, although future work should consider possible confounding factors such as differences in socioeconomic status. Our data highlight the need for further research to investigate the importance of DI in improving LT outcomes in HNC patients.

Genomics of HER2+ breast cancer in young women before and after exposure to chemotherapy (chemo) plus trastuzumab (H)

554

Background: HER2+ breast cancer (BC) is particularly common in young women. Genomic features of HER2+ tumors before and after H-based therapy have not been described in a population of young women and may point to clinically targetable mechanisms of resistance. Methods: From a large prospective cohort of women diagnosed with BC age ≤40 years, we identified those with HER2+ BC and tumor tissue available for sequencing before and after chemo+H. Whole exome sequencing (WES) was performed on each tumor and on germline DNA from blood. Tumor-normal pairs were analyzed for mutations and copy number (CN) changes. Evolutionary analysis was performed for patients with both pre- and post-treatment (tx) samples. Results: 22 women had successful WES samples from at least one timepoint; 13 of these had paired sequencing results both before and after chemo+H. For the majority of women, post-tx sample was following neoadjuvant chemo + H, though post-tx timepoint for other women represented locoregional or distant metastasis (Table). TP53 was the only gene that was significantly recurrently mutated in both pre- and post-tx samples. Comparison of matched pre-tx and post-tx samples demonstrated that large changes in HER2 CN over the course of tx were uncommon, only 2/13 pts had > 2-fold change in HER2 CN. Other clonal and subclonal genomic alterations were found to be acquired in the post-tx sample compared to the pre-tx sample. One patient acquired a putative activating mutation in ERBB2. Another patient acquired a clonal hotpsot mutation in TP53. MYC gene amplification was observed in 4 post-tx tumors. NOTCH2 alterations were found in post-tx biopsies from 2 different patients, and mutations in STIL were also found in post-tx biopsies from 2 patients, though the function of these mutations is not known. Conclusions: HER2+ breast tumors in young women display genomic evolution following tx with chemo+H. HER2 CN changes are uncommon, but we identified several genes that warrant exploration as potential mechanisms of resistance to therapy in this population.[Table: see text]

The international collaboration of active surveillance trials for low-risk DCIS (LORIS, LORD, COMET, LORETTA)

TPS603

Background: Retrospective data suggest breast cancer-specific survival rates with versus without surgery in patients with low-grade ductal carcinoma in situ (DCIS) are similar. Some DCIS patients have a low likelihood of progression to invasive cancer, but predicting who is at risk has not been established. Thus, treatment with a well-balanced risk / benefit ratio has not been achieved. Four active surveillance clinical trials for low risk DCIS have commenced in the United Kingdom (LORIS), Europe (LORD), United States (COMET), and Japan (LORETTA). We aim to examine the effectiveness & safety of active surveillance compared with surgical based treatment approaches for low-risk DCIS patients. Methods: Non surgical approaches are of the two types; active surveillance (AS) alone and AS + endocrine therapy (ET). In the randomized trials LORIS and LORD, the study arms are AS only, but while ET is an option in COMET, ET is mandatory in the single arm trial LORETTA. COMET and LORETTA have broader inclusion criteria as compared to LORIS and LORD. In COMET, comedo necrosis is eligible. In LORETTA, findings other than calcification on mammography (MMG) are also eligible (e.g. low echo area on breast ultrasound). Leaders of the four trials hold regular meetings to foster international DCIS trials collaboration to share information. LORIS Clinical trial information: ISRCTN27544579, LORD Clinical trial information: NCT02492607, COMET Clinical trial information: NCT02926911, LORETTA Clinical trial information: UMIN000028298 [JCOG1505]. Clinical trial information: UMIN000028298, NCT02492607, NCT02926911, ISRCTN27544579. [Table: see text]

Randomized phase II study of eribulin mesylate (E) with or without pembrolizumab (P) for hormone receptor-positive (HR+) metastatic breast cancer (MBC)

1004

Background: Studies of checkpoint inhibitor monotherapy show only modest activity in HR+ MBC. We report data from the first randomized study comparing E plus P versus E alone in HR+/HER2- MBC. Methods: Eligible patients (pts) had HR+/HER2- MBC, ≥2 lines of hormonal therapies and 0-2 lines of chemotherapy for MBC. Pts were randomized 1:1 to E 1.4mg/m2 intravenously (IV) on d1 and d8 with P 200 mg/m2 IV on d1 of a 21-day cycle (Arm A) or E alone (Arm B). At time of progression, pts in arm B could crossover and receive P alone. Primary endpoint was progression-free survival (PFS). Key secondary endpoints were: objective response rate (ORR) and overall survival (OS). Exploratory analyses assessed the association between PFS and PD-L1 status, tumor-infiltrating lymphocytes (TILs), neutrophil-lymphocyte ratio (NLR), tumor mutation burden (TMB), and genomic alterations by next generation sequencing on archival tissue. Results: 88 pts initiated protocol therapy; the median age was 58, median prior lines of chemotherapy 1, prior lines of hormonal therapy 2. Median follow-up was 6.3 months. Median PFS and ORR were not different between Arms A and B (PFS 4.1 vs 4.2 months p = 0.38; ORR 25% and 34% respectively (p = 0.49). 14 patients initiated crossover treatment with pembrolizumab; 1 patient experienced a PR (ORR 7%). All-cause AEs occurred in 100% of pts (G3-4, 54.6%) including 2 treatment related deaths on Arm A, both from known AEs attributed to both drugs. PD-L1 assay was performed in 65 pts: 24 (36.9%) had PD-L1 positive ( > 1% with 22C3, centrally tested) tumors. PD-L1 status, TILs, NLR, TMB, and genomic alterations were not associated with PFS (Table). Updated data, including OS and genomic results, will be presented. Conclusions: Among pts with HR+/HER2- MBC, the combination of E and P was not associated with longer PFS than E alone in the ITT or PD-L1+ population, though the PD-L1+ subgroup had very limited power to assess P benefit. Clinical trial information: NCT03051659. [Table: see text]

Diagnostic and treatment delays in young women with breast cancer

6575

Background: Delays in diagnosis (dx) and treatment (tx) affect breast cancer (BC) outcomes. We sought to identify factors associated with delays among young women, who do not undergo routine screening and often have pregnancy or breastfeeding-related breast changes that may mask a BC. Methods: The Young Women’s Breast Cancer Study is a multicenter, prospective cohort that enrolled 1302 women with newly dx BC age ≤40 between 2006-2016. Women reported the method and timing of cancer detection on the baseline survey. 231 were ineligible or excluded due to missing information. Among those reporting self-detected cancers, using multivariable regression we evaluated factors associated with delays ≥90 days (d) from symptom to presentation (self delay) and presentation to dx (care delay); in stage 0-III BC we evaluated delays ≥60d from dx to tx (tx delay). Results: 1071 eligible women had median age at dx of 37 yrs (17-40) and 74% reported self-detected cancers. Self delay or care delay ≥90d was reported in 17% and 13%, respectively. Factors inversely associated with self delay included pregnancy at dx (vs nulliparous, OR 0.10, CI 0.01-0.78) and perceived financial comfort (vs not, OR 0.62, CI 0.41-0.93). Women dx ≤1 year post-partum who breastfed (vs nulliparous, OR 2.60, CI 1.14-5.93) and those with a family history of breast/ovarian cancer (vs none, OR 1.79, CI 1.00-3.19) were more likely to have a care delay. Age was inversely associated with care delays (OR 0.94, CI 0.89-0.99). Tx delay was reported by 10% (105/1015), and associated with being single (vs partnered, OR 1.61, CI 1.02-2.56 ), non-white (vs white, OR 1.85, CI 1.09-3.13) and having Stage 0 BC (vs stage 1, OR: 3.08, CI 1.65-5.77); women with stage 3 BC (vs stage 1, OR 0.13, CI 0.03-0.56) were less likely to have a tx delay. Conclusions: In this cohort, most young women with BC underwent timely dx and tx initiation. Women dx ≤1 year post-partum who breastfed were more likely to experience a care delay, likely because lactational changes may mask BC signs and symptoms. The associations of perceived financial status with self delay and non-white race with tx delay underscore the need for additional support to ensure timely care for underserved populations with the goal of eliminating disparities in outcomes.

Cardiorespiratory fitness and cardiovascular mortality after prolonged androgen deprivation therapy for prostate cancer

11576

Background: Androgen deprivation therapy (ADT) plays a pivotal role in management of prostate cancer (PC), with prolonged ADT favored over short-term use in the definitive treatment of high risk PC with radiation. Objectives: To compare cardiorespiratory fitness (CRF) and cardiovascular (CV) mortality among patients with PC with and without ADT exposure, and to explore how duration of ADT exposure influences CRF and CV mortality risk. Methods: This is a retrospective study of patients referred for exercise treadmill testing (ETT) after a diagnosis of PC. PC risk classification was based on Gleason score (GS) at diagnosis: high risk GS ≥ 8, intermediate risk GS= 7, and low risk GS ≤ 6. CRF was categorized according to metabolic equivalents (METs): METs ≥ 8 defined as good CRF and METs < 8 as reduced CRF. ADT exposure was grouped as short-term (≤ 6 months) versus prolonged (> 6 months). Results: 616 patients underwent an ETT a median of 4.8 years (interquartile range: 2.0-7.9) after diagnosis of PC. 150 patients (24.3%) received ADT prior to ETT; 51 with short-term versus 99 with prolonged exposure. 524 (85.1%) patients had ≥ 2 CV risk factors, and 28 CV deaths occurred over 4.2 (interquartile range: 2.3-7.1) years following the ETT. Reduced CRF was more frequent among ADT-exposed versus ADT-naive patients (48.7 versus 32.6%, p< 0.001). Prolonged ADT was associated with reduced CRF (odds ratio (OR): 2.71; 95% confidence interval (CI): 1.31-5.61; p=0.007) and increased CV mortality (hazard ratio (HR): 3.87; 95% CI: 1.16-12.96; p=0.03) in adjusted analyses. In contrast, short-term ADT exposure was not independently associated with either reduced CRF (OR 1.71; 95% CI: 1.00-2.94); p=0.05) or CV mortality (HR: 1.60; 95% CI: 0.51-5.01; p=0.42). Conclusions: Among patients with PC and high baseline CV risk, > 6 months ADT exposure but not less was associated with reduced CRF and increased CV mortality. Reduced CRF may in part mediate increased CV mortality risk. Exercise interventions concurrent with prolonged ADT warrants investigation to potentially offset risk.

CALGB (Alliance) 40603: Long-term outcomes (LTOs) after neoadjuvant chemotherapy (NACT) +/- carboplatin (Cb) and bevacizumab (Bev) in triple-negative breast cancer (TNBC)

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Background: Both Cb and Bev demonstrate activity when combined with standard chemotherapy in TNBC. CALGB 40603 is a 2x2 randomized trial that previously demonstrated that adding Cb to NACT significantly increased pathologic complete responses in the breast/axilla (pCR), while adding Bev did not (Sikov, JCO 2015). Here we report 5-year LTOs and assess factors that influenced them. Methods: 443 patients with clinical stage II-III previously untreated TNBC received 12 weeks of paclitaxel (wP) +/- Cb then dose-dense AC, +/- Bev before surgery. The primary endpoint was pCR. Analyses of LTOs (event-free survival (EFS), distant recurrence-free interval (DRFI) and overall survival (OS)), impact of residual cancer burden and other variables were secondary. Results: Median follow-up was 5.7 years (y); 5y EFS was 70.9% (95% CI; 66.7%-75.4%), DRFI 76.3% (72.3%-80.5%) and OS 76.9% (72.9%-81.2%). Pretreatment clinical stage and achieving pCR correlated with LTOs, while age, race, subtype (basal-like vs. not) and tumor grade did not. Among pCR 5y EFS was 86.4% vs. 57.5% for non-pCR (HR 0.28, 0.19-0.43), OS was 88.7% vs 66.5% (HR = 0.28, 0.17-0.44). This relationship was similar in all trial arms. Any residual disease conferred poorer outcome; compared with pCR/Residual Cancer Burden (RCB) 0, EFS HRs were 2.29 (1.32-3.97), 3.01 (1.90-4.74), and 9.67 (5.66-16.51) for RCBI, II and III, respectively. There were no improvements in LTOs with Cb (EFS HR 0.99, 0.70-1.40) or Bev (EFS HR 0.91, 0.64-1.29). In an exploratory analysis, receipt of ≥11 doses of wP was associated with better EFS (HR 1.92, 1.33-2.77); this was particularly notable in Cb-treated arms. Conclusions: As expected, regardless of treatment arm pCR was associated with markedly better LTOs, and pts with any residual disease had significantly worse outcomes. The addition of Cb or Bev to standard NACT for TNBC did not improve LTOs in this trial, although it should be noted that the trial was not powered for this endpoint. Omission of chemotherapy doses may result in poorer outcomes, especially among Cb-treated pts, which may warrant further evaluation. Support: U10CA180821; U10CA180882; Genentech; https://acknowledgments.alliancefound.org ; NCT00861705 Clinical trial information: NCT00861705.

Local-regional recurrence in women with small node-negative, HER2-positive breast cancer: results from a prospective multi-institutional study (the APT trial)

PURPOSE

Women with HER2-positive breast cancer treated prior to effective anti-HER2 therapy have higher rates of local-regional recurrence (LRR) than those with HER2-negative disease. Effective systemic therapy, however, has been shown to decrease LRR. This study examines LRR in women with HER2-positive breast cancer treated on a single-arm prospective multicenter trial of adjuvant trastuzumab (H) and paclitaxel (T).

METHODS

Patients with HER2-positive tumors ≤ 3.0 cm with negative axillary nodes or micrometastatic disease were eligible. Systemic therapy included weekly T and H for 12 weeks followed by continuation of H to complete 1 year. Radiation therapy (RT) was required following breast-conserving surgery (BCS), but dose and fields were not specified. Disease-free survival (DFS) and LRR-free survival were calculated using the Kaplan-Meier method.

RESULTS

Of the 410 patients enrolled from September 2007 to September 2010, 406 initiated protocol therapy and formed the basis of this analysis. A total of 272 (67%) had hormone receptor-positive tumors. Of 162 patients undergoing mastectomy, local therapy records were unavailable for two. None of the 160 for whom records were available received RT. Among 244 BCS patients, detailed RT records were available for 217 (89%). With a median follow-up of 6.5 years, 7-year DFS was 93.3% (95% CI 90.4-96.2), and LRR-free survival was 98.6% (95% CI 97.4-99.8).

CONCLUSION

LRR in this select group of early-stage patients with HER2-positive disease receiving effective anti-HER2 therapy is extremely low. If confirmed in additional studies, future investigational efforts should focus on de-escalating local therapy.

Cancer Treatment-Related Infertility: A Critical Review of the Evidence

Cancer treatments may compromise the fertility of children, adolescents, and young adults, and treatment-related infertility represents an important survivorship issue that should be addressed at diagnosis and in follow-up to ensure optimal decision-making, including consideration of pursuing fertility preservation. Risk of infertility varies substantially with patient and treatment factors. The ability to accurately assess fertility risk for many patients is hampered by limitations of the current literature, including heterogeneity in patient populations, treatments, and outcome measures. In this article, we review and synthesize the available data to estimate fertility risks from modern cancer treatments for both children and adult cancer survivors to enable clinicians to counsel patients about future fertility.

Factors Affecting Surgical Decisions in Newly Diagnosed Young Women with Early-Stage Breast Cancer

Given that young women with breast cancer often have concerns and priorities attributable to their life stage, we conducted a series of interviews to better understanding the surgical decision-making experience among women diagnosed at age ≤40. Women spoke of how the potential effect of an extended recovery was affecting their decision and, in some cases, contributing to decisional conflict. Several women described their worry of leaving cancer cells behind; others cited the need for continued surveillance as a consideration. Attention to situational anxiety and concerns about recurrence are warranted to ensure that decisions are made in a supportive and patient-centered setting.

Seven-Year Follow-Up Analysis of Adjuvant Paclitaxel and Trastuzumab Trial for Node-Negative, Human Epidermal Growth Factor Receptor 2-Positive Breast Cancer

PURPOSE

The Adjuvant Paclitaxel and Trastuzumab trial was designed to address treatment of patients with small human epidermal growth factor receptor 2 (HER2)-positive breast cancer. The primary analysis of the Adjuvant Paclitaxel and Trastuzumab trial demonstrated a 3-year disease-free survival (DFS) of 98.7%. In this planned secondary analysis, we report longer-term outcomes and exploratory results to characterize the biology of small HER2-positive tumors and genetic factors that may predispose to paclitaxel-induced peripheral neuropathy (TIPN).

PATIENTS AND METHODS

In this phase II study, patients with HER2-positive breast cancer with tumors 3 cm or smaller and negative nodes received paclitaxel (80 mg/m²) with trastuzumab for 12 weeks, followed by trastuzumab for 9 months. The primary end point was DFS. Recurrence-free interval (RFI), breast cancer-specific survival, and overall survival (OS) were also analyzed. In an exploratory analysis, intrinsic subtyping by PAM50 (Prosigna) and calculation of the risk of recurrence score were performed on the nCounter analysis system on archival tissue. Genotyping was performed to investigate TIPN.

RESULTS

A total of 410 patients were enrolled from October 2007 to September 2010. After a median follow-up of 6.5 years, there were 23 DFS events. The 7-year DFS was 93% (95% CI, 90.4 to 96.2) with four (1.0%) distant recurrences, 7-year OS was 95% (95% CI, 92.4 to 97.7), and 7-year RFI was 97.5% (95% CI, 95.9 to 99.1). PAM50 analyses (n = 278) showed that most tumors were HER2-enriched (66%), followed by luminal B (14%), luminal A (13%), and basal-like (8%). Genotyping (n = 230) identified one single-nucleotide polymorphism, rs3012437, associated with an increased risk of TIPN in patients with grade 2 or greater TIPN (10.4%).

CONCLUSION

With longer follow-up, adjuvant paclitaxel and trastuzumab is associated with excellent long-term outcomes. Distribution of PAM50 intrinsic subtypes in small HER2-positive tumors is similar to that previously reported for larger tumors.

Developing a Novel Model to Improve Research and care for Cancer Survivors: a Feasibility Study

Despite a growing number of clinical trials and supportive care programs for cancer survivors, recruitment of patients for these opportunities during the survivorship phase of care is challenging. We piloted a novel process to systematically educate patients about available research studies and supportive care programs as part of a survivorship care visit. Between 3/2015 and 8/2015, patients seen in the Adult Survivorship Program who had not previously received a treatment summary and survivorship care plan (TS/SCP) were provided with one accompanied by a list of survivorship research studies and care programs tailored to their diagnosis. Survivorship providers discussed the opportunities and recorded whether the patient was interested in relevant studies and placed referrals to study staff. Following the visit, we tracked study enrollment and surveyed patients about their experience. Fifty of 56 (89%) pilot participants completed the survey. Almost all (98%) reported that the TS/SCP visit and document helped with knowledge of research opportunities and supportive care interventions. Following receipt of the TS/SCP, 44% were interested in at least one study and in further follow-up with research staff. Of the 30 survivors eligible for at least one study, 6 (20%) have enrolled in at least one study to date. This pilot program demonstrates that the systematic sharing of available clinical studies and supportive care programming as part of a survivorship care plan visit is feasible and well received by cancer survivors and may facilitate and enhance accrual to clinical trials in the survivorship phase of care.

Identifying distinct trajectories of change in young breast cancer survivors' sexual functioning

OBJECTIVES

To identify and characterize distinct trajectories of change in young women's sexual functioning over the first 5 years following breast cancer diagnosis.

METHODS

Group-based trajectory modeling was applied to the sexual functioning of 896 women diagnosed with stage I-IV breast cancer at age 40 or younger. The Cancer Rehabilitation Evaluation System was used to evaluate women's symptoms of sexual dysfunction annually for 5 years.

RESULTS

Five distinct trajectories of sexual functioning were identified: one asymptomatic, one minimally symptomatic, two moderately symptomatic, and one severely symptomatic trajectory. Twelve percent of women were asymptomatic throughout follow-up. The plurality of women experienced stable mild symptoms (42%). Among those with moderate symptoms, some experienced improvement over time (22%) while others experienced deterioration (13%); 11% experienced stable severe symptoms that did not remit over time. Independent predictors of experiencing a symptomatic rather than asymptomatic trajectory (P < 0.05, two-sided) included diagnosis with stage 2 versus 1 disease, ER positive disease treated with oophorectomy or ovarian suppression, being partnered, having anxiety, poorer body image, and greater musculoskeletal pain.

CONCLUSIONS

We identified distinct trajectories that describe the reported sexual symptoms in this cohort of young breast cancer survivors. The majority of women reported various degrees of sexual dysfunction that remained stable over the study period. There is, however, potential for improvement of moderate and severe symptoms of sexual dysfunction in early survivorship.

Fatigue and physical activity in cancer survivors: A cross-sectional population-based study

Purpose

A substantial proportion of cancer survivors experience fatigue after diagnosis. Physical activity (PA) can impact fatigue after cancer. In this study, we evaluated the prevalence and association of fatigue and the practice of PA in a population with early cancer.

Methods

Using the national population‐based French cross‐sectional study Vie après le cancer 2, we included 1984 patients with early breast (61.1%), prostate (21.5%), and colorectal (17.4%) cancer. Severe fatigue at 2 years postdiagnosis was defined by a score ≥40 in the European Organization for Research and Treatment of Cancer quality of life questionnaire (EORTC QLQ C30) fatigue subscale. PA was defined as (a) self‐reported PA before diagnosis (active/inactive) and (b) change in PA since diagnosis (increased/maintained exposure vs decreased exposure/remaining inactive). Multivariate regression examined associations of severe fatigue with PA, adjusting for baseline clinical and treatment variables.

Results

Median age was 52 years. 51.5% of patients experienced severe fatigue 2 years post‐diagnosis. 87.7% reported to be physically active before cancer diagnosis; 53.3% of patients either decreased PA or remained inactive at 2 years postdiagnosis. At 2 years postdiagnosis, severe fatigue was associated with a change in PA since diagnosis: patients with decreasing PA/remaining inactive from pre‐ to postdiagnosis had a higher risk of severe fatigue vs those with increasing/maintaining PA (adjusted odds ratio [95% confidence interval] 2.32 [1.85‐2.90]).

Conclusion

Fatigue continues to be a substantial problem for cancer survivors 2 years after cancer diagnosis and is associated with PA decreasing/remaining inactive since diagnosis. Interventions to maintain or increase PA for cancer survivors should be tested to mitigate long‐term fatigue after cancer.

Abstract GS6-05: The impact of breast cancer surgery on quality of life: Long term results from E5103

Background: Breast cancer (BC) treatment, including surgery, can impact not only short-term health outcomes but may also affect longer term health-related and psychosocial quality of life (QOL). We sought to describe the impact of BC surgery on QOL among breast cancer survivors followed in a large randomized trial.

Methods: The ECOG-ACRIN protocol E5103 was a phase III trial that randomized BC patients (pts) who had undergone definitive BC surgery to receive adjuvant doxorubicin, cyclophosphamide, and paclitaxel with either bevacizumab (bev) or placebo. Telephone based surveys were administered to all pts enrolled between 01/Jan/10 and 08/Jun/10 as part of a Decision-Making/QOL component until 18 mos post enrollment. Functional/psychosocial QOL domains were assessed by the EQ-5D-3L and the FACT B+G. Fisher's exact test compared categorical and Wilcoxon rank sum test compared continuous variables between subgroups. Multivariable regression was used to evaluate factors in addition to primary surgery at enrollment (age, race, ER/PgR status, tumor size, nodal status) associated with overall FACT score at 18 mos.

Results: Patient reported outcomes at 18 mos were available from 89.6% (465/519) pts. At enrollment, 57% (266/465) had a mastectomy; 43% (199/465) breast conserving surgery (BCS). Median age at enrollment was 52 (range: 25-76) years. There were no differences in QOL between bev vs placebo treatment arms (EQ-5D-3L Index Score p=0.65; FACT B+G Score p=0.23) at 18 mos so groups were combined. Using EQ-5D-3L, over half of the pts (58%) reported at least some pain/discomfort; 38% symptoms of anxiety/depression. A higher proportion of mastectomy pts reported problems with usual activities compared to BCS pts (Table). Compared to BCS pts, mastectomy pts had lower average EQ5D-3L scores 0.80 vs. 0.84, p=0.04 and FACT B+G scores 109 vs. 114, p=0.01, indicating worse QOL. In univariate analyses, non-white race (p=0.03), ER/PgR+ status (p=0.04) and mastectomy as primary surgery (p=0.01) were significantly associated with worse QOL (lower FACT B+G scores). In multivariable analyses, non-white race (p=0.02) and ER/PgR+ status (p=0.05) remained associated with worse QOL; mastectomy was borderline significant (p=0.06).

Conclusions: Among women participating in a contemporary adjuvant BC chemotherapy trial, a substantial proportion of survivors experience symptoms that may be amenable to intervention, including referral to physical rehabilitation, especially among pts undergoing more extensive surgery. Attention to psychosocial health is also essential both during and after completion of active treatment to optimize QOL outcomes.

 N(%) reporting problems*  5 DimensionsBCSMastectomyOverallp**Mobility44(23)59(23)103(23)1.00Self-care11(6)23(9)34(7)0.21Usual activities49(25)90(34)139(30)0.04Pain/discomfort104(53)161(61)265(58)0.08Anxiety/depression70(36)105(40)175(38)0.44*3L: 3 possible answers: 1) no problems 2) some/moderate problems 3) problems; responses then collapsed into no problems vs. any problems' (=some/moderate problems and problems). ** Fisher's exact test p-value.

Citation Format: Rosenberg SM, O'Neill A, Sepucha K, Miller KD, Dang CT, Northfelt DW, Sledge GW, Schneider BP, Partridge AH. The impact of breast cancer surgery on quality of life: Long term results from E5103 [abstract]. In: Proceedings of the 2018 San Antonio Breast Cancer Symposium; 2018 Dec 4-8; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2019;79(4 Suppl):Abstract nr GS6-05.