Definitive local therapy for T4 prostate cancer associated with improved local control and survival.

OBJECTIVES: To evaluate patients with clinical (c)T4 prostate cancer (PCa), which represent both a heterogenous and understudied population, who often present with locally advanced disease and obstructive symptoms causing significant morbidity and mortality. We analysed whether receiving definitive local therapy influenced symptomatic and oncological outcomes. METHODS: Retrospective analysis of 154 patients with cT4 PCa treated at a single institution in 1996-2020. Systemic therapy with or without local treatment (surgery, radiotherapy [RT], or both). Uni- and multivariate analyses of associations between clinicopathological features (including obstructive symptoms) and receipt of local therapy on overall survival (OS) and disease control were done with Cox regression. RESULTS: The median follow-up time was 5.9 years. Most patients had adenocarcinoma (88%), Gleason score 9-10 (77%), and median baseline prostate-specific antigen (PSA) of 20 ng/mL; most (54%) had metastatic cT4N0-1M1 disease; 24% regionally advanced cT4N1M0, and 22% localised cT4N0M0. Local therapies were RT (n = 44), surgery (n = 28), or both (n = nine). Local therapy was associated with improved OS (hazard ratio [HR] 0.3, P < 0.001), longer freedom from local recurrence (HR 0.39, P = 0.002), less local progression (HR 0.41, P = 0.02), fewer obstructive symptoms with progression (HR 0.31, P = 0.01), and less death from local disease (HR 0.25, P = 0.002). On multivariate, local therapy was associated with improved survival (HR 0.58, P = 0.02), and metastatic disease (HR 2.93, P < 0.001) or high-risk pathology (HR 2.05, P = 0.03) was associated with worse survival. CONCLUSION: Definitive local therapy for cT4 PCa was associated with improved symptomatic outcomes and survival even among men with metastatic disease. Pending prospective evaluation, these findings support definitive treatment with local therapy for cT4 disease in select cases.

Health-related quality of life in adolescents and young adults with cancer who received radiation therapy: a scoping review.

PURPOSE: Radiation therapy (RT) is a critical component of treatment for adolescents and young adults (AYAs, age 15-39 years old) diagnosed with cancer. Limited prior studies have focused on AYAs receiving RT despite the potentially burdensome effects of RT. We reviewed the literature to assess health-related quality of life (HRQOL) in AYAs with cancer who received RT. METHODS: The MEDLINE, EMBASE, and Web of Science databases were searched in January 2022 to identify studies that analyzed HRQOL measured by patient-reported outcomes in AYAs who received RT. After title (n = 286) and abstract (n = 58) screening and full-text review (n = 19), articles that met eligibility criteria were analyzed. RESULTS: Six studies were analyzed. Two studies included AYAs actively receiving treatment and all included patients in survivorship; time between diagnosis and HRQOL data collection ranged from 3 to > 20 years. Physical and mental health were commonly assessed (6/6 studies) with social health assessed in three studies. AYA-relevant HRQOL needs were rarely assessed: fertility (1/6 studies), financial hardship (1/6), body image (0/6), spirituality (0/6), and sexual health (0/6). No study compared HRQOL between patients actively receiving RT and those post-treatment. None of the studies collected HRQOL data longitudinally. CONCLUSION: HRQOL data in AYAs receiving RT is limited. Future studies examining longitudinal, clinician- vs. patient-reported, and AYA-relevant HRQOL are needed to better understand the unique needs in this population.

Comparing long-term sexual dysfunction across different uterine cancer treatment modalities.

INTRODUCTION: The objective of this study was to assess differences in long-term sexual and menopausal side effects after uterine cancer treatment among treatment modalities. METHODS AND MATERIALS: This is a cross-sectional study that examined women treated for uterine cancer from 2006-2018. Eligible women included those who underwent a hysterectomy/bilateral salpino-oophorectemy alone (HS), with brachytherapy (BT), or with external beam radiation therapy (EBRT). A noncancer cohort of women who underwent a hysterectomy/BSO for benign indications were also identified (non-CA). To compare outcomes, we utilized a shortened form of the female sexual function index (FSFI) and the menopause survey, which consists of 3 subscales: hot flashes, vaginal symptoms, and urinary symptoms. Demographic, comorbidity, and other treatment variables were collected. Survey totals were compared across cohorts using ANOVA tests and logistic regression. RESULTS: A total of 284 women completed the Menopause Survey (Non-CA 64, HS 60, BT 69, EBRT 91); 116 women reported sexual activity in the last 4 weeks and completed the FSFI (NC 32, HS 21, BT 31, EBRT 32). The mean FSFI score for the entire cohort was 11.4 (SD 4.16), which indicates poor sexual function. There was no significant difference between any cohort in the overall FSFI score (p = 0.708) or in any of the FSFI subscales (all p > 0.05). On univariate analysis, BT was associated with fewer menopausal hot flashes and vaginal symptoms compared to the non-CA cohort (p < 0.05), which did not persist on multivariable analysis. CONCLUSION: There was no significant difference in sexual dysfunction or menopausal symptoms in those treated for uterine cancer with or without adjuvant radiation. Most patients reported poor sexual function.

The Value of Patient-Reported Outcomes to Predict Symptom Burden and Health-Related Quality of Life After Chemoradiation for Cervical Cancer: A Prospective Study.

PURPOSE: Patients with cervical cancer undergoing chemoradiation have high symptom burden. We performed an analysis of prospectively collected data on patient-reported outcomes to determine characteristics predictive of poor treatment experience. METHODS AND MATERIALS: Between 2021 and 2023, we prospectively collected data on patient-reported outcomes from patients with cervical cancer undergoing definitive chemoradiation. The European Organization for Research and Treatment of Cancer (EORTC)-Quality of Life Question-Core 30 and the EORTC-Quality of Life Question-Cervical Cancer module were completed at baseline (BL) and at the end of treatment (EOT). Poor treatment experience was defined as EOT poor health-related quality of life (HRQOL), low physical function, or significant overall symptom burden. Predictive factors analyzed included demographic, clinical, and disease-specific factors and BL financial toxicity, depression, social function, and emotional function. Receiver operating characteristic analysis provided appropriate predictive cutoff values. Univariable and multivariable (MVA) linear regression analyses were performed. RESULTS: Forty-nine patients completed BL and EOT questionnaires. Median age was 43 years (range, 18-85 years). Most patients (59%) had stage III disease. BL financial toxicity ≥66.7, depression ≥66.7, social function ≤50, and emotional function ≤58 on the EORTC linear transformed scale of 0 to 100 were significant predictors for poor treatment experience (p ≤ .04) based on receiver operating characteristic analysis. On MVA, poor BL social function was associated with reduced EOT HRQOL (ß, -9.3; 95% CI, -16.1 to -2.6; p < .008), decreased physical function (ß, -24.4; 95% CI, -36.3 to -12.6; p < .001), and high symptom burden (ß, 26.9; 95% CI, 17.5-36.3; p < .001). Earlier disease stage predicted decreased symptom burden (ß, -6.7; 95% CI, -13.1 to -0.3; p = .039). BL financial toxicity was a significant predictor in univariable analysis (p = .001-.044) and showed a significant interaction term on MVA (p = .024-.041) for all 3 domains of poor treatment experience. Demographic and treatment-related factors were not predictive. CONCLUSIONS: Patients with cervical cancer with poor BL social function or high financial toxicity were at risk for increased symptom burden and poor HRQOL. Screening for these factors provides an opportunity for early intervention to improve treatment experience.

Exploratory analysis of the cervix tumoral HPV antigen-specific T-cell repertoire during chemoradiation and after brachytherapy.

BACKGROUND: Chemoradiation (CRT) may modulate the immune milieu as an in-situ vaccine. Rapid dose delivery of brachytherapy has unclear impact on T-cell repertoires. HPV-associated cancers express viral oncoproteins E6/E7, which enable tracking antigen/tumor-specific immunity during CRT. METHODS: Thirteen cervical cancer patients on a multi-institutional prospective protocol from 1/2020-1/2023 underwent standard-of-care CRT with pulsed-dose-rate brachytherapy boost (2 fractions). Cervix swabs at various timepoints underwent multiplex DNA deep sequencing of the TCR-ß/CDR3 region with immunoSEQ. Separately, HPV-responsive T-cell clones were also expanded ex vivo. Statistical analysis was via Mann-Whitney-U. RESULTS: TCR productive clonality, templates, frequency, or rearrangements increased post-brachytherapy in 8 patients. Seven patients had E6/E7-responsive evolution over CRT with increased productive templates (ranges: 1.2-50.2 fold-increase from baseline), frequency (1.2-1.7), rearrangements (1.2-40.2), and clonality (1.2-15.4). Five patients had HPV-responsive clonal expansion post-brachytherapy, without changes in HPV non-responsive clones. Epitope mapping revealed VDJ rearrangements targeting cervical cancer-associated antigens in 5 patients. The only two patients with disease recurrence lacked response in all metrics. A lack of global TCR remodeling correlated with worse recurrence-free survival, p = 0.04. CONCLUSION: CRT and brachytherapy alters the cervical cancer microenvironment to facilitate the expansion of specific T-cell populations, which may contribute to treatment efficacy.

Focal versus whole gland salvage brachytherapy for recurrent prostate cancer in the prostate specific membrane antigen PET era: a narrative review.

BACKGROUND AND OBJECTIVE: Prostate cancer is the second most common cause of cancer in men worldwide. A significant proportion of patients will develop biochemical failure after definitive radiotherapy and an increasing number of local failures are now identifiable with prostate specific membrane antigen (PSMA) positron emission tomography and computerized tomography (PET/CT). Brachytherapy (BT) represents an excellent option for definitive local salvage treatment. Consensus guidelines for the delivery of salvage BT are heterogenous and limited. Herein, we report the results from a narrative review analyzing whole gland and partial gland BT salvage to help guide treatment recommendations. METHODS: The PubMed and MEDLINE databases were searched in October 2022 to identify studies analyzing BT salvage in patients with recurrent prostate cancer after definitive external beam radiation therapy (EBRT). 503 initial studies met search criteria. After title and abstract screening, 25 studies met inclusion criteria and full-text review was performed. Twenty studies were included for analysis. Reports included whole gland (n=13) and partial gland or focal (n=7) salvage BT. KEY CONTENT AND FINDINGS: The median 5-year biochemical failure free survival (BFFS) for men receiving whole gland BT salvage was 52%, which is comparable to 5-year recurrence-free survival (RFS) rates for other salvage treatment modalities (radical prostatectomy (RP) 54%, high-intensity focused ultrasound (HIFU) 53%, cryotherapy 50%). However, the median rate of severe genitourinary (GU) toxicity was lower (12%) compared to published rates for other treatment modalities (RP 21%, HIFU 23%, and cryotherapy 15%). Furthermore, patients receiving partial gland salvage BT had even lower median rates of grade 3 or higher GU toxicity (4% vs. 12%) and gastrointestinal (GI) toxicity (0% vs. 3%), with 3-year BFFS of 58%. Only two studies directly comparing BT whole versus partial gland salvage were identified with comprehensive literature search and neither provided specific comparison regarding prescription dose or dose constraints. CONCLUSIONS: This narrative review identified only two studies that directly compared whole versus partial gland BT salvage treatment. Neither report provided a specific comparison of recommendations for dosimetric technique or normal structure dose constraints. Therefore, this review highlights a significant gap in the existing literature and provides an important framework to guide radiation treatment (RT) recommendations for both whole gland and partial gland salvage BT in patients with recurrent prostate cancer.

Patient Reported Outcomes for Women Undergoing Definitive Chemoradiation for Gynecologic Cancer: A Prospective Clinical Trial.

PURPOSE: Patients with gynecologic malignancies have high psychosocial and symptom burden. We report data from a prospective trial evaluating patient-reported outcome (PRO) metrics in women undergoing definitive chemoradiation with brachytherapy (BT). METHODS AND MATERIALS: A single-institution prospective trial evaluating outcomes of gynecologic cancer patients undergoing BT. Questionnaires to assess PROs at baseline, post-BT, and 60-day follow-up were collected, using European Organization for Research and Treatment of Cancer-Quality of Life Question-Core 30 and European Organization for Research and Treatment of Cancer-Quality of Life Question-Cervical Cancer Module validated metrics. Higher scores for functional scales/global health and lower scores for symptom items are favorable. European Organization for Research and Treatment of Cancer-Quality of Life Question-Core 30 mean scores were compared with a reference population. When comparing the study population between time points, medians, interquartile range, and nonparametric testing were used. RESULTS: Thirty-three patients were enrolled, and 29 (88%) completed baseline PRO metrics. Mean global health score was worse than the reference population of women with any cancer diagnosis at baseline (41 vs 59, P < .001) and decreased further at follow-up (42 vs 33, P = .005). Compared with the cervical cancer reference, our patients had significantly worse social function (62 vs 83, P = .03), financial toxicity (49 vs 10, P < .001), fatigue (49 vs 34, P = .04), nausea/vomiting (26 vs 9, P = .001), and appetite loss (36 vs 16, P = .004).The majority of patients described depression (53%), feeling less attractive (64%), life interference (66%), and/or worry (69%). At baseline, higher global health scores were associated with improved physical functioning (R20.58, P < .001), social functioning (R20.56, P < .001), and body image (R20.40, P < .001); lower scores with more symptom burden (R20.71, P < .001), financial toxicity (R20.50, P < .001), and/or sexual worry (R20.25, P = .001). CONCLUSIONS: Patients with cervical cancer have significant symptom burden and psychosocial toxicity, contributing to decreased quality of life. These data highlight the need for improved support throughout treatment for this high-risk population.

Patient-reported quality of life in adolescents and young adults with cancer who received radiation therapy.

BACKGROUND: Radiation therapy (RT) is a common treatment for adolescents and young adults (AYAs, 15-39 years old) with cancer; however, it may cause toxicities that affect health-related quality-of-life (HRQOL). Thus, we assessed HRQOL in AYAs before, during, and after RT. METHODS: We identified 265 AYAs who completed HRQOL PROMIS® surveys before (n = 87), during (n = 84), or after (n = 94) RT. Higher PROMIS® score represents more of the concept. Mean scores were compared to the general US population and minimally important differences (MIDs) were used to evaluate the impact of cancer on HRQOL. Linear regression modeling was used to evaluate the effect of clinical and demographic factors on PROMIS scores. RESULTS: Median [IQR] age was 26 [20-31] years. Cancer types varied; most had sarcoma (26%) or CNS malignancy (23%). Compared to the general US population, the before RT cohort had worse anxiety (mean score 55.2 vs. 50, MID 3, p < 0.001) and the during RT cohort had worse global physical health (mean score 44.9 vs. 50, MID 5, p < 0.001). In the during RT cohort, patients with regional/distant disease had significantly worse pain (B = 15.94, p < 0.01) and fatigue (B = 14.20, p = 0.01) than patients with localized disease. In the after RT cohort, adolescents (15-18 years) and young adults (26-39 years) had worse global physical health (B = -6.87, p < 0.01, and B = -7.87, p < 0.01, respectively) and global mental health (B = -6.74, p < 0.01, and B = -5.67, p = 0.01, respectively) than emerging adults (19-25 years). CONCLUSIONS: AYAs with cancer receiving RT experience impairments in various domains of HRQOL. Advanced cancer stage may contribute to poorer short-term HRQOL and developmental stage may contribute to differing long-term HRQOL.

Association of Patient-Reported Health-Related Quality of Life With Physician-Reported Toxicities in Adolescents and Young Adults Receiving Radiation Therapy for Cancer.

PURPOSE: Radiation therapy (RT) may cause toxicities in adolescents and young adults (AYAs, age 15-39 years) with cancer. However, the range of RT-related toxicities in AYAs and the affect on health-related quality of life (HRQOL) has not been well studied. We performed a cross-sectional study in AYAs with cancer who received RT to identify RT-related toxicities and examine their impact on HRQOL. MATERIALS AND METHODS: A total of 178 AYAs received RT and completed PROMIS HRQOL instruments from 2018 to 2022. Acute and late physician-graded Common Terminology Criteria for Adverse Events RT-related toxicities were extracted and described. Multivariable linear regression was used to evaluate the association of RT-related toxicity with HRQOL scores during and post-RT. Minimally important differences were used to evaluate the clinical relevance of relationships. RESULTS: Eighty-four AYAs completed HRQOL surveys during RT and 94 post-RT. In the during-RT cohort, 75 AYAs (89%) had acute RT-related toxicities, a majority of which were grade 1 (n = 49, 65%). AYAs who experienced acute grade 2 or greater toxicities reported worse global mental health (B = -7.35, P < .01) and worse pain (B = 5.25, P = .01) than those with acute grade 1 or no toxicities. In the post-RT cohort, the median (IQR) time from RT to survey completion was 24 (14-27) months. Forty-eight AYAs (51%) had late RT-related toxicities, a majority of which were grade 1 (n = 37, 77%). AYAs who experienced late grade 2 or greater toxicities reported worse global mental health (B = -8.07, P = .01), worse social roles (B = -9.96, P < .01), and greater sleep disturbance (B = 10.75, P < .01) than those with late grade 1 or no RT toxicities. CONCLUSION: The presence of acute and late grade 2 or greater RT-related toxicities may contribute to worse HRQOL, especially global mental health, in AYAs. Screening and early interventions to mitigate RT-related toxicities are needed to improve AYA HRQOL.

Hypothyroidism following Radiotherapy for Head and Neck Cancer: A Systematic Review of the Literature and Opportunities to Improve the Therapeutic Ratio.

(1) Background: Radiotherapy (RT) is a central component for the treatment of many head and neck cancers. In this systematic review of the literature, we aimed to characterize and quantify the published evidence on RT-related hypothyroidism, including estimated incidence, clinical risk factors, and dosimetric parameters that may be used to guide clinical decision making. Furthermore, we aimed to identify potential areas of improvement in the prevention and clinical management of RT-induced hypothyroidism, including the role of modern advanced therapeutic techniques. (2) Methods: We conducted a systemic review of the literature in accordance with Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. PubMed and Google Scholar were searched to identify original research articles describing the incidence, mechanism, dosimetry, treatment, or prevention of radiation-related hypothyroidism for adults receiving RT for the treatment of head and neck cancers. The snowball method was used to identify additional articles. For identified articles, we tabulated several datapoints, including publication date, patient sample size, estimated hypothyroidism incidence, cancer site/type, follow-up period, radiation modality and technique, use of multimodality therapy, method of thyroid function evaluation, and proposed dosimetric predictors of hypothyroidism. (3) Results: One hundred and eleven articles met inclusion criteria, reflecting a range of head and neck cancer subtypes. There was a large variation in the estimated incidence of RT-related hypothyroidism, with a median estimate of 36% (range 3% to 79%). Reported incidence increased in later publication dates, which was likely related to improved screening and longer follow up. There were a wide variety of predictive metrics used to identify patients at high risk of hypothyroidism, the most common of which were volumetric and mean dosimetrics related to the thyroid gland (Vxx%, Dmean). More recently, there has been increasing evidence to suggest that the thyroid gland volume itself and the volume of the thyroid gland spared from high-dose radiation (VSxx) may better predict thyroid function after RT. There were no identified studies investigating the role of advanced radiotherapeutic techniques such as MRI-guided RT or particle therapy to decrease RT-related hypothyroidism. Conclusions: Hypothyroidism is a common toxicity resulting from therapeutic radiation for head and neck cancer with recent estimates suggesting 40-50% of patients may experience hypothyroidism after treatment. Dosimetric predictive models are increasingly able to accurately identify patients at risk of hypothyroidism, especially those utilizing thyroid VS metrics. Further investigation regarding the potential for advanced radiotherapeutic therapies to decrease RT-induced thyroid dysfunction is needed.

Patients' Preferences for Androgen Deprivation Therapy in the Treatment of Intermediate-Risk Prostate Cancer.

Background. For men with intermediate-risk prostate cancer (IRPC), adding short-term androgen deprivation therapy (ADT) to external beam radiation therapy (EBRT) has shown efficacy, but men are often reluctant to accept it because of its impact on quality of life. Methods. We conducted time tradeoffs (score of 1 = perfect health and 0 = death) and probability tradeoffs with patients aged 51 to 78 y who had received EBRT for IRPC within the past 2 y. Of 40 patients, 20 had received 6 mo of ADT and 20 had declined. Utility assessments explored 4 ADT-related side effects: hot flashes, fatigue, loss of libido/erectile dysfunction, and weight gain. Results. The most commonly reported "worst" treatment-related complication of ADT was fatigue (50% in both cohorts) followed by reduced libido/erectile dysfunction (40% in both cohorts). The utilities for fatigue were mean = 0.71 and median = 0.92 and for reduced libido/erectile dysfunction were mean = 0.81 and median = 0.92. Utilities did not differ significantly between cohorts. Assuming a 6-mo course of ADT, men reported being willing to trade 3 mo of life expectancy to avoid fatigue due to ADT and 1.8 mo to avoid sexual side effects. Patients in the ADT cohort were willing to accept the side effects of ADT in exchange for a mean 8% absolute increase in survival, whereas patients in the no ADT cohort required a 16% increase (P < 0.001). Conclusions. When considering treatment with ADT, men with IRPC identified fatigue and sexual dysfunction as the most bothersome side effects. Patients who declined ADT expected a larger survival benefit than those who opted for treatment. Both groups expected a survival benefit exceeding that shown by recent trials, suggesting some men may be selecting treatments inconsistent with their preferences. Highlights: This study demonstrates that prostate cancer patients receiving radiation therapy are reluctant to receive androgen deprivation therapy (ADT) most commonly due to anticipated fatigue and loss of libido/erectile dysfunction.Men who had received ADT reported they would require an average 8% absolute increase in survival to tolerate its side effects, whereas those who declined ADT would require an average 16% increase.Required thresholds are well above the estimated absolute survival benefit for ADT demonstrated in recent clinical trials, suggesting an unmet need for improved patient education regarding the risks and benefits of ADT.

Locoregional Management and Prognostic Factors in Breast Cancer With Ipsilateral Internal Mammary and Axillary Lymph Node Involvement.

PURPOSE: Patients with breast cancer and ipsilateral axillary and internal mammary (IM) lymph node involvement (cN3b) often forgo IM node resection. Therefore, radiation is important for curative therapy. However, prognosis is not well described in the era of modern systemic therapy, and limited data exist to guide optimal locoregional treatment recommendations. METHODS AND MATERIALS: We retrospectively reviewed 117 patients with nonmetastatic cN3b breast cancer treated at our institution between 2014 and 2019. Staging included ultrasound evaluation of all regional nodal basins. All patients received neoadjuvant chemotherapy, resection of the breast primary, and axillary nodal dissection, followed by adjuvant radiation to the breast/chest wall and regional nodes. Institutional guidelines recommend a 10-Gy boost to radiographically resolved nodes, and a 16-Gy boost to unresolved nodes. Overall survival, recurrence-free survival (RFS), locoregional RFS, internal mammary RFS, and distant metastasis-free survival were evaluated with Kaplan-Meier analysis. A multivariable model for RFS was constructed. RESULTS: Median follow-up for 117 patients was 3.82 years. Median age at diagnosis was 46 years and 56 patients (48%) were receptor group ER+/HER2-. Mastectomy was performed in 96 patients (82%), 38 (32%) had biopsy-confirmed IMC involvement, and 8 (7%) had IM node dissection. The median initial radiation dose was 50 Gy (range, 50-55 Gy) and IMC boost 10 Gy (range, 0-16 Gy). The 5-year overall survival, IM RFS, locoregional RFS, distant metastasis-free survival, and RFS were 74%, 98%, 89%, 68%, and 67%, respectively. On multivariable analysis, a clinical complete response of the IM nodes or ypN0 (pathologic complete response of nodes) status had improved 5-year RFS with hazard ratios of 0.24 (P = .006) and 0.27 (P = .05), respectively. Extranodal extension or lymphovascular invasion were associated with worse 5-year RFS with hazard ratios of 4.13 (P = .001) and 2.25 (P = .04), respectively. CONCLUSIONS: Multimodality therapy provides excellent locoregional control of 89% at 5 years for patients with cN3b breast cancer. Adjuvant radiation yields a 5-year IM RFS of 98%. Clinical and pathologic response of IM nodes are independently prognostic for RFS.

Contemporary Outcomes After Multimodality Therapy in Patients With Breast Cancer Presenting With Ipsilateral Supraclavicular Node Involvement.

PURPOSE: Patients with breast cancer and ipsilateral supraclavicular (SCV) node involvement at the time of diagnosis (TNM cN3c) have historically had poor outcomes. Radiation therapy (RT) has an important role because SCV nodes are not routinely surgically dissected. However, optimal locoregional management, contemporary outcomes, and prognostic factors are not well defined. METHODS AND MATERIALS: We reviewed the data of patients with cN3c breast cancer treated at our institution between 2014 and 2019 with curative intent, including neoadjuvant chemotherapy, surgery, and adjuvant RT. All patients received comprehensive regional RT, including to the SCV nodes. Institutional guidelines recommend a 10-Gy or 16-Gy boost to resolved and unresolved N3 nodes, respectively. Overall survival (OS), recurrence-free survival (RFS), locoregional recurrence-free survival (LRRFS), and supraclavicular recurrence-free survival (SCRFS) were analyzed. RESULTS: Data from 173 consecutive patients were analyzed with a median follow-up time of 2.8 years. The median age was 54 years, 76 patients (44%) were estrogen receptor positive/human epidermal growth factor receptor 2 negative, 100 patients (58%) had T3/4 disease, and 10 patients (6%) underwent a neck dissection. In addition, 156 patients (90%) received a cumulative SCV dose of ≥60 Gy. The 5-year OS, SCRFS, LRRFS, and RFS rates were 73%, 95%, 86%, and 50%, respectively. The 5-year OS rate for a cumulative SCV dose of ≥60 Gy versus <60 Gy was 75% versus 39% (P = .04). In the multivariable analysis, a cumulative SCV dose of ≥60 Gy, extranodal extension, receptor status, and Eastern Cooperative Oncology Group performance status were associated with OS. The 5-year SCRFS rates with and without neck dissection were 100% versus 95% (P = .57). Among patients with a postchemotherapy SCV node size of ≥1 cm without neck dissection, the 5-year SCRFS rate was 83%. CONCLUSIONS: In one of the largest series of patients with cN3c breast cancer, multimodality therapy using adjuvant RT with a SCV boost resulted in a 5-year LRRFS rate of 86%. There is a limited role for neck dissection as the 5-year SCRFS rate was 95% overall and 83% for residual SCV disease ≥1 cm after chemotherapy with RT alone. A cumulative SCV dose of ≥60 Gy was associated with improved OS, but not SCRFS, LRRFS, or RFS. A SCV boost should be considered in these patients as treatment was well-tolerated. Despite advances in systemic therapy, nearly half of patients developed distant metastases, highlighting the need for close observation after treatment.