Outcome of Patients (pts) with Chronic Myeloid Leukemia (CML) Treated with Tyrosine Kinase Inhibitors (TKI) Who Have a History of Prior Malignancies,

Blood ◽  
2011 ◽  
Vol 118 (21) ◽  
pp. 3787-3787
Author(s):  
Paul B Koller ◽  
Hagop M Kantarjian ◽  
Charles Koller ◽  
Elias Jabbour ◽  
Susan O'Brien ◽  
...  

Abstract Abstract 3787 Background: The natural history of CML has been irrevocably changed since the advent of TKIs with pts living longer than they ever have. Some patients have a history of previous cancers by the time they are diagnosed with CML. These pts' long-term prognosis has never been previously described. Aims: To determine the effect of prior malignancy on patient outcome after diagnosis of CML. Methods: The primary objective was to determine outcome of pts with a previous diagnosis of malignancy (PM) vs a group without (nPM). Patients included in clinical trials of TKI as initial therapy for CML in chronic phase from July 2000 to January 2011 were reviewed. Results: Of the 471 CML pts treated with frontline TKIs 47 (10%) had a PM before their CML diagnosis and 5 (1%) pts PM status could not be obtained. The median age of the patients with a PM was 60 (30–84) compared to 46 (15–86) for those with no PM. There were no significant differences in clinical characteristics between PM and nPM patients. The median from diagnosis of a PM and a diagnosis of CML was 69 months (mo) (7 mo to 707 mo). The five most common PMs were: non-melanoma skin cancer in 14 (30%), breast cancer in 10 (21%), melanoma in 5 (11%), colorectal cancer in 5 (11%), and prostate cancer in 5 (11%). “Six pts (13%) had more than one PM and 2 of those 6 had 3 PM before the diagnosis of CML, the other 4 pts had 2 PM. The PMs were treated prior to the diagnosis of CML in the following ways: 17 (36%) pts received chemotherapy for their PM, 17 (36%) received radiotherapy, and 43 (91%) received surgery. At the time of CML diagnosis 3 (6%) pts had active cancer, while the remainder of the pts with a PM were thought to be in remission. Two (4%) pts were on active therapy for their prior cancer diagnosis at the time they started on CML therapy (Tamoxifen for breast cancer in both). After the diagnosis of CML, 6 (13%) pts had a recurrence of their PM including 2 pts with basal cell cancer, and 1 each with melanoma, breast cancer, prostate cancer, and lymphoma. These recurrent malignancies were treated as follows: 3 with radiation, 2 had surgery, and 2 with chemotherapy. Five of these 6 pts continued TKI while receiving therapy for PM. The median time between diagnosis of CML and relapse of PM was 18 months. Median remission of the PM was 151 months. Also, 6 (13%) pts had a new malignancy after CML diagnosis: 2 pts with squamous skin carcinoma, and 1 each with chronic lymphocytic leukemia, papillary thyroid carcinoma, mucoepidermoid carcinoma, and large B-cell lymphoma. Treatments for the new onset malignancy after the diagnosis of CML include: surgery (4), chemotherapy (2), radiation (1), and observation (1). The median time between diagnosis of CML and a new malignancy was 39 months. Six of the 47 pts are deceased: 2 died of their PM, 2 died secondary to treatment complications for their PM, 2 died of cardiovascular issues unrelated to a cancer diagnosis. None died of CML. Initial treatment for CML was imatinib 400mg in 4/47 (9%) PM and 69/419 (16%) nPM, imatinib 800mg in 15/47 (33%) PM and 189/419 (45%) nPM, dasatinib in 11/47 (24%) PM and 78/419 (19%) nPM, and nilotinib in 16/47 (35%) PM, and 83/419(20%) nPM. The outcome of pts with PM and nPM is presented in Table 1. There was no significant different in patient outcome between pts with PM and nPM. Conclusion: Pts with CML who have prior malignancies have the same excellent outcome as patients with no prior malignancies. In the few instances in which concomitant therapy for other malignancies was required during therapy with TKI this could be accomplished with no significant toxicity. Thus, the history of prior malignancy in a patient who develops CML should not affect the decision to treat with TKI. Disclosures: Cortes: Pfizer Inc: Consultancy, Research Funding; BMS: Consultancy, Research Funding; Novartis: Consultancy, Research Funding.

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 2193-2193
Author(s):  
Elizabeth B Lamont ◽  
Andrew J. Yee ◽  
Stuart L. Goldberg ◽  
Andrew D Norden

Background: Over the past 20 years, observational data from usual care clinical oncology settings has been leveraged to inform estimates of cancer treatment-associated benefits and risks among patients not treated on clinical trials. Increasing genomic testing to inform treatment decisions in usual care settings now meaningfully augments traditional observational data, positioning it to provide insights beyond clinical care into tumor biology. We studied patients with newly diagnosed multiple myeloma (MM), comparing cytogenetic test patterns according to history of prior malignancy. Methods: In this retrospective cohort study, we identified 2,380 patients from the COTA real-world database (RWD) who were newly diagnosed with MM in the years 2010-2018. The COTA RWD is a de-identified composite of both abstracted electronic health record and administrative data pertaining to patients receiving their cancer care at one of COTA's clinical oncology practice partners. Among these patients, 1769 (74%) had evidence of MM-associated cytogenetic testing with fluorescent in-situ hybridization (FISH) within the 120 days surrounding their date of diagnosis. The 1,769 patients form the analytic cohort. We compared patients' FISH results for t(4;14), deletion(17p), t(14;16), deletion(13), t(14;20), t(6;14), t(11;14), deletion (1p), and amplification(1q) according to their history of prior malignancy. Results: Within the cohort, 263 prior malignancies were identified in 241 patients (14%, 241/1,769). Two-hundred and twenty-one patients (92%) had one prior malignancy, 28 (7.9%) had two prior malignancies, and one (<1%) had four prior malignancies. The most common prior malignancies were prostate (n=50), breast (n=19), melanoma (n=14), skin (n=13), and cervix (n=6). Amplification of the long arm of chromosome one (amp(1q)) was noted in 31% of patients (75/241) with a prior malignancy vs. 24% of patients (370/1,528) without (chi2 test p=0.02). Overall 25% of patients had amp(1q). No other translocations, amplifications, deletions were associated with prior cancers. A non-parametric test for trend revealed a strong positive association between patients' malignancy count (range 0-4) and amp1q (p<0.01). MM patients with prior lymphomas and prior melanomas also had high rates of amp(1q), though these were not significantly different from patients without these prior malignancies. In a multivariable logistic regression model that adjusted for patient demographic attributes, other known potentially collinear MM poor prognostic factors (i.e., revised ISS stage, IgA sub-type, lambda light chains) and adjusted standard errors for clustering of patients within treatment settings, a history of prostate cancer remained clinically and statistically significantly positively associated with amp(1q) (OR 2.1, 95% CI: 1.9-2.2) as did history of two or more prior malignancies (OR 2.8, 95% CI: 2.3-3.3). Of note, amp(1q) was positively associated with IgA subtype (OR 1.5, 95% CI: 1.3-1.6) and the presence of lambda subtype (OR 1.3, 95%CI: 1.3-1.4). Conclusions: Using RWD, we found that newly diagnosed MM patients with histories of prostate cancer and those with two or more prior malignancies were more likely to have amp(1q), a poor prognostic marker in MM. Gains in 1q have previously been identified among patients with prostate and lymphoid cancers, but to our knowledge this is the first study to identify an association with a prior history of cancer, especially prostate cancer, and amp(1q) in MM. This relationship is worth further exploration of whether there is a common pathway associated with for example risk of prostate cancer and amp(1q) in MM. Clinical trials are less likely to answer this question as patients with prior malignancies are often excluded from enrollment. Overall, the results reported suggest that RWD is an efficient and comparatively inexpensive tool to support research in cancer biology through hypothesis generating and testing analyses of linked real-world phenotypic and genotypic data. Disclosures Lamont: COTA: Employment. Yee:Celgene: Consultancy, Honoraria, Research Funding; Karyopharm: Consultancy; Bristol-Myers Squibb: Consultancy, Research Funding; Takeda: Consultancy; Adaptive: Consultancy; Amgen: Consultancy, Honoraria. Goldberg:Cancer Outcomes Tracking and Analysis (COTA) Inc.: Equity Ownership; COTA: Equity Ownership; Bristol-Myers Squibb: Consultancy. Norden:COTA: Employment, Equity Ownership.


Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 5573-5573
Author(s):  
Ahmad Alhuraiji ◽  
Lorenzo Falchi ◽  
Michael Keating ◽  
Zeev Estrov ◽  
Paolo Strati ◽  
...  

Abstract Introduction: Patients (pts) with Chronic Lymphocytic Leukemia (CLL) are known to have an increased risk of other cancers. Treatment with lenalidomide has been associated with an increased rate of solid tumors (ST) in pts with multiple myeloma (MM). However, the occurrence of ST in patients with CLL receiving therapy with lenalidomide remains unknown. Methods: We evaluated the development of ST in pts with CLL that received front-line treatment with lenalidomide as monotherapy or in combination with rituximab in clinical trials conducted at our institution. We report the characteristics and timing of ST, as well as patient outcome. All pts enrolled had indication for therapy according to the International Workshop on CLL guidelines and no history of malignancy for three years, with the exception of treated malignancy with indolent behavior such as prostate cancer that was treated with surgery or radiation therapy. Results: One-hundred twenty-one pts were enrolled in two consecutive phase II clinical trials of frontline therapy with lenalidomide (N = 61, 51%) or combination of lenalidomide and rituximab (N = 60, 49%). Baseline pts characteristics are shown in Table 1, median age was 66 yrs and 24% of patients were age 70 or older. At a median follow up after lenalidomide therapy of 41 months (range 1-102+), 7 (6%) pts developed a ST: renal cell carcinoma (RCC, 3 pts), localized breast cancer (LCIS and DCIS, 2 pts), pancreatic adenocarcinoma (1 pt) and colon adenocarcinoma (1 pt) (details are shown in Table 2). The median time interval between receiving lenalidomide-based therapy and the development of ST was 1.5 years (range 0-8.5). At the time of this report, 5 out of 7 pts with ST are alive and cancer-free. Two pts died: 12 months and 18 months after developing ST from progression of pancreatic adenocarcinoma and heart failure, respectively. Since pts with CLL have a high rate of non-melanoma skin neoplasms (NMSC), we also monitored patients for new diagnoses of skin cancers. Seven (6%) additional pts developed NMSC, 4 of these pts had prior history of NMSC. All cases of NMSC were superficial and did not require systemic therapy. Additionally, because of the high median age of this population, we reviewed prior history of malignancies. Eleven (9%) pts had history of ST [prostate cancer (N = 9), bladder cancer (N = 1), RCC (N = 1)]. Twenty-two pts (18%) had skin cancers (NMSC, (N = 21) and 1 pt had history of melanoma. None of them had received chemotherapy, two had radiation therapy [prostate cancer = 1, NMSC (basal cell carcinoma of the nose (1 pt)]. All ST were in remission before starting therapy with lenalidomide for more than 3 years as per the inclusion criteria. Conclusions: Seven cases of ST were observed in our population of 121 pts with CLL that received initial therapy with lenalidomide, after a median follow-up of 3.5 years. The most common neoplasm was RCC followed by in-situ breast cancer. In our limited experience the timing, number and type of malignancies do not appear to mirror what was seen in patients with MM. However, this comparison may be limited by the size of our patient population and length of follow-up. Our group reported the incidence of ST in patients treated with FCR. After a similar follow-up the incidence of second malignancies was similar (5.9%), but the type of malignancies was different, although NMSC remained the most common ST in both experiences. Reporting the incidence of other malignancies in patients with CLL enrolled in large studies, including those of novel targeted agents, will help understanding the expected incidence of ST and how novel treatments modulate such risk. Disclosures Jain: Pharmacyclics: Consultancy, Honoraria, Research Funding; ADC Therapeutics: Consultancy, Honoraria, Research Funding; Pfizer: Consultancy, Honoraria, Research Funding; Celgene: Research Funding; Seattle Genetics: Research Funding; Infinity: Research Funding; Abbvie: Research Funding; Genentech: Research Funding; Incyte: Research Funding; Servier: Consultancy, Honoraria; Novimmune: Consultancy, Honoraria; BMS: Research Funding; Novartis: Consultancy, Honoraria. Thompson:Pharmacyclics: Consultancy, Honoraria.


BMC Urology ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yechen Wu ◽  
Xi Chen ◽  
Duocheng Qian ◽  
Wei Wang ◽  
Yiping Zhang ◽  
...  

Abstract Background A history of prior cancer commonly results in exclusion from cancer clinical trials. However, whether a prior cancer history has an adversely impact on clinical outcomes for patients with advanced prostate cancer (APC) remains largely unknown. We therefore aimed to investigate the impact of prior cancer history on these patients. Methods We identified patients with advanced prostate cancer diagnosed from 2004 to 2010 in the Surveillance, Epidemiology, and End Results (SEER) database. Propensity score matching (PSM) was used to balance baseline characteristics. Kaplan–Meier method and the Cox proportional hazard model were utilized for survival analysis. Results A total of 19,772 eligible APC patients were included, of whom 887 (4.5 %) had a history of prior cancer. Urinary bladder (19 %), colon and cecum (16 %), melanoma of the skin (9 %) malignancies, and non-hodgkin lymphoma (9 %) were the most common types of prior cancer. Patients with a history of prior cancer had slightly inferior overall survival (OS) (AHR = 1.13; 95 % CI [1.02–1.26]; P = 0.017) as compared with that of patients without a prior cancer diagnosis. Subgroup analysis further indicated that a history of prior cancer didn’t adversely impact patients’ clinical outcomes, except in patients with a prior cancer diagnosed within 2 years, at advanced stage, or originating from specific sites, including bladder, colon and cecum, or lung and bronchus, or prior chronic lymphocytic leukemia. Conclusions A large proportion of APC patients with a prior cancer history had non-inferior survival to that of patients without a prior cancer diagnosis. These patients may be candidates for relevant cancer trials.


BMC Cancer ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Zheng-Ju Ren ◽  
De-Hong Cao ◽  
Qin Zhang ◽  
Peng-Wei Ren ◽  
Liang-Ren Liu ◽  
...  

SLEEP ◽  
2020 ◽  
Vol 43 (Supplement_1) ◽  
pp. A400-A400
Author(s):  
B Piro ◽  
S Garland ◽  
P Jean-Pierre ◽  
B Gonzalez ◽  
A Seixas ◽  
...  

Abstract Introduction Sleep disturbances are a common problem among cancer survivors. Also, cancer patients can have altered circadian rhythms and these changes can continue to affect the patient long after the conclusion of their treatment. This analysis aims to investigate how the sleep and wake times of cancer survivors differ from the rest of the population, depending on the type of cancer. Methods Data from the 2015-2016 National Health and Nutrition Examination Survey were used. Population-weighted data on N=5,581 individuals provided complete data. History of breast, prostate, and skin cancer (melanoma or other) was self-reported. Sleep duration was self-reported in half-hour increments, and typical bedtime and waketime was self-reported. Covariates included age, sex, and race/ethnicity. Weighted linear regressions with sleep duration, bedtime and waketime were examined, with each cancer type as predictor. Results Prevalence was 1.7% for prostate cancer, 1.5% for breast cancer, 2.3% for non-melanoma skin cancer, and 0.8% for melanoma. In adjusted analyses, prostate cancer was associated with an additional 26.5 minutes of average total sleep (95%CI 2.2,50.9, p=0.03), a 23.1 bedtime minutes earlier (95%CI -40.4,-5.8, p=0.009), and no difference in waketime. Breast cancer was associated with a bedtime that was 41.1 minutes later (95%CI 10.3,72.0, p=0.009) and a waketime that was 48.7 minutes later (95%CI 12.5,84.9, p=0.008), but no difference in sleep duration. No statistically significant effects were seen for either type of skin cancer, melanoma or non-melanoma. Conclusion Prostate cancer was associated with an earlier bedtime and associated increased sleep time. Breast cancer, on the other hand, was associated with a phase delay of the sleep period but no change in sleep duration. Skin cancer was not associated with differences in sleep duration or timing. These findings may have implications for not only treatment of sleep problems in different types of cancer, but also possible circadian mechanisms. Support Dr. Grandner is supported by R01MD011600


2019 ◽  
Vol 7 ◽  
pp. 232470961984723
Author(s):  
Leila Moosavi ◽  
Phyllis Kim ◽  
An Uche ◽  
Everardo Cobos

In this article, we present a patient diagnosed synchronously with metastatic male breast cancer and prostate cancer. This is a 63-year-old male and recent immigrant from Nigeria, who sought medical attention for progressively worsening of shortness of breath and acute progression of a chronic right breast mass. An invasive breast carcinoma was diagnosed by the core biopsy of the right breast mass. Within 2 months of his breast cancer diagnosis, the patient also was diagnosed with prostate adenocarcinoma after being worked up for urinary retention. By presenting this patient with a synchronous diagnosis with metastatic male breast cancer and prostate cancer, history of chronic right breast mass, and gynecomastia, we speculate on possible cancer etiologies and risk factors.


2016 ◽  
Vol 195 (4S) ◽  
Author(s):  
Nikita Abhyankar ◽  
Kent Hoskins ◽  
Michael Abern ◽  
Gregory Calip

2020 ◽  
Vol 29 (4) ◽  
pp. 662-673 ◽  
Author(s):  
Lucas A Salas ◽  
Sara N Lundgren ◽  
Eva P Browne ◽  
Elizabeth C Punska ◽  
Douglas L Anderton ◽  
...  

Abstract Prior candidate gene studies have shown tumor suppressor DNA methylation in breast milk related with history of breast biopsy, an established risk factor for breast cancer. To further establish the utility of breast milk as a tissue-specific biospecimen for investigations of breast carcinogenesis, we measured genome-wide DNA methylation in breast milk from women with and without a diagnosis of breast cancer in two independent cohorts. DNA methylation was assessed using Illumina HumanMethylation450k in 87 breast milk samples. Through an epigenome-wide association study we explored CpG sites associated with a breast cancer diagnosis in the prospectively collected milk samples from the breast that would develop cancer compared with women without a diagnosis of breast cancer using linear mixed effects models adjusted for history of breast biopsy, age, RefFreeCellMix cell estimates, time of delivery, array chip and subject as random effect. We identified 58 differentially methylated CpG sites associated with a subsequent breast cancer diagnosis (q-value &lt;0.05). Nearly all CpG sites associated with a breast cancer diagnosis were hypomethylated in cases compared with controls and were enriched for CpG islands. In addition, inferred repeat element methylation was lower in breast milk DNA from cases compared to controls, and cases exhibited increased estimated epigenetic mitotic tick rate as well as DNA methylation age compared with controls. Breast milk has utility as a biospecimen for prospective assessment of disease risk, for understanding the underlying molecular basis of breast cancer risk factors and improving primary and secondary prevention of breast cancer.


Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 2685-2685
Author(s):  
Yvette L. Kasamon ◽  
Robert A. Brodsky ◽  
Michael J. Borowitz ◽  
Pamela A. Crilley ◽  
Richard F. Ambinder ◽  
...  

Abstract Abstract 2685 Poster Board II-661 Background: Although standard therapies cure most adolescents and young adults with Burkitt's lymphoma/leukemia (BL), older patients (pts) have an inferior prognosis with an estimated 1-year survival of 50%. The inferior outcome is attributable to both insufficient efficacy and excess toxicity. Cyclophosphamide (Cy) has long been recognized to be arguably the most active agent in BL. Prior work at our institution showed that high-dose Cy, equivalent to transplantation doses, could be given without stem cell rescue with minimal toxicity even in older pts. Patients and Methods: A phase II trial for pts age ≥ 30, based on intensive Cy and incorporating rituximab but no anthracycline, was developed with a primary endpoint of 1-year overall survival. Entry requirements included newly diagnosed BL or atypical BL; any performance status (PS); HIV negative; and no significant cardiac dysfunction. Renal failure, even if necessitating dialysis, was permitted if it was acute. Treatment consisted of 3 cycles, with successive cycles beginning on day 15 or when ANC was ≥ 500/μL. Cycles 1 and 2 consisted of Cy 1500 mg/m2 IV day 1; vincristine 1.4 mg/m2 (2 mg cap) day 1; prednisone 100 mg days 1-5; rituximab 375 mg/m2 IV days 1 and 8; methotrexate 3 g/m2 IV day 8 with leucovorin rescue; cytarabine 100 mg intrathecally days 1, 4, and 11; and filgrastim. Cycle 3 consisted of rituximab 375 mg/m2 IV day 1; high-dose Cy (50 mg/kg IV days 2, 3, 4, and 5) with uroprotection; filgrastim; and rituximab 375 mg/m2 IV weekly for 4 weeks once ANC was ≥ 1000/μL. Eligibility for cycle 3 included ECOG PS < 4; no disease progression or uncontrolled meningeal disease; not on dialysis; and transaminases ' 5X upper limit of normal. Results: A prespecified interim analysis of the first 12 of a planned 20 evaluable pts is presented. Diagnosis was BL in 8 and atypical BL/unclassifiable high-grade lymphoma with features intermediate between BL and diffuse large B-cell lymphoma in 4. Median age was 56 (range 34 – 75), 8/12 (67%) had Ann Arbor stage III/IV disease, and all were high-risk by Magrath's criteria. PS ranged from 0 to 4. Two pts received hemodialysis on presentation. For all pts, actuarial event-free survival and overall survival (Figure) are 66% and 75%, respectively, at both 1 year and 2 years after treatment initiation. Three pts died during cycle 1: tumor lysis syndrome on day 1, neutropenic sepsis on day 8, multiorgan failure on day 46 after respiratory arrest on day 20. All of the other 9 pts completed protocol therapy: 8 (89%) achieved anatomic CR/CRu as well as a complete metabolic response by PET, and are event-free at a median of 29 months (range < 1 – 44 months) after therapy completion. The remaining pt had residual marrow disease followed by progression and is in remission 1 year after myeloablative allogeneic BMT. Adverse events in these 9 pts included 7 neutropenic fevers; 1 non-neutropenic bacteremia; and 1 self-limited episode of pericarditis with rapid atrial fibrillation. Grade 3 peripheral neuropathy was limited to 2 pts. The planned dose intensity was achievable: median time to cycle 2 was 15 days (14 – 21), and median time from start of cycle 1 to start of cycle 3 was 31 days (28 – 35). Median time to neutrophil recovery after the last dose of Cy was 16 days (10 – 21); median time to platelets ≥ 20,000/μL, without transfusion in the preceding week, was 22 days (0 – 30). Early stopping criteria for response or all-cause mortality have not been met. Conclusion: A very short regimen based on intensive Cy without anthracycline produces a high rate of durable CR's in older, poorer-risk pts with BL or atypical BL. Disclosures: Kasamon: Genentech: Research Funding. Swinnen:Genentech: Consultancy, Research Funding; Enzon: Consultancy; Abbot: Consultancy, Research Funding.


Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 1676-1676
Author(s):  
Amer M. Zeidan ◽  
Jessica B. Long ◽  
Rong Wang ◽  
James B. Yu ◽  
Jane Hall ◽  
...  

Abstract BACKGROUND: Chemotherapy and combined chemo-radiotherapy are well-documented risk factors for myelodysplastic syndromes (MDS) and acute myeloid leukemia (AML), collectively referred to in this setting as therapy-related myeloid neoplasms (t-MN). While single-modality radiotherapy post-lumpectomy has been shown to reduce local recurrence among breast cancer patients, data regarding the impact on development of t-MN are limited and inconsistent. METHODS: We conducted a retrospective cohort study of elderly female breast cancer patients (aged 67-94 years at diagnosis) who were diagnosed with in situ or stage 1-3 breast cancer between 1/1/2004 and 12/31/2011 using the National Cancer Institute's Surveillance, Epidemiology and End Results (SEER)-Medicare linked database. Eligibility criteria included 1) enrollment in Medicare Parts A and B continuously through death or end of study (12/31/2013); 2) underwent surgery for breast cancer within 9 months of diagnosis; and 3) were not diagnosed with other neoplasms prior to breast cancer diagnosis. Delivery of radiation therapy was ascertained using the Healthcare Common Procedural Coding System codes. In order to be considered a recipient of radiotherapy, the patient had to receive radiotherapy within 9 months of diagnosis and had any treatment delivery code for brachytherapy or ≥ 4 treatment delivery codes for external bream radiotherapy. Competing-risk analysis was used to assess the risk of developing t-MN in radiotherapy-treated patients compared to those treated with surgery alone. Patients were censored at the time of receiving chemotherapy or at development of another malignancy (aside of t-MN) during follow-up. Competing-risk analysis was used to assess the risk of developing secondary MN women who received radiation therapy compared to those who did not. These models included adjustment for breast cancer diagnosis age and year, number of comorbidities, anemia, functional status prior to breast cancer diagnosis and breast cancer stage. RESULTS: A total of 63,543 patients were included in the study. Median follow-up for all participants was 48 months. A total of 32,809 patients (51.6%) received radiotherapy post-surgery while 30,734 patients (48.4%) were not treated with radiotherapy post-surgery. Patients who received radiotherapy had significantly better overall survival than those who did not (median overall survival [OS] 107 vs. 89 months, p<0.001). During follow-up, a total of 167 patients were diagnosed with MDS or AML (89 cases among those who received radiotherapy and 78 among those who did not receive radiotherapy). The median time to develop MDS/AML was 24 months. In the unadjusted model, there was no significantly increased risk of subsequent AML/MDS among breast cancer patients who received single-modality radiotherapy compared to those who underwent surgery alone (hazard ratio [HR] = 1.11, 95% confidence interval [CI]: 0.82-1.51, p=0.49). Similarly, no significant difference in subsequent MDS/AML according to receipt of radiotherapy was observed in the adjusted analysis (HR = 1.16, 95% CI: 0.84-1.59, p=0.36). CONCLUSIONS: Older patients with early breast cancer who were treated with single-modality radiotherapy post-surgery did not have a higher risk of subsequent MDS/AML compared to patients who did not receive radiotherapy, and the overall rate of MN was low.While additional studies with a longer duration of follow-up are warranted, these results suggest that the single-modality radiotherapy administered in the contemporary management of early breast cancer is not a risk factor for t-MN in this population. Disclosures Yu: 21st-Century Oncology LLC: Research Funding. Gore:Celgene: Consultancy, Honoraria, Research Funding. Gross:Johnson and Johnson: Research Funding; Medtronic: Research Funding; 21st-Century Oncology LLC: Research Funding. Ma:Celgene Corp: Consultancy; Incyte Corp: Consultancy. Davidoff:Celgene: Consultancy, Research Funding.


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