Histologic features predict local recurrence after breast conserving therapy of phyllodes tumors

Background: Pathologists can distinguish benign phyllodes tumors, which very rarely metastasize, from malignant phyllodes tumors, which metastasize in approximately one fourth of patients. However, whether these same histologic criteria can be used to predict the likelihood that a phyllodes tumor will locally recur after breast conserving therapy remains controversial.Study Design: Since few patients with malignant phyllodes tumors have been treated with breast conserving surgery in any individual series, the literature was reviewed using a Medline search.Results: After local excision, 21 (111/540), 46 (18/39), and 65 (26/40) of patients with benign, borderline, and malignant phyllodes tumors, respectively, recurred in the breast. Following wide local excision, 8 (17/212), 29 (20/68), and 36 (16/45) of patients with benign, borderline, and malignant phyllodes tumors recurred in the breast.Conclusions: Malignant phyllodes tumors are much more likely than benign phyllodes tumors to recur in the breast after breast conserving surgery. This high rate of local recurrence of borderline and malignant phyllodes tumors suggests that wide local excision is less than optimal therapy, and challenges us to look for methods to improve local tumor control.     

乳腺叶状肿瘤17例诊疗分析

目的:探讨乳腺叶状肿瘤的治疗原则和影响预后因素。方法:对经手术和病理诊断确诊的17例乳腺叶状肿瘤的临床资料进行回顾性分析。结果:17例患者中良性叶状肿瘤9例,交界性叶状肿瘤5例,恶性3例。行局部肿块切除7例,单纯乳房切除术6例,改良根治术3例,姑息性肿块切除术1例。其中随访13例,平均随访时间21(5~84)个月,1例行乳腺癌改良根治术后2.5年死于远处转移,2例行局部肿块切除术后复发。结论:乳腺叶状肿瘤的预后与手术方式有关,良性和交界性应首选扩大区段切除术,切除肿瘤边缘不少于2cm;复发的交界性和恶性应尽早行单纯乳房切除术。     

The extent of surgery and prognosis of patients with phyllodes tumor of the breast

In an attempt to clarify the controversial issues related to prognosis and therapeutic aspects of phyllodes tumors (PT), we retrospectively reviewed all cases of PT treated in our hospital during the last fifteen years. Re-examining the pathology material we found 84 cases, while thirteen more cases which had been initially classified as fibroadenomas with areas of phyllodes tumor were rejected from the analysis because they were classified as fibroadenomas. Based on the criteria proposed by Azzopardi and Salvadori and adopted by WHO, we found 55 benign PT (65.14%), 14 borderline PT (16.6%), and 15 malignant PT (17.8%). The median age of the patients with benign PT was 34 years, compared to 46.5 years for those with borderline tumors and 52 years for those with malignant. The median size of benign tumors was 3 cm, 9.5 cm for borderline, and 7.25 cm for malignant. Out of 55 patients with benign PTs, 37 underwent wide local excision and the remaining 18, with small tumors, underwent enucleation. In this group of patients, there was no recurrence after a median interval of 6.65 years. Eleven patients with borderline PT underwent wide local excision and three mastectomy; one immediately after an incomplete PT excision and the remaining two 8 months and 2 years later due to a locally recurrent PT (the last one proven histologically in the permanent biopsy of the recurrence to be malignant). Twelve patients with malignant PT underwent mastectomy, either during the same operation or following the results of the permanent section biopsy. Three more patients with malignant PT underwent wide local excision. The size of the tumor in these patients was relatively small and the pathology report indicated clear margins with normal breast tissue surrounding the tumor. One patient with 8 cm diameter malignant PT, who underwent mastectomy, passed away sixteen months later from widely spread metastases. Applying the criteria of Azzopardi and Salvadori, each case of PT can be managed successfully avoiding unnecessary mastectomies.     

乳腺复发性叶状肿瘤临床病理分析

目的:探讨乳腺复发性叶状肿瘤临床及病理特征。方法:收集2011年01月至2019年12月在我院进行手术治疗的叶状肿瘤病例,并找出其中复发的病例,分析复发病例的临床及病理组织学特征。结果:叶状肿瘤137例,共有10例为复发病例,其中9例为单次复发,1例复发两次,复发病例中良性叶状肿瘤7例,交界性叶状肿瘤2例,恶性叶状肿瘤1例。所有的肿物均为局部复发,良性、交界及恶性叶状肿瘤复发率分别为5.9%、15.4%、20%。其中3例（30%）出现组织学升级,1例良性叶状肿瘤复发为交界性叶状肿瘤,1例交界性叶状肿瘤复发为恶性叶状肿瘤,1例良性叶状肿瘤第一次复发为交界性叶状肿瘤,第二次复发为恶性叶状肿瘤。免疫组化标记CD117、CD34、CD10、p53、p16在原发及复发肿瘤中表达无差异。Ki67增殖指数在复发病例中均升高,并且核分裂数也增多。结论:良性、交界性、恶性叶状肿瘤均可复发,其中恶性叶状肿瘤复发率最高,肿瘤多为局部复发,部分肿瘤复发后出现组织学升级,复发后肿瘤细胞增殖活性增强。     

Phyllodes tumor of the breast

PURPOSE: To better identify prognostic factors for local control and survival, as well as the role of different therapeutic options, for phyllodes tumors, a rare fibroepithelial neoplasm of the breast. METHODS AND MATERIALS: Data from 443 women treated between 1971 and 2003 were collected from the Rare Cancer Network. The median age was 40 years (range, 12-87 years). Tumors were benign in 284 cases (64%), borderline in 80 cases (18%), and malignant in 79 cases (18%). Surgery consisted of breast-conserving surgery (BCS) in 377 cases (85%) and total mastectomy (TM) in 66 cases (15%). Thirty-nine patients (9%) received adjuvant radiotherapy (RT). RESULTS: After a median follow-up of 106 months, local recurrence (LR) and distant metastases rates were 19% and 3.4%, respectively. In the malignant and borderline group (n = 159), RT significantly decreased LR (p = 0.02), and TM had better results than BCS (p = 0.0019). Multivariate analysis revealed benign histology, negative margins, and no residual disease (no RD) after initial treatment and RT delivery as independent favorable prognostic factors for local control; benign histology and low number of mitosis for disease-free survival; and pathologic tumor size < or = 3 cm and no tumor necrosis for overall survival. In the malignant and borderline subgroup multivariate analysis TM was the only favorable independent prognostic factor for disease-free survival. CONCLUSIONS: This study showed that phyllodes tumor patients with no RD after treatment have better local control. Benign tumors have a good prognosis after surgery alone. In borderline and malignant tumors, TM had better results than BCS. Thus, in these forms adjuvant RT should be considered according to histologic criteria.     

乳腺叶状肿瘤的诊断及治疗

目的探讨乳腺叶状肿瘤的诊断和治疗.方法对经手术和病理诊断的48例乳腺叶状肿瘤的临床病理资料进行回顾性分析.结果48例中平均年龄为43.2岁.根据肿瘤生长方式,瘤细胞异型,核分裂和肿瘤坏死进行乳腺叶状肿瘤分级,良性26例,交界性12例,恶性10例.全部病例采用手术治疗,肿瘤单纯切除术23例,良性、交界性、恶性复发分别为3/18、2/3、2/2;肿瘤扩大切除术15例,良性、交界性、恶性复发分别为0/8、1/5、1/2;乳房切除术10例,交界性、恶性复发转移分别为0/4、2/6.结论乳腺叶状肿瘤可分良性、交界性和恶性三种类别,确诊和分级主要依靠病理组织检查.提示首次肿瘤彻底切除是治疗的关键,应根据组织分级及肿瘤大小决定手术方式.     

Analysis of phyllodes tumor recurrence according to the histologic grade

Local recurrence of phyllodes tumor (PT) of the breast is an adverse outcome that can result in sarcomatous degeneration. The aim of this study was to investigate the histologic and surgical factors associated with local recurrence. A total of 193 PT cases were studied: 145 (75.1 %) benign cases, 33 (17.1 %) borderline cases, and 15 (7.8 %) malignant cases. Stratifying our analysis according to histologic grade, we investigated the relationship between disease-free survival (DFS) and both histologic and surgical factors, including histologic grade, stromal cellularity, stromal atypia, stromal mitosis, stromal overgrowth, tumor margin, type of surgical procedure (local excision, wide excision, and mastectomy), surgical margin status, and radiation therapy. In the case of benign PT, all patients with local recurrences (3.4 %) had been treated with local excision, and all recurrent tumors were also benign. The local recurrence rate for locally excised benign PTs was not associated with surgical margin status or radiation therapy. In the case of borderline PT, local excision was associated with an increased local recurrence rate (P = 0.046). In malignant PT, small tumor size (≤4.0 cm) was associated with an increased local recurrence rate (P = 0.041). Univariate analyses indicated that surgical procedure (mastectomy < local excision < wide excision; P < 0.001) was significantly associated with shorter DFS in borderline PT. A positive surgical resection margin (P < 0.001) was associated with DFS in malignant PT. The factors associated with local recurrence differed with the histologic grade of PT, as did the features of local recurrence itself. In particular, benign PT had very low rate of local recurrence regardless of surgical margin status or radiation therapy, even when treated with local excision. In the case of benign PT, no recurrent tumors had worse histologic grades than the initial tumors.     

Phyllodes tumor of the breast: stromal overgrowth and histological classification are useful prognosis-predictive factors for local recurrence in patients with a positive surgical margin

BACKGROUND: The local recurrence rate of phyllodes tumors is high and ensuring a sufficient surgical margin is considered important for local control. However, the preoperative diagnosis rate of phyllodes tumors is low and we often encounter cases in which a sufficient surgical margin is not achieved, since in routine medical practice the lesion may not be diagnosed as phyllodes tumor until postoperative biopsy of a mammary mass. Furthermore, there are no established therapeutic guidelines for surgical stump-positive phyllodes tumors. We reviewed the outcomes of excision of phyllodes tumors to investigate factors involved in local recurrence and to determine the indication for re-excision in stump-positive cases. METHODS: The subjects were 45 patients treated for phyllodes tumors at our institution from January 1980 to July 2005. Age, tumor size, surgical method, stromal cellular atypia, mitotic activity, stromal overgrowth, histological classification and surgical stump status were analyzed. RESULTS: Median age was 45 years old (range 28-75) and tumor size was 1-17 cm (median 3.5 cm). Pathologic diagnoses were benign, borderline and malignant in 31, five and nine cases, respectively, and the surgical stump was negative in 27 lesions and positive in 15. Median follow-up was 101 months (range 1-273), with local recurrence in six cases and distant metastasis in one. The local recurrence-free rate was 88, 88 and 84% and the disease-free rate was 85, 85 and 81% after 5, 10 and 15 years, respectively. Overall 10-year survival was 97%. In univariate analysis, a positive surgical margin, stromal overgrowth and histological classification were predictive factors for local recurrence after breast-conservation surgery (P = 0.0034, 0.0003, 0.026). A positive surgical stump was the only independent predictor of local recurrence in multivariate analysis (RR 0.086; 95% CI 0.01-0.743, P = 0.012). Stromal overgrowth was a predictive factor for local recurrence in cases with a positive surgical margin (P = 0.0139). CONCLUSION: Wide excision is the preferred therapy for phyllodes tumor and preoperative diagnosis is important for good local control. Re-excision is recommended in cases with a positive surgical margin and stromal overgrowth and malignancy.     

乳腺分叶状肿瘤八例报告

回顾分析8例乳腺分叶状肿瘤患者的临床病理资料,良性2例,交界性2例,恶性4例,患者年龄29～50岁,平均年龄41岁。肿块最大径平均6．6cm（3～38cm）。4例有肿块短时间内迅速增大的病史,4例曾接受2～3次肿瘤局部切除术,1例行局部扩大切除术,2例行乳腺单纯切除术,3例行乳腺改良根治术,1例胸壁复发的巨大肿瘤行皮肤与肋骨的全层切除、背阔肌-侧胸-腹直肌跨区皮瓣转移修复,1例在20个月内做过5次手术。随访3～72个月,8例患者均生存,其中2例分别于首次手术后8和21个月出现肺转移。回顾分析提示,乳腺分叶状肿瘤术前诊断困难,易局部复发,保证切缘阴性的局部扩大切除术是治疗乳腺分叶状肿瘤的合适的手段。     

乳腺叶状肿瘤复发的治疗及预后分析

目的 探讨乳腺叶状肿瘤复发的治疗方法以及预后.方法 回顾分析1972年3月至2006年6月收治的26例乳腺叶状肿瘤复发患者的临床资料.结果 26例患者的中位生存时间为96个月.原发肿瘤≥5 cm者10例,其中6例出现局部复发,4例死亡;<5 cm者16例,其中5例出现局部复发,3例死亡.复发肿瘤≥5 cm者14例,其中5例出现局部复发,3例死亡;<5 cm者12例,其中6例出现局部复发,4例死亡.原发肿瘤和复发肿瘤的大小对肿瘤再次复发(P=0.094,P=0.383)和预后(P=0.142,P=0.486)影响不显著.良性肿瘤组12例患者中,3例出现局部复发,2例死亡;恶性肿瘤组14例患者中,8例小现局部复发,5例死亡.乳腺叶状肿瘤的良恶性与肿瘤再次复发(P=0.046)和预后(P=0.028)存存相关性.结论 乳腺叶状肿瘤的恶性程度对肿瘤再次局部复发和患者预后有显著影响,而肿瘤大小与再次局部复发和预后无关.乳腺叶状肿瘤复发后的补救手术十分重要,手术必须保证一定的安全范围;多次局部复发患者的于术治疗效果较好.     

Giant malignant mammary phyllodes tumor: report of a case and review of the literature

BACKGROUND: To distinguish between a benign and malignant phyllodes tumor before surgery is difficult. Wide excision or mastectomy with adequate free margins is necessary in the case of a malignant phyllodes tumor. However, repairing the skin defect after removal of a giant malignant phyllodes tumor is a great challenge for the breast surgeon. CASE REPORT: We report the case of a 45-year-old Taiwanese woman with a giant malignant phyllodes tumor measuring 30 x 25 x 22 cm. Prior to surgery, we carefully designed a flap to cover the skin defect, following standard mastectomy with at least 2 cm free margins. Postoperatively, the patient recovered well without any wound infection or flap necrosis. During follow-up at our outpatient department, there was no evidence of local relapse or distant metastasis. CONCLUSION: Giant malignant phyllodes tumors can be treated by total mastectomy with adequate free margins, using a flap technique to cover the skin defect.     

乳腺叶状肿瘤局部复发的临床风险因素分析

目的分析乳腺叶状肿瘤局部复发的临床风险因素。方法使用SPSSCox比例风险模型分析2002年12月至2008年12月中国医科大学附属第一医院66例乳腺叶状肿瘤患者各种临床风险因素与局部复发的关系。单因素分析采用X2检验。结果本组患者的发病年龄为17—83岁（中位年龄41岁）,良性40例,交界性24例,恶性2例。局部复发15例,其中12例复发发生于区段切除术。在不同手术方式、不同组织学等级的叶状肿瘤患者之间,复发率的差异均有统计学意义（P〈0．05）。手术方式为保护因素（RR=0．151）,扩大切除术和乳房切除术者的复发风险较区段切除术者下降至66／1000和53／1000;组织学等级为危险因素（RR=5．803）,恶性和交界性叶状肿瘤患者的局部复发风险分别为良性肿瘤者的12．26倍和4．37倍。结论恶性程度高和手术方式选择不当影响预后。叶状肿瘤以手术治疗为首选,应选择切除范围扩大的手术方式,尤其是对恶性程度高的患者。     

Primary treatment of cystosarcoma phyllodes of the breast

BACKGROUND: Cystosarcoma phyllodes is a rare sarcoma of the breast. Although surgical removal is the mainstay of treatment, the extent of surgery required (excision vs. mastectomy) and the need for additional local therapy, such as radiotherapy, are unclear. The current study evaluated the rate of local and distant failure, as well as potential prognostic factors, to better define appropriate treatment strategies. METHODS: One hundred one patients treated primarily for cystosarcoma phyllodes of the breast were evaluated. These tumors were classified histologically into benign (58%), indeterminate (12%), and malignant (30%) based on well defined criteria. Stromal overgrowth (29%) was considered separately. Surgery was comprised of local excision with breast conservation (47%) or mastectomy (53%). Microscopic surgical margins were negative in 99% of cases. Six patients received adjuvant radiotherapy. RESULTS: Overall survival for the 101 patients was 88%, 79%, and 62% at 5, 10, and 15 years, respectively. For patients with nonmalignant (benign or indeterminate) and malignant cystosarcoma phyllodes, the overall survival was 91% and 82%, respectively, at 5 years, and 79% and 42%, respectively, at 10 years. Similar rates were observed based on the presence or absence of stromal overgrowth. Local recurrence occurred in 4 patients, with an actuarial 10-year rate of 8%. Eight patients developed distant metastases, with an actuarial 10-year rate of 13%. Multivariate analysis using Cox proportional hazards regression revealed stromal overgrowth to be the only independent predictor of distant failure. CONCLUSIONS: Local failure in this group of largely margin negative patients with cystosarcoma phyllodes of the breast was low, showing that breast-conserving surgery with appropriate margins is the preferred primary therapy. The current study data do not support the use of adjuvant radiotherapy for patients with adequately resected disease. Patients with stromal overgrowth, particularly when the tumor size was > 5 cm, were found to have a high rate of distant failure; such patients merit consideration of a trial that examines the efficacy of systemic therapy.     

Cystosarcoma phyllodes of the breast: a case report in a 12-year-old girl

Breast tumors in adolescents are very rare and mostly benign. Fibroadenomas are the most frequent, but within the extensive differential diagnosis, the phyllodes tumor must be mentioned, which accounts for about 1% of breast tumors and the diagnosis of which is very rare in patients younger than 20 years. There are no specific symptoms or radiological images to distinguish phyllodes tumor from fibroadenoma; therefore, histological examination is mandatory for diagnosis. Histology also allows the classification of phyllodes tumor into benign, borderline, or malignant types for appropriate surgical treatment: freemargin excision in benign tumors and mastectomy in the other two types. Fortunately, the majority of these tumors are benign, and treatment maximizes breast conservation with free infiltration margins surgery, given that this fact is the most important factor to prevent local recurrence. In this article, we describe a rare case of borderline cystosarcoma phyllodes in a 12-year-old girl.     

Small sized phyllodes tumor of the breast

From 1970 to 1988, 106 women (aged 13-63 years) suffering from phyllodes tumor of the breast underwent surgery at the Day Hospital in the Istituto Nazionale Tumori, Milan. Treatment consisted of enucleation in 57, enucleoresection in 42 and wide resection in seven. Ninety-two cases (86.8%) were benign, 12 (11.3%) borderline and two malignant. All the borderline and malignant tumors were submitted to wider resection as inpatients. The 12 borderline cases underwent wide resection while a subcutaneous mastectomy was performed in the two malignant cases. A mean follow-up of 49 months was carried out on 85 patients (range 1-186). The relapses, all in the benign group (6 cases; 6.52%), were much lower than reported by other authors (20-33%). This may be related to neoplasia size (less than 40 mm in 85.3%) and not to type of limited surgery. Although limited surgery was performed in 93.4% of cases (pre-operative diagnosis being unknown) the number of relapses was so low that re-operation with wider resection in healthy glandular tissue was not justified. However it is still performed in borderline and malignant phyllodes. The natural history of this tumor requires a prolonged follow-up since relapses may occur many months after operation (in our series 52).     

咽旁间隙肿瘤(附61例临床分析)

１９７０－１９８９年间，我院收治了６１例咽旁间隙肿瘤，大部份为良性。ＣＴ扫描对诊断和指导治疗有重要意义。良性肿瘤以手术治为主，本组手术切除４８例，其中良性肿瘤３９例，恶性肿瘤９例，均采取颈外侧进路，５例恶性肿瘤加术后放疗。良性肿瘤术后很少复发，恶性肿瘤的３、５年生存率分别为５３．３％和３６．４％。     

Immunohistochemical profile of phyllodes tumors of the breast

The immunohistochemical profiles of 16 cases of phyllodes tumor of the breast (9 benign and 7 malignant) from 15 patients were examined by the labeled streptavidin biotin method. The expression of Ki-67, p53, bcl-2, alpha-smooth muscle actin (alpha-SMA), desmin, S-100 protein, estrogen receptor (ER), and progesterone receptor (PgR) was analyzed. The number of Ki-67-positive stromal cell nuclei of malignant phyllodes tumor were significantly more prominent than the benign tumors. The p53 expression on the stromal cell nuclei showed a significant difference between malignant and benign cases (86% vs 22%; p<0.05). bcl-2 was regularly seen on the luminal cell cytoplasm and stromal cell labeling showed no significant difference between malignant and benign cases (29% vs 33%). Stromal cells were alpha-SMA positive but refractory among cases, and desmin and S-100 protein were negative. PgR was expressed in all 16 cases and ER in most cases (12/16) the expression of which was restricted to luminal epithelial cell nuclei. These findings indicate that the Ki-67 labeling index and p53 expression in the stroma would be a good diagnostic parameter distinguishing benign tumors from malignant tumors. However, the absence of steroid receptor expression in stromal cells suggests the ineffectiveness of hormonal therapy for phyllodes tumor of the breast.     

Prognostic Evaluation of Proliferative Activity and DNA Content in the Phyllodes Tumor of the Breast: Immunohistochemical and Flow Cytometric Study of 118 Cases

The goal of this study was the prognostic evaluation of histology, mitotic rate, S-phase fraction (SPF) and expression of proliferative antigen Ki67 and p53 protein in phyllodes tumor of the breast. The study was performed in the group of 118 patients with phyllodes tumor treated by surgery from 1952 to 1998. Mitotic rate was assessed on the representative histological specimens. Expressions of Ki67 and p53 were evaluated by immunohistochemistry on a section from the corresponding paraffin blocks which were also used for flow cytometric DNA evaluation. Histologically, 52 tumors were benign (LGM), 24 borderline malignancies (BM) while among 42 malignant tumors, 20 were monomorphous (HGM) and the remaining 22 revealed heterologic elements (HGH). Tumor recurrencies occurred in 17 patients, predominantly during the first three years after surgery, and 13 patients died of the tumor (1 BM, 12 both malignant variants). Multivariate analysis demonstrated mitotic rate, SPF and p53 expression as independent prognostic parameters for the disease-free survival. Histological tumor type and expression of Ki67 influenced independently the overall survival. In conclusion, the histological type of tumor phyllodes forms the basis for the prognosis of clinical outcome, but the indicators of the proliferative activity, especially Ki67 index, are valuable prognostic factors among patients with malignant variant of phyllodes tumor of the breast. Expression of the p53 protein in tumor cells could be also useful when the percentage of cells and intensity of expression are considered.     

Malignant phyllodes tumor of the breast: review of the literature and case report of stromal overgrowth

Cystosarcoma phyllodes constitutes only 0.3-0.9% of all breast tumors. The term "sarcoma" was initially used because of its fleshy appearance, a more modern term is Phyllodes tumor (PT). The behavior of PT constitutes a spectrum from benign and locally recurrent to malignant and metastatic. In a general surgical series, 6.2% of the tumors were malignant. The microscopic appearance of PT is that of epithelial elements and connective tissue stroma. Malignancy is determined by characteristics of the stroma. The metastatic spread of malignant PT is mainly hematogenous to lung, with infrequent lymphatic involvement. Wide local excision with 2 cm margins is the treatment of choice. In 20% of both benign and malignant cases, PT will locally recur. There is no proven benefit of radiation or chemotherapy, although radiotherapy may be useful in selected cases. We present a case of a sarcomatous overgrowth in a malignant phyllodes tumor involving multiple histologic types.     

En Bloc Excision of Phyllodes Tumor of the Breast: Radical Approach Heralds Better Outcome

IntroductionSurgery is the primary treatment of phyllodes tumor of the breast, and margins are the most important risk factor associated with local recurrence. We conducted a retrospective audit of 433 patients treated at our center.Patients and MethodsWomen who presented with phyllodes tumors between 1999 and 2017 were included in the analysis. Data was collected from the hospital medical records, telephonic interviews, and electronic mail.ResultsOf the 433 women included in this study, 177 (40.9%) had benign phyllodes tumors, 84 (19.4%) were borderline, 131 (30.3%) were malignant, and 41 (9.5%) had sarcoma. A history of previous excision was noted in 154 (35.6%) patients, of which 104 presented with local recurrence. Of the total patients, 209 (48.3%) underwent breast conservation surgery; the median pT was 6 cm. At a median follow-up of 37.9 months, the 5-year disease-free survival (DFS) was 82.9%. On multivariate analysis, the factors that impacted DFS were histology (hazard ratio, 4.1; 95% confidence interval [CI], 1.5-10.9; P = .005) and history of previous excision biopsy (hazard ratio, 3.39; 95% CI, 1.76-6.52; P < .001). We analyzed 231 women who presented without any prior excision separately, wherein at a median follow-up of 44.1 months, the DFS was 92.1% (95% CI, 92.05%-92.15%). In addition, less recurrences were noted in this cohort (5.6% [13/231] in no-excision biopsy vs. 12.5% with surgery done prior to presentation to our institute).ConclusionA previous history of excision and the histologic subtype of phyllodes tumor are factors that have an impact on DFS, thus emphasizing the need for appropriate surgical planning and en bloc excision of the phyllodes at presentation.