Purpose The metabolism of tamoxifen is influenced by various cytochrome p450 enzymes, including CYP2D6 and CYP2C19, leading to variations in the levels of endoxifen, even with the same tamoxifen dose. However, the clinical significance of endoxifen for the prognosis of breast cancer patients remains controversial. This study aimed to elucidate the relevance of endoxifen level to recurrence-free survival censored with tamoxifen discontinuation (RFSt), representing the RFS for tamoxifen itself, of breast cancer patients and determine a suitable cutoff for prognostication.
Materials and Methods The study included 478 breast cancer patients. Tamoxifen and its metabolites, including endoxifen, were measured using liquid chromatography-tandem mass spectrometry. An optimal cutoff was determined with maximally selected rank statistics. Survival analysis and Cox regression were conducted based on this cutoff.
Results An endoxifen level of 21.00 ng/mL was the optimal cutoff for prognostication. Survival analysis revealed a statistically significant difference in RFSt between the low endoxifen group (≤ 21.00 ng/mL) and the high endoxifen group (> 21.00 ng/mL) (log-rank test, p=0.032). The 10-year probability of RFSt was 83.2% (95% confidence interval [CI], 77.0 to 89.9) and 88.3% (95% CI, 83.3 to 93.5) in the low and high endoxifen groups, respectively. Multivariable Cox proportional hazards regression indicated endoxifen concentration as a significant factor associated with prognosis.
Conclusion Endoxifen could serve as a marker for appropriate tamoxifen treatment with a cutoff of 21.00 ng/mL. Based on this cutoff, therapeutic drug monitoring would benefit patients displaying suboptimal endoxifen concentrations.
Purpose We evaluated the association between changes in social support after cancer treatment and recurrence-free survival (RFS) in such patients using a prospective cohort study.
Materials and Methods Data were obtained from a prospective cohort study (NCT03131089) conducted at Samsung Medical Center (2013-2021). The primary outcome measure was RFS. Social support was measured using the social and family well-being (SFWB) domain of the Functional Assessment of Cancer Therapy-General. We calculated the changes in SFWB scores before and during treatment and the hazard ratio for RFS by comparing such changes.
Results The mean±standard deviation (SD) age of the patients was 35±3.9 years, and 71.5% and 64.8% of the patients were married and had children, respectively. The mean±SD SFWB score at baseline was 20.5±5.0 out of 26. After cancer treatment, 35.9%, 10.3%, and 53.8% of the participants had increasing, unchanged, and decreasing SFWB scores, respectively. The decreasing SFWB score group had a higher risk of mortality or recurrence than the increasing group. Risk factors for the decreasing score were the presence of children during diagnosis.
Conclusion In this cohort, changes in social support after treatment were associated with RFS in young patients with breast cancer. Health professionals should develop family interventions to help them receive proper social support.
Danbee Kang, Ka Ryeong Bae, Yeojin Ahn, Nayeon Kim, Seok Jin Nam, Jeong Eon Lee, Se Kyung Lee, Young Mog Shim, Dong Hyun Sinn, Seung Yeop Oh, Mison Chun, Jaesung Heo, Juhee Cho
Cancer Res Treat. 2023;55(2):419-428. Published online November 8, 2022
Purpose We developed a comprehensive return to work (RTW) intervention covering physical, psycho-social and practical issues for patients newly diagnosed and evaluated its efficacy in terms of RTW.
Materials and Methods A multi-center randomized controlled trial was done to evaluate the efficacy of the intervention conducted at two university-based cancer centers in Korea. The intervention program comprised educational material at diagnosis, a face-to-face educational session at completion of active treatment, and three individualized telephone counseling sessions. The control group received other education at enrollment.
Results At 1-month post-intervention (T2), the intervention group was more likely to be working compared to the control group after controlling working status at diagnosis (65.4% vs. 55.9%, p=0.037). Among patients who did not work at baseline, the intervention group was 1.99-times more likely to be working at T2. The mean of knowledge score was higher in the intervention group compared to the control group (7.4 vs. 6.8, p=0.029). At the 1-year follow-up, the intervention group was 65% (95% confidence interval, 0.78 to 3.48) more likely to have higher odds for having work.
Conclusion The intervention improved work-related knowledge and was effective in facilitating cancer patients’ RTW.
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Purpose Docetaxel/carboplatin/trastuzumab/pertuzumab (TCHP) regimen is frequently used to treat early and locally advanced human epidermal growth factor receptor 2 (HER2)–positive breast cancer (BC) in neoadjuvant setting. However, large-scaled real-world evidence did not exist.
Materials and Methods We retrospectively reviewed medical records of patients with early or locally advanced HER2-positive BC who underwent neoadjuvant TCHP followed by curative surgery at Samsung Medical Center between January 2016 and August 2020.
Results Of 447 patients, 316 (70.7%) received breast-conserving surgery and 131 (29.3%) received total mastectomy. In terms of neoadjuvant chemotherapy response, pathologic complete response (pCR) and residual cancer burden (RCB) score were analyzed. The rate of pCR was 64% a class of RCB 0 was observed in 65% of cases, RCB class I in 12%, RCB class II in 14%, and RCB class III in 2%. The 3-year event-free survival rate was 90.6%, BC with pCR occurred in 92.8%, and BC with non-pCR in 86.3% (p=0.016). In terms of distant metastasis, the 3-year distant recurrence-free survival rate was 93.5%; BC with pCR occurred in 95.9% and BC with non-pCR in 89.2% (p=0.013). Mucositis (85.2%), pain (83.2%), and diarrhea (70.5%) were the most common non-hematologic adverse events. In terms of hematologic adverse events, anemia (89.9%) was the most commonly observed adverse events followed by thrombocytopenia (29.8%).
Conclusion Neoadjuvant TCHP therapy had a pCR rate of 64% and a 3-year event-free survival of 90% in real world experience. In terms of toxicity profile, anemia was frequently observed and adequate management including occasional transfusion was required.
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Purpose
Double heterozygosity (DH) for BRCA1 and BRCA2 variant is very rare with only a few cases reported, and most those in Caucasians. In this article, we present seven unrelated cases of DH for BRCA1/2 identified from a single institution in Korea, and describe the characteristics and phenotype of DH individuals compared to those with a single BRCA variant.
Materials and Methods
This study included 27,678 patients diagnosed with breast cancer and surgically treated at Samsung Medical Center (SMC) between January 2008 and June 2020. In total, 4,215 high-risk breast cancer patients were tested for the BRCA1/2 genes, and electronic medical records from 456 cases with pathogenic/likely pathogenic variants (PVs/LPVs) were reviewed.
Results
A younger mean age at diagnosis was associated with DH than a single variant of BRCA1/2. More triple-negative breast cancer (TNBC) and higher nuclear and histologic grade cancer occurred with DH than BRCA2 variant. All 7 cases of DH were unrelated, and their mutation combinations were different. There were no Ashkenazi founder variants detected.
Conclusion
We suggest that patients with DH for BRCA1/2 variants develop breast cancer at a younger age, but the histopathologic features are similar to those of BRCA1.
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Cancer Res Treat. 2022;54(3):834-841. Published online October 13, 2021
Purpose Little is known about the impact of financial toxicity in disease-free breast cancer survivors. We aim to validate the COmprehensive Score for financial Toxicity in Korean (COST-K) and evaluate financial toxicity among disease-free breast cancer survivors.
Materials and Methods We conducted linguistic validation following a standardized methodology recommended by Functional Assessment of Chronic Illness Therapy multilingual translation (FACITtrans). For psychometric validation, we conducted a cross-sectional survey with 4,297 disease-free breast cancer survivors at a tertiary hospital in Seoul, Korea between November 2018 and April 2019. Survivors were asked to complete the COST-K and European Organization for Research and Treatment of Cancer Quality of Life Core 30 (EORTC QLQ-C30) questionnaires. The test-retest reliability, internal consistency, and validity of the COST-K were assessed using standard scale construction techniques.
Results The COST-K demonstrated good internal consistency, with a Cronbach’s α of 0.81. The test-retest analysis revealed an intraclass correlation coefficient of 0.78. The COST-K had moderate correlation (r=–0.60) with the financial difficulty item of the EORTC QLQ-C30 and week correlation with the items on acute and chronic symptom burdens (nausea/vomiting, –0.18; constipation, –0.14; diarrhea, –0.14), showing good convergent and divergent validity. The median COST-K was 27 (range, 0 to 44; mean±standard deivation [SD], 27.1±7.5) and about 30% and 5% of cancer survivors experienced mild and severe financial toxicity, respectively. Younger age, lower education, lower household income was associated with higher financial toxicity.
Conclusion The COST-K is a valid and reliable instrument for measuring financial toxicity in disease-free breast cancer survivors. Considering its impact on the health-related quality of life, more studies need to be conducted to evaluate financial toxicity in cancer survivors and design interventions.
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Purpose The purpose of this study was to assess the tumor characteristics and long-term clinical outcomes of adjuvant treatments after surgery with a curative aim for patients with breast cancer who are 65 years and older. Materials and Methods Patients with breast cancer who underwent curative surgery from 2000 to 2009 were analyzed (n=4,388). Tumor characteristics and survival outcome were compared by dividing the patients into two age groups (< 65 and ≥ 65 years old). The Kaplan-Meier method was used for comparison of survival rates by log-rank test, and a Cox regression model was used to examine the effect of variables.
Results Among 4,388 patients with invasive breast cancer, 317 patients (7.2%) were 65 years or older and the median age of all patients was 47 years (range, 18 to 91 years). Tumor characteristics were similar between the two age groups, but the older patients were treated less often with adjuvant treatments. During a median follow-up period of 122 months, recurrence-free survival (RFS) was equivalent for patients 65 years and older compared to younger patients, but significantly worse in overall survival (OS) and breast cancer–specific survival (BCSS) (5-year OS, 94.3% vs. 90.5%; p < 0.001 and 5-year BCSS, 94.7% vs. 91.8%; p=0.031). In the multivariate model, age ≥ 65 years old was identified as an independent risk factor for OS and RFS. Conclusion Elderly breast cancer appeared to have worse outcomes with very low prevalence in Korea, despite similar tumor characteristics. More active adjuvant therapies would have a role for aggressive subtypes for fit, elderly patients.
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Purpose TP53, the most frequently mutated gene in breast cancer, is more frequently altered in HER2-enriched and basal-like breast cancer. However, no studies have clarified the role of TP53 status as a prognostic and predictive marker of triple-negative breast cancer (TNBC).
Materials and Methods
We performed p53 immunohistochemistry (IHC), nCounter mRNA expression assay, and DNA sequencing to determine the relationship between TP53 alteration and clinical outcomes of TNBC patients.
Results
Seventy-seven of 174 TNBC patients were found to harbor a TP53 mutation. Patients with missense mutations showed high protein expression in contrast to patients with deletion mutations (positivity of IHC: wild type vs. missense vs. deletion mutation, 53.6% vs. 89.8% vs. 25.0%, respectively; p < 0.001). TP53 mRNA expression was influenced by mutation status (mRNA expression [median]: wild type vs. missense vs. deletion mutation, 207.36± 132.73 vs. 339.61±143.21 vs. 99.53±99.57,respectively; p < 0.001). According to survival analysis, neither class of mutation nor protein or mRNA expression status had any impact on patient prognosis. In subgroup analysis, low mRNA expression was associated with poor prognosis in patientswith a TP53 missense mutation (5-year distantrecurrence-free survival [5Y DRFS]: low vs. high, 50.0% vs. 87.8%; p=0.009), while high mRNA expression with a TP53 deletion mutation indicated poor prognosis (5Y DRFS: low vs. high, 91.7% vs. 75.0%; p=0.316).
Conclusion
Association between TP53 mutation and expression indicates a potential prognostic marker of TNBC; hence both DNA sequencing and mRNA expression analysis may be required to predict the prognosis of TNBC patients.
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Purpose
The aim of the current study is to assess the spectrum of genetic variation in the BRIP1 gene among Korean high-risk breast cancer patients who tested negative for the BRCA1/2 mutation.
Materials and Methods
Overall, 235 Korean patientswith BRCA1/2 mutation–negative high-risk breast cancerwere screened for BRIP1 mutations. The entire BRIP1 gene was analyzed using fluorescent-conformation sensitive gel electrophoresis. In silico analysis of BRIP1 variants was performed using PolyPhen-2 and SIFT.
Results
A total of 20 sequence alterations including 12 exonic and eight intronic variantswere found. Among the 12 exonic variants, 10 were missense and two were silent mutations. No protein-truncating mutation was found among the tested patients. Among the 10 missense variants, four (p.L263F, p.L340F, p.L474P, and p.R848H) were predicted to be pathogenic by both PolyPhen-2 and SIFT, and these variants were found in five patients. Of the four missense variants, p.L263F, p.L474P, and p.R848H localize to regions between the helicase motifs, while p.L340F resides in an iron-sulfur domain of BRIP1.
Conclusion
No protein-truncating mutation in BRIP1 was found among the tested patients. The contribution of BRIP1 variants is thought to be minor in Korean non-BRCA1/2 high-risk breast cancer.
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Cancer Res Treat. 2015;47(4):765-773. Published online January 13, 2015
Purpose The purpose of this study is to evaluate the role of regular postoperative surveillance to improve the prognosis of patients with breast cancer after curative surgery. Materials and Methods We retrospectively analyzed the medical records of 4,119 patients who received curative surgery for breast cancer at Samsung Medical Center between January 2000 and September 2008. Patients were divided into two groups (group I, regular postoperative surveillance; group II, control group) according to their post-therapy follow-up status for the first 5 years after surgery. Results Among the 3,770 patients selected for inclusion, groups I and II contained 3,300 (87%) and 470 (13%) patients, respectively. The recurrence rates at 5 years for groups I and II were 10.6% and 16.4%, respectively (hazard ratio, 0.85; 95% confidence interval [CI], 0.67 to 1.09; p=0.197). The 10-year mortality cumulative rates were 8.8% for group I and 25.4% for group II (hazard ratio, 0.28; 95% CI, 0.22 to 0.35; p < 0.001). In multivariate analysis for recurrence-free survival (RFS), age over 40 years (p < 0.001), histologic grade 1 (p < 0.001), and pathologic stage I (p < 0.001) were associated with longer RFS but not with follow- up status. Multivariate analysis for overall survival (OS) revealed that patients in group I showed significantly improved OS (hazard ratio, 0.29; 95% CI, 0.23 to 0.37; p < 0.001). Additionally, age over 40 years, histologic grade I, and pathologic stage I were independent prognostic factors for OS. Conclusion Regular follow-up for patients with breast cancer after primary surgery resulted in clinically significant improvements in patient OS.
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Primary breast lymphoma (PBL) is a rare disease, particularly in males. Diffuse large B cell lymphoma is the most common PBL, while follicular lymphoma is less common.
Furthermore, primary follicular lymphoma of a male breast is rarely reported. We report a male patient with primary follicular lymphoma of the breast and hepatocellular carcinoma (HCC). A 46-year-old man was diagnosed with liver cirrhosis secondary to chronic hepatitis B infection. Ten years later, he underwent segmentectomy of the liver due to HCC. Another 5 months later, he presented with a painless mass in the right chest wall. The mass was diagnosed as follicular lymphoma of the breast. The stage was IEA and he did not receive adjuvant therapy. Although only a few cases have been reported, lymphoma should be considered as a possible cause of breast mass, even in male patients.
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PURPOSE The aim of the current study was to determine the incidence, clinical presentation, and treatment outcomes of "bone-only metastases" in patients with breast cancer and to analyze the impact of hormone receptor (HR) and human epidermal growth factor receptor 2 (HER2) status on prognosis. MATERIALS AND METHODS Between 1994 and 2007, of 968 patients with metastatic breast cancer who underwent palliative management at Samsung Medical Center, 565 (57%) relapsed with distant metastases. Of the 968, 146 (15%) had bone-only metastases during a median follow-up period of 75 months. Among the 146 patients with bone-only metastases, 122 (84%) were relapsed patients after curative surgery and 24 (26%) were initially metastatic cases. RESULTS The median time from primary surgery to bone-only metastases of the 122 patients was 37 months (95% confidence interval [CI], 27 to 46 months). Bone-only metastases were more common in the HR-positive group than in the other subtypes (85% for HR+; 8.2% for HER2+; 6.8% for triple negative. Among all 146 patients, 75 (51%) were treated with hormone therapy. The median post-relapse progression-free survival was 15 months (95%CI, 13 to 17 months). The median overall survival was much longer in the HR+ patients than the HER2+ and triple negative breast cancer patients with marginal statistical significance (65 vs. 40 vs. 40 months, p=0.077). CONCLUSION Breast cancer patients with "bone-only metastases" had excellent clinical outcomes. Further study is now warranted to reveal the underlying biology that regulates the behavior of this indolent tumor, as it should identify 'favorable tumor characteristics' in addition to 'favorable preferential metastatic site.'
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Tamoxifen Rechallenge Decreases Metastatic Potential but Increases Cell Viability and Clonogenicity in a Tamoxifen-Mediated Cytotoxicity-Resistant Subline of Human Breast MCF7 Cancer Cells Yung-Chieh Chang, Chun Hei Antonio Cheung, Yao-Lung Kuo Frontiers in Cell and Developmental Biology.2020;[Epub] CrossRef
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Innovative Options for Bone Metastasis Treatment: An Extensive Analysis on Biomaterials-Based Strategies for Orthopedic Surgeons Ania Naila Guerrieri, Monica Montesi, Simone Sprio, Roberta Laranga, Laura Mercatali, Anna Tampieri, Davide Maria Donati, Enrico Lucarelli Frontiers in Bioengineering and Biotechnology.2020;[Epub] CrossRef
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Racial/ethnic differences in the outcomes of patients with metastatic breast cancer: contributions of demographic, socioeconomic, tumor and metastatic characteristics Jin-Xiao Ren, Yue Gong, Hong Ling, Xin Hu, Zhi-Ming Shao Breast Cancer Research and Treatment.2019; 173(1): 225. CrossRef
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PURPOSE To evaluate treatment results of breast conserving surgery and radiation therapy including survival rates, patterns of failure, and complication and to analyze prognostic factors. MATERIALS AND METHODS Retrospective analysis was carried out for 111 (112 cases) consecutive patients with breast cancer treated by radiation therapy after breast conserving surgery from October 1994 to April 1997. The median follow up was 45 months (range 10~66). AJCC staging was as follows: 16 cases (14%) for ductal carcinoma in situ, 46 cases (41%) for stage I, 33 cases (30%) for stage IIa, and 17 cases (15%) for stage IIb.
Radiation therapy after breast conserving surgery was delivered to whole breast with 50.4 Gy and additional 10 Gy electron beam boost to tumor bed. Adjuvant CMF or CAF chemotherapy was performed in 61 patients. RESULTS Overall three- and five-year survivals were 99% and 95%, and progression-free survival were 93%, 87%, respectively. Treatment failure occurred in 11 cases (10%); loco-regional recur rence in six; distant metastasis in five. Univariate analysis showed prognostic factor affecting survival was only T-stage. Acute radiation dermatitis were found in five cases (4%), and chronic complications were found in five (4%); one case with amputation of nipple, two cases with lymphedema requiring rehabilitation therapy and two cases with symptomatic radiation pneu monitis requiring steroid therapy. CONCLUSION Breast conserving therapy of early breast cancer including ductal carcinoma in situ showed high survival rates and low complications, and T stage was prognostic factor for survival.
But further follow-up should be needed.
PURPOSE Insular carcinoma is a rare subtype of thyroid cancer which is first described by Carcangiu in 1984. It is intermediate in aggressiveness between well differentiated and anaplastic thyroid carcinoma. But its origin, clinical features and prognosis are not yet clearly understood. We wanted to evaluate the clinical features, histologic characteristics and the prognosis of the insular thyroid carcinoma. MATERIALS AND METHODS We studied 4 cases of insular thyroid carcinoma treated in Samsung Medical Center from March 1996 to April 1998. Age, sex, clinical features, treatment, pathology and follow up findings were reviewed, retrospectively. RESULTS All patients were female and mean age was 44 years.
Three of four patients complained anterior neck mass and one patient complained low back pain and paresthesia of right thigh.
Two patients had metastatic bone lesions at the time of diagnosis.
Preoperative fine needle aspiration cytology could diagnose follicular neoplasm in 2 cases and papillary carcinoma in 1. We performed total or completion thyroidectomy and radioactive iodine therapy in 3 cases and radioactive iodine therapy alone in one.
Extra- thyroidal invasion, vascular invasion and multicentricity was noted in two cases. All four patients showed recurrence or distant metastasis in follow up period of 10~31 months and 2 of them died of distant metastasis. CONCLUSION Insular carcinoma is a special type of thyroid carcinoma with aggressive clinical course. Recurrence and extrathyroidal involvements are common and the prognosis is poorer than other well differentiated thyroid carcinoma.
PURPOSE Archival tissues of breast cancer patients were examined for VEGF expression to evaluate the relationship with other clinicopathologic factors and prognostic significance of VEGF in breast cancer. MATERIALS AND METHODS Paraffin sections from 76 patients with invasive breast cancer who have been treated at Samsung Medical Center from December, 1994 to April, 1998 were examined for VEGF expression by immunohistochemical staining using anti-VEGF antibody. We analyzed relationships between VEGF expression and tumor size, tumor stage, metastasis, steroid honnone receptors, p53, disease recurrence and survival. RESULTS Immunostaining showed variable VEGF positivity in the malignant cells and VEGF was detected more frequently in tumors than in adjacent non-tumorous breast tissues. 74 out of 76 (97.4%) was positive for VEGF. We found that the expression of VEGF was strongly correlated with the stages of breast tumor (P=0.020), lymph node metastasis (P=0.043) and PR (P=0.016). However, we could not find statistically significant relationship between VEGF expression and tumor size, ER, p53 and distant metastasis. CONCLUSION VEGF may be a useful prognostic indicator in patients with breast cancer, especially correlated with tumor stage and lymph node metastasis. This result warrants further study to confirm our findings.
PURPOSE Recently, results of many trials that intend to decide the axillary status through more conservative procedures are reported. One of these is sentinel node biopsy. This method is regarded as reasonable and selective.
Some investigators tend to omit axillary dissection in the patient who is determined to have negative node clinically and negative result in sentinel node biopsy procedure. This study was designed to know how accurate the sentinel node biopsy method can predict axillary nodal status. MATERIALS AND METHOD The patients group was selected from Department of Surgery at SMC, consisting of 111 patients with surgically curable breast cancer from Sept. 1995 to Apr. 1997. Isosulfan blue was injected in the center of mass and the margins of 4 quadrant under the general anesthesia.
Axillary dissection was done 5 minutes after injection to identify the stained lymphatics. When stained lymphatics were identified, dissection was performed along the lymphatics bidirectionally to detect the stained lymph node nearest to the primary tumor (sentinel node). After frozen biopsy of sentinel node, routine axillary node dissection was performed. Results of frozen biopsy were compared with the final pathologic results. RESULTS Sentinel node was detected in 80 of the 111 cases (72.1%) and there were 44 (55.0%) axillary metastasis cases in sentinel node detection group. In 14 of 44 cases, sentinel node was only positive. In 5 of 41, sentinel node were falsely negative for malignancy. Negative predictive value of the method is 87.8% (36/41). CONCLUSION Sentinel node biopsy method can predict the axillary nodal status in patients with breast cancer. This method can lead to more conservative treatment, eventually omitting axillary nodal dissection in selected patients.
We describe a 42-year-old woman with a primary leiomyosarcoma of the breast. It is an extremely rare tumor, with only about 16 cases reported. Usually it is presented with palpable mass of benign characters. The origin of the tumor is controversal and the differential diagnosis includes other sarcomas and metastatic ones. The uncertain behavior of it makes the management difficult but conservative surgery is available in the case of anatomically suitable. Axillary lymphatic dissection is not needed and the roles of the chemotherapy and radiotherapy are not clear. Some studies revealed a local invasion and degree of cellular atypia as some prognostic predictive value.
PURPOSE PET developed on the basis of biochemical characteristics of malignant tissues where the increase in glucose metabolism. Therefore, early and accurate detection of primary or metastatic lesion can be expected. This study is to compare PET and other traditional methods in detection of primary breast carcinoma and metastatic lesion, and to find the advantage of PET. MATERIALS AND METHODS We compared and analysed the results of PET, US, mammogr aphy, bone scan, CT and biopsy reports of the 46 patients who were examined in our hospital from September 1, 19094 to July 31, 1995. PET Trace 200 cyclotron and PET Advanced Scenner were used for FDG synthesis and imaging respectively. RESULTS 10 of the 12 cases who had preoperative PET were consistent with the results of mammography and ultrasound and 9 of the 10 cases were consistent with the pathologic results. In one case, which did mammography and PET after excis ional biopsy, PET gaves a false positive result. In the detection of axilliary node metastasis, PeT after excisional biopsy, PET gaves a false positive result. In the detection of axilliary node metastasis, PET shows 100% sensitivity and specificity but bone scan shows 100%, 72.2% respectively. CONCLUSION PET is useful for diagnosis of primary breast cancer and is superior to bone scan in specificity for diagnosis of bone metastasis and in early detection of response to treatment. Because PET cannot exclude false (+) in inflamm atory lesion, continuous investigation is needed for establishment of indication and reduction of false (+), false (-).In spite of high cost, PET may become a new and useful diagnostic tool.