Long-Term Survival Outcomes and Risk Factors for Axillary and Locoregional Recurrence in Japanese Patients with Sentinel Node-Positive Breast Cancer Treated in Accordance with the ACOSOG Z0011 Strategy.

INTRODUCTION: In 2018, we reported the results of a study to assess the feasibility of applying the ACOSOG Z0011 criteria to Japanese patients with early-stage breast cancer (median follow-up, 3 years). Their results over the longer term can now be presented. Risk factors for axillary and locoregional recurrence in Z0011-eligible patients are unknown. METHODS: Long-term survival outcomes were investigated by analyzing data from patients enrolled in the feasibility study. Data from the feasibility study patients, and from patients eligible for the Z0011 strategy after its introduction into clinical practice, were subjected to multivariate logistic regression analysis to identify risk factors for axillary and locoregional recurrence. RESULTS: Regarding long-term outcomes for the feasibility study patients (n = 189), distant disease-free survival rates at 5 and 7 years were 90.4 ± 2.1% and 85.9 ± 2.6%, respectively, and overall survival rates at 5 and 7 years were 97.3 ± 1.2% and 95.3 ± 1.7%, respectively. Analysis of data from these patients plus the 93 who received Z0011 in clinical practice (total, n = 282) identified the following independent risk factors for axillary recurrence: absence of high axillary tangential irradiation (OR, 5.87 [95% CI, 1.09-31.35], p = 0.04) and number of positive sentinel lymph nodes (OR, 4.65 [95% CI, 1.11-19.48], p = 0.04). Only high Ki67 labeling index (OR, 5.92 [95% CI, 1.31-26.70], p = 0.02) was identified as an independent risk factor for locoregional recurrence. CONCLUSION: Long-term survival outcome results of the feasibility study show that the Z0011 strategy can be used to treat Japanese patients with early-stage breast cancer. Our findings regarding risk factors suggest that high axillary tangent irradiation is necessary for the prevention of axillary recurrence and that irradiation, including of the regional lymph nodes, should be considered, especially in patients with high Ki67 index values.

[A Case of Chronic Expanding Hematoma of the Lower Abdomen after Reconstruction of Deep Inferior Epigastric Perforator Flap for Breast Cancer].

A 49-year-old woman who had surgery for left breast cancer and subsequently underwent a two-stage deep inferior epigastric perforator(DIEP)flap reconstruction. One month postoperatively, she became aware of abdominal distention and visited a local hospital. CT scan revealed subcutaneous fluid accumulation with capsular formation in the lower abdomen. Imaging findings and physical examination showed no abdominal wall scar hernia. After multiple puncture aspirations, fluid accumulation was observed again, and the possibility of a chronic expanding hematoma was considered. Later, hematoma removal, including the capsules, was performed; pathological findings showed no evidence of malignancy. No fluid retention was observed postoperatively. In cases where imaging evaluation reveals hematoma formation with capsules, hematoma removal, including the capsules, should be performed to avert the possibility of a chronic expanding hematoma.

[Factors related to the awareness of hope at the end of life among older adults who attend community-based preventive services for long-term care].

INTRODUCTION: This study explored the factors related to awareness of hope at the end of life among older adults who attend community-based preventive services for long-term care. METHODS: Hope at the end of life was determined using a six-item questionnaire inquiring about topics such as "Medical hope when oral intake is not possible" and "Where they wanted to spend the end of their lives." A multiple logistic regression analysis was performed using the six items as dependent variables and hospitalization experience, end-of-life care experience, and one's view of life and death as independent variables. RESULTS: Data from 95 retrieved questionnaires were analyzed. The range of hope at the end of life was 14.7%-71.6% for each item. "Where they wanted to spend the end of their lives" was the most frequently considered topic among the respondents. "Medical hope when oral intake was not possible" was considered by 41.1% of respondents, and this topic was related to experience with hospitalization and end-of-life care as well as interest in death. CONCLUSION: Hospitalization experience, end-of-life care, and personal views on life and death were shown to be related to awareness of hope at the end of life among community-dwelling older adults.

Axillary management based on American college of surgeons oncology group Z0011 criteria makes it possible to omit intraoperative diagnosis of sentinel lymph nodes in early breast cancer patients.

The ACOSOG Z0011 trial has resulted in the omission of axillary lymph node dissection (ALND) in early breast cancer patients with one or two metastatic sentinel lymph nodes (SLNs). There has been increasing interest in the necessity of intraoperative assessment of SLNs in patients treated based on the Z0011 criteria. We evaluated the utility of intraoperative assessment in these eligible patients. A total of 1396 patients were treated following the Z0011 criteria from April 2012 to December 2019. We examined the proportion and clinicopathological features of patients who underwent ALND due to three or more metastatic SLNs and the sensitivity of intraoperative assessment. Only 16 (1.1%) patients had three or more metastatic SLNs diagnosed by intraoperative assessment, and they immediately underwent ALND. Of the clinicopathological factors, high clinical tumor stage (p = 0.002) and high Ki-67 labeling index value (p = 0.056) were more likely to be associated with the presence of three or more metastatic SLNs. The major independent risk factor for three or more metastatic SLNs was high clinical tumor stage (OR 3.94 [95% CI 1.42-11.0]; p = 0.009). Intraoperative assessment had low sensitivity (70.5%) and a high false-negative rate (29.5%) in detecting SLN metastases. The main finding of our study was the small proportion of patients who required ALND due to three or more metastatic SLNs according to the Z0011 criteria. The Z0011 strategy enables intraoperative assessment of SLNs to be omitted in early breast cancer patients.

[Primary Rhabdomyosarcoma of the Breast in a 16-Year-Old Girl].

We report a case of primary breast rhabdomyosarcoma. A 16-year-old girl noticed tumor of her right breast and consulted a local clinic. From the result of core needle biopsy, breast sarcoma was suspected, so she attended our hospital. Breast ultrasonography showed a mosaic pattern tumor occupying the whole right breast. CT images revealed an axillary node metastasis and no distant organ metastasis. Immunohistochemical staining of the tumor yielded positive results for desmin, MyoD1, and myogenin. Based on reverse transcription polymerase chain reaction(RT-PCR), she was diagnosed as an alveolar rhabdomyosarcoma with PAX3-FKHR(FOXO1)fusion transcripts[t(2;13)(q35;q14)]. She underwent total mastectomy and dissection of axillary lymph nodes. After surgery, the whole-body magnetic resonance imaging(MRI) demonstrated metastases of sacrum and left foot, so she was under systemic chemotherapy.

PUB4, a CERK1-Interacting Ubiquitin Ligase, Positively Regulates MAMP-Triggered Immunity in Arabidopsis.

Lysin motif (LysM) receptor-like kinase CERK1 is a co-receptor essential for plant immune responses against carbohydrate microbe-associated molecular patterns (MAMPs). Concerning the immediate downstream signaling components of CERK1, receptor-like cytoplasmic kinases such as PBL27 and other RLCK VII members have been reported to regulate immune responses positively. In this study, we report that a novel CERK1-interacting E3 ubiquitin ligase, PUB4, is also involved in the regulation of MAMP-triggered immune responses. Knockout of PUB4 resulted in the alteration of chitin-induced defense responses, indicating that PUB4 positively regulates reactive oxygen species generation and callose deposition but negatively regulates MAPK activation and defense gene expression. On the other hand, detailed analyses of a double knockout mutant of pub4 and sid2, a mutant of salicylic acid (SA) synthesis pathway, showed that the contradictory phenotype of the pub4 mutant was actually caused by abnormal accumulation of SA in this mutant and that PUB4 is a positive regulator of immune responses. The present and recent findings on the role of PUB4 indicate that PUB4 is a unique E3 ubiquitin ligase involved in the regulation of both plant immunity and growth/development.

Autophosphorylation of Specific Threonine and Tyrosine Residues in Arabidopsis CERK1 is Essential for the Activation of Chitin-Induced Immune Signaling.

Pattern recognition receptors on the plant cell surface mediate the recognition of microbe/damage-associated molecular patterns (MAMPs/DAMPs) and activate downstream immune signaling. Autophosphorylation of signaling receptor-like kinases is a critical event for the activation of downstream responses but the function of each phosphorylation site in the regulation of immune signaling is not well understood. In this study, 41 Ser/Thr/Tyr and 15 Ser/Thr residues were identified as in vitro and in vivo autophosphorylation sites of Arabidopsis CERK1, which is essential for chitin signaling. Comprehensive analysis of transgenic plants expressing mutated CERK1 genes for each phosphorylation site in the cerk1-2 background indicated that the phosphorylation of T479 in the activation segment and Y428 located upstream of the catalytic loop is important for the activation of chitin-triggered defense responses. Contribution of the phosphorylation of T573 to the chitin responses was also suggested. In vitro evaluation of kinase activities of mutated kinase domains indicated that the phosphorylation of T479 and T573 is directly involved in the regulation of kinase activity of CERK1 but the phosphorylation of Y428 regulates chitin signaling independently of the regulation of kinase activity. These results indicated that the phosphorylation of specific residues in the kinase domain contributes to the regulation of downstream signaling either through the regulation of kinase activity or the different mechanisms, e.g. regulation of protein-protein interactions.

Topical cholesterol treatment ameliorates hapten-evoked cutaneous hypersensitivity by sustaining expression of 11ß-HSD1 in epidermis.

Changes in the stratum corneum extracellular matrix impair epidermal barrier function and may cause dermatoses. The aim of this study was to examine the effect of exogenous cholesterol application on skin barrier function and cutaneous inflammation. Skin barrier-disrupted or hapten-stimulated mice were treated with topical cholesterol. The effect of topical cholesterol application on an oxazolone (OXA)-induced hypersensitivity reaction was evaluated. Topical application of cholesterol efficiently decreased transepidermal water loss in areas of barrier-disrupted skin and ameliorated OXA-induced cutaneous hypersensitivity. These favourable effects may have resulted from sustained expression of 11ß-hydroxysteroid dehydrogenase type 1 (11ß-HSD1) in the cholesterol-treated skin. As 11ß-HSD1 is known to produce active cortisol, topical cholesterol may attenuate contact hypersensitivity by normalizing secretion of hormonally active cortisol from the skin.

Artemin causes hypersensitivity to warm sensation, mimicking warmth-provoked pruritus in atopic dermatitis.

BACKGROUND: Itch impairs the quality of life for many patients with dermatoses, especially atopic dermatitis (AD), and is frequently induced by a warm environment. OBJECTIVE: To determine the mechanism underlying itch induction by warmth, we focused on artemin, a member of glial cell line-derived neurotrophic factors (GDNFs). METHODS: A gene array assay revealed that artemin was expressed in substance P-treated dermal fibroblasts. The expression of artemin in healthy and AD-lesional skin was evaluated with immunohistochemistry and in situ hybridization. The impact of fibroblast-derived artemin on the proliferation and morphology of neural cell was investigated in vitro. To confirm the involvement of artemin in skin sensibility, wild-type and GDNF family receptor α3 knockout mice were employed for sensory examination. RESULTS: Artemin-expressing fibroblasts accumulated in skin lesions of patients with AD. Artemin induced cell proliferation of a neuroblastoma cell line in vitro, and intradermal injection of artemin in mice resulted in peripheral nerve sprouting and thermal hyperalgesia. Artemin-treated mice demonstrated scratching behavior in a warm environment, but mice deficient for GDNF family receptor α3, a potent artemin receptor, did not show this behavior. Furthermore, the escaping response to heat stimulus was attenuated in GDNF family receptor α3 knockout mice, suggesting that artemin may contribute to sensitivity to heat. CONCLUSION: These data suggest that dermal fibroblasts secrete artemin in response to substance P, leading to abnormal peripheral innvervation and thermal hyperalgesia. We hypothesize that artemin lowers the threshold of temperature-dependent itch sensation and might therefore be a novel therapeutic target for treating pruritic skin disorders, including AD.

Decreased sudomotor function is involved in the formation of atopic eczema in the cubital fossa.

BACKGROUND: Eczema in the cubital fossa, which is susceptible to sweat, is frequently observed in atopic dermatitis (AD). However, there has been no direct evidence that sweating causes eczema in the cubital fossa. METHODS: To investigate this issue, axon reflex-mediated sweating volume (AXR) and skin barrier function in the cubital fossa were measured in subjects with AD and in healthy volunteers, and were applied to clinical feature of the cubital fossa. RESULTS: AXR in the cubital fossa decreased in AD subjects; it positively correlated only with water-holding capacity in healthy subjects but not in patients with in AD. Furthermore, AD subjects with lichenoid eczema and either prurigo or papules over the cubital fossa showed extremely decreased AXR. CONCLUSIONS: These results suggest that decreased sweating is a major source of water in the stratum corneum, and decreased sudomotor function may be involved in both the cause and aggravation of representative atopic eczema in the cubital fossa.

Predictive factors for response to neoadjuvant chemotherapy: inflammatory and immune markers in triple-negative breast cancer.

BACKGROUND: Tumor-infiltrating lymphocytes (TILs) predict response to neoadjuvant chemotherapy (NAC) in triple-negative breast cancer (TNBC) patients. However, the TIL level can be determined at a few facilities. By contrast, neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) are easily and objectively determined from the results of full blood counts. We conducted a retrospective study to investigate whether TILs, NLR, and PLR predict NAC efficacy and whether NLR and PLR could be surrogate markers for TILs in TNBC. METHODS: Of the 266 patients diagnosed with TNBC between 2013 and 2019, 66 who underwent radical surgery after sequential administration of anthracycline and taxane as NAC were included in the study. TILs, NLR, and PLR were evaluated as predictors of pathologic complete response (pCR) using cutoff values determined from receiver operating characteristic curves. RESULTS: The cutoff values of TILs, NLR, and PLR were 20%, 2.6, and 180, respectively. High TIL level was associated with low NLR (P = 0.01) and low PLR (P = 0.01). High TIL level (odds ratio [OR] 4.28 [95% CI 1.40-13.1]; P = 0.01), low NLR (OR 5.51 [95% CI 1.60-18.9]; P = 0.01), and low PLR (OR 3.29 [95% CI 1.13-9.57]; P = 0.03) were associated with pCR. Low NLR predicted pCR independently (OR 6.59 [95% CI 1.45-30.0]; P = 0.01). CONCLUSIONS: TILs, NLR, and PLR predicted NAC efficacy against TNBC. TIL level was associated with NLR and PLR. NLR was an independent predictive factor and may be a useful surrogate marker for TILs when predicting pCR.

Abnormal axon reflex-mediated sweating correlates with high state of anxiety in atopic dermatitis.

BACKGROUND: Sweating plays a key role in skin homeostasis, including antimicrobial and moisturizing effects, and regulation of skin surface pH. Impaired axon reflex-mediated (AXR) sweating has been observed in patients with atopic dermatitis (AD). However, the mechanism of such abnormal sudomotor axon reflex remains to be revealed. METHODS: To investigate this mechanism, sudomotor function was analyzed using a quantitative sudomotor axon reflex test (acetylcholine iontophoresis) in patients with AD (n = 26) and healthy volunteers (n = 12). Correlation between sudomotor function and certain background factors, including Spielberger State Trait Anxiety Inventory score, Severity Scoring of Atopic Dermatitis (SCORAD) score, number of circulating eosinophils, and serum concentrations of thymus and activation-regulated chemokine and immunoglobulin E radioimmunosorbent test, was validated. RESULTS: Latency time was significantly prolonged in AD (p = 0.0352), and AXR sweating volume (mg/0-5 min) was significantly lower in AD patients than in healthy controls (p = 0.0441). Direct sweating volume (mg/0-5 min) was comparable in AD patients and healthy controls. A significant correlation between the evaluation results of quantitative sudomotor axon reflex tests and certain background factors was not observed. The latency time in non-lesioned and lesioned areas for AD patients versus continuous anxiety value in the Spielberger State Trait Anxiety Inventory and the AXR versus SCORAD showed significant correlations (p = 0.0424, p = 0.0169, and p = 0.0523, respectively). CONCLUSIONS: Although the number of study subjects was little, abnormal AXR sweating in patients with AD was observed. Correlative analysis suggests possible involvement of continuous anxiety and the immune system in such abnormal sudomotor function.

A Comparison of the Oncological Outcomes After Breast-Conserving Surgery With or Without Latissimus Dorsi Myocutaneous Flap Reconstruction for Breast Cancer.

BACKGROUND: There is little information on the oncological outcomes of breast-conserving surgery (BCS) with immediate reconstruction using a latissimus dorsi myocutaneous flap (LDMF) for breast cancer compared with BCS alone. PATIENTS AND METHODS: We conducted a retrospective cohort study from a single institution comparing the margin positivity rates after initial surgery, re-excision rates, and local recurrence (LR) between BCS with immediate LDMF reconstruction (n = 145) and BCS alone (n = 1040) performed from 2012 to 2017 for newly diagnosed stage 0-3 breast cancer. RESULTS: The positive rates of surgical margin after initial surgery were significantly lower in the BCS with LDMF group than in the BCS alone group (4.1 vs. 10.8%; P = .006). There were no marked differences in the re-excision rates between the BCS with LDMF and BCS alone groups (P = .1). At a median follow-up of 61 months, the surgical method (BCS with LD vs. BCS alone) was not associated with the LR-free survival after adjusting for various clinicopathologic factors (P = .8). CONCLUSION: Our findings suggest that BCS with immediate LDMF reconstruction is oncologically safe for breast cancer compared with BCS alone. However, further studies are needed.

Pegfilgrastim-induced vasculitis of the subclavian and basilar artery complicated by subarachnoid hemorrhage in a breast cancer patient: a case report and review of the literature.

BACKGROUND: Pegfilgrastim (PEG) is a sustained-duration pegylated form of filgrastim, a granulocyte-colony stimulating factor agent that is widely used as prophylaxis against febrile neutropenia during chemotherapy. We report the case of a breast cancer patient who developed PEG-induced vasculitis complicated by subarachnoid hemorrhage (SAH) and review the relevant literature. CASE PRESENTATION: A 48-year-old woman had undergone surgery for breast cancer and was receiving docetaxel and cyclophosphamide as adjuvant chemotherapy (docetaxel 75 mg/m2, cyclophosphamide 600 mg/m2); on day 4 of treatment, PEG had been administered. On day 14, she was admitted to hospital with fever, general malaise, and neck pain, and her C-reactive protein level was found to be high (12.65 mg/dL). Although infection was initially suspected, antimicrobial treatment was ineffective and other laboratory test results were negative for this. Contrast-enhanced computed tomography on day 22 showed thickened vessel walls in the left subclavian artery, the origin of the common carotid artery, and the thoracoabdominal aorta. On day 26, magnetic resonance imaging of the head to investigate possible causes of headache showed signs consistent with SAH, and magnetic resonance angiography images showed irregularity in the basilar artery wall; the findings of both studies were considered to be due to PEG-induced vasculitis. Once treatment with prednisolone 40 mg/day had started, the wall thickening and irregularity improved. CONCLUSION: Although an uncommon adverse effect, vasculitis affecting vessels of various sizes may be caused by PEG. To the best of our knowledge, this report is the first to describe a case of G-CSF-induced vasculitis complicated by SAH. In cases of persistent high fever and elevated inflammatory response after PEG administration and in the absence of infection, clinicians should consider the possibility of drug-induced vasculitis.

Risk of Abemaciclib-induced Liver Injury in Hormone Receptor-positive, HER2-negative Metastatic Breast Cancer: A Retrospective Analysis.

BACKGROUND/AIM: The efficacy of endocrine therapy combined with abemaciclib for hormone receptor-positive, HER2-negative metastatic breast cancer has been established through pivotal clinical trials. However, abemaciclib-induced liver injury (AILI) can be a cause for dose reduction or discontinuation. Therefore, it is critical to understand the risk factors for AILI. PATIENTS AND METHODS: This retrospective study analyzed data from patients who had received abemaciclib combined with endocrine therapy for metastatic breast cancer as first- or second-line therapy at our hospital between December 2018 and October 2021. Relevant data were extracted from their medical records. Logistic regression analysis was performed to identify characteristics associated with AILI. RESULTS: Of the 52 eligible patients, 12 (23%) received an aromatase inhibitor (AI), and 40 (77%) received fulvestrant, concomitantly with abemaciclib. Fifteen (29%) of the patients developed liver injury after starting abemaciclib. Univariate analysis revealed the following risk factors for AILI: age ≥65 years (p=0.047), fatty liver disease (p=0.047), and concomitant use of an AI (p=0.002). Concomitant use of an AI was identified by multivariate analysis as an independent risk factor for AILI [odds ratio (OR)=10.23, 95% confidence interval (CI)=2.02-51.91, p=0.005]. CONCLUSION: Concomitant use of an AI could be the most significant factor associated with increased risk of AILI. Future research on the mechanism by which the use of an AI plus abemaciclib can cause liver injury, and prospective studies to validate our findings regarding AILI risk factors, are warranted.

Cedar pollen aggravates atopic dermatitis in childhood monozygotic twin patients with allergic rhino conjunctivitis.

We report a case of 7-year-old monozygotic twin patients with atopic dermatitis. The HLA haplotypes were HLA A2, A11, B27, B61, DR1, and DR4. Both serum IgE levels and cedar pollen radioallergosorbent test (RAST) scores were high in the twins (elder/younger sister: IgE: 5170/3980 IU/ml and Japansese cedar pollen: >100/64.0) in contrast to low mite and food RAST scores (Dermatophagoides Pterygonium; 0.59/0.4 and egg white 9.24/4.6). The patients showed positive immediate (20 min in both sisters) and delayed (24 hours in elder sister, 24, 48, 72 hours in younger sister) reactions to a scratch test with Japanese cedar pollen. Skin lesions on the face were aggravated and extended to the trunk and extremities during the Japanese cedar pollen season and gradually subsided in summer. Oral provocation with egg white or cow milk showed no exacerbations, and topical corticosteroid did not improve the eczema. In contrast, successful protection from severe scratching behaviors was achieved by use of topical anti-allergic eye drops and wearing nightgowns made by the mother.

Four cases of atopic dermatitis complicated by Sjögren's syndrome: link between dry skin and autoimmune anhidrosis.

We report four adult cases of atopic dermatitis (AD) complicated by Sjögren's syndrome (SS). The patients fulfilled diagnostic criteria for AD and SS. All cases showed persistent itchy dry skin and eczematous lesions complicated by sicca symptoms including dry eyes and dry mouth with moderate joint pain. One case manifested annular erythema and another manifested widespread discoid erythema. To investigate the underlying cause of dry skin in these cases, sweating function was evaluated using a quantitative sudomotor axon reflex test (QSART) in which the axon reflex is stimulated by acetylcholine iontophoresis. The sweating latency time was significantly prolonged in eczematous skin of AD and AD/SS compared to normal controls. Axon reflex (AXR) sweat volume was also significantly reduced in AD (normal and eczematous skin) and AD/SS (normal and eczema) compared to normal control. In contrast, the direct sweat volume of lesional or non-lesional AD skin induced by direct stimulation with acetylcholine was only slightly reduced compared to that in normal controls, but not in SS and lesional skin of AD/SS patients. These results suggest that the impaired sweat response in AD is attributable to an abnormal sudomotor axon reflex, which is accelerated and modulated when complicated by SS resulting in dry skin in the present cases.

Two cases of refractory discoid lupus erythematosus successfully treated with topical tocoretinate.

Discoid lupus erythematosus (DLE), the most common lupus erythematosus (LE)-specific chronic manifestation of the skin, is often resistant to therapy. Atrophy, scarring, and pigmentation are often observed. In this study, we report two cases of DLE that were successfully treated with tocoretinate, a compound containing a mixture of retinoic acid and tocopherol. Atrophy and pigmentation improved in both cases. The mechanism of action of tocoretinate is discussed.

A case of disseminated DLE complicated by atopic dermatitis and Sjögren's syndrome: link between hypohidrosis and skin manifestations.

We report an unusual case of disseminated discoid lupus erythematosus (DLE) complicated by pre-existing atopic dermatitis (AD) and late-onset Sjögren's syndrome (SS). Disseminated DLE lesions were sparse on the expected sites for AD, such as the medial region of the extremities or v-neck area. The patient fulfilled the diagnostic criteria for AD and SS but not for systemic lupus erythematosus. Histopathological analysis of the crusted erythematous lesions revealed typical DLE with few FoxP3(+) cells and a moderate number of IL-17(+) cells. A quantitative sweating test showed impaired sweating of both lesional and non-lesional skin due to underlying hypohidrosis that was related to AD and SS. This finding suggests that dissemination of DLE was triggered by scratching and a Köbner phenomenon-like effect related to hypohidrotic and xerotic skin. To the best of our knowledge, this is the first reported case of disseminated DLE complicated by AD and SS.

Prevalence of BRCA1 and BRCA2 mutations in Japanese patients with triple-negative breast cancer: A single institute retrospective study.

Numerous databases for risk assessment of BRCA1/2 gene mutations contain insufficient data about Asians. Furthermore, few studies have reported the prevalence of germline BRCA1/2 mutations in Japanese patients, particularly those with triple-negative breast cancer (TNBC). The present study was a retrospective analysis of data from patients with TNBC who underwent BRCA1/2 mutation testing at Osaka International Cancer Institute (Osaka, Japan) between October 2014 and March 2020. A total of 65 patients with TNBC underwent a test for BRCA1/2 mutations, and 13 (20.0%) had deleterious mutations in the BRCA1 or BRCA2 genes. Furthermore, 12 out of 29 patients with a family history of breast or ovarian cancer had deleterious BRCA1/2 mutations, and only 1 of 34 without a family history had a mutation (41.4 vs. 2.9%; P=0.014). No patients aged >60 years had BRCA1/2 mutations; however, the age of diagnosis was not a significant risk factor for BRCA1/2 mutations (P=0.60). The prevalence of BRCA1/2 mutations in the present cohort of Japanese patients with TNBC was slightly higher than those reported in other larger studies from Europe and North America. Further data from large prospective studies are required to more precisely define the prevalence of BRCA1/2 mutations.