Non-pharmacological treatments for anticipatory nausea and vomiting during chemotherapy: a systematic review and meta-analysis of the Clinical Practice Guidelines for Antiemesis 2023.

BACKGROUND: Anticipatory chemotherapy-induced nausea and vomiting (CINV) is a conditioned response influenced by the severity and duration of previous emetic responses to chemotherapy. We aimed to evaluate the efficacy of non-pharmacologic interventions for anticipatory CINV among patients with cancer. METHODS: We conducted a systematic search in databases, including PubMed, the Cochrane Library, CINAHL, and Ichushi-Web, from January 1, 1990, to December 31, 2020. Randomized controlled trials, non-randomized designs, observational studies, or case-control studies that utilized non-pharmacological therapies were included. The primary outcomes were anticipatory CINV, with an additional investigation into adverse events and the costs of therapies. The risk-of-bias for each study was assessed using the Cochrane risk-of-bias tool, and meta-analysis was performed using Revman 5.4 software. RESULTS: Of the 107 studies identified, six met the inclusion criteria. Three types of non-pharmacological treatments were identified: systematic desensitization (n = 2), hypnotherapy (n = 2), and yoga therapy (n = 2). Among them, systematic desensitization significantly improved anticipatory CINV as compared to that in the control group (nausea: risk ratio [RR] = 0.60, 95% confidence interval [CI] = 0.49-0.72, p < 0.00001; vomiting: RR = 0.54, 95% CI = 0.32-0.91, p = 0.02). However, heterogeneity in outcome measures precluded meta-analysis for hypnotherapy and yoga. Additionally, most selected studies had a high or unclear risk of bias, and adverse events were not consistently reported. CONCLUSIONS: Our findings suggest that systematic desensitization may effectively reduce anticipatory CINV. However, further research is warranted before implementation in clinical settings.

NECTIN2 is a prognostic biomarker and potential therapeutic target in lung adenocarcinoma.

INTRODUCTION: NECTINs are transmembrane proteins mediating cell-to-cell adhesion. NECTINs interact with integrins or other membrane receptors to trigger multiple cellular functions. Aberrant NECTIN expression is associated with cancer progression and poor outcomes. While NECTIN2 is overexpressed in various cancer types, its role in lung cancer is not well understood. MATERIAL AND METHODS: We investigated the function of NECTIN2 in lung adenocarcinoma (LUAD) using the Cancer Genome Atlas (TCGA) dataset and clinical samples of 105 LUAD patients who had undergone surgical resection. Cell proliferation, apoptosis, migration and invasion were investigated using human lung adenocarcinoma cell lines. RESULTS: We found that high NECTIN2 expression correlated with reduced overall survival in LUAD in TCGA database. In clinical samples, high NECTIN2 expression was associated with lower recurrence-free survival in all patients (P < 0.001) and in stage I patients (P = 0.001). Functional analyses demonstrated that NECTIN2 knockout promoted cell apoptosis and diminished cell proliferation and migration capacity. NECTIN2 overexpression did not significantly affect cellular functions. DISCUSSION: Our results suggest that NECTIN2 plays a significant role in cell apoptosis and cancer cell migration, leading to increased postoperative recurrence. Furthermore, NECTIN2 serves as a prognostic indicator and a potential therapeutic target in LUAD. CONCLUSIONS: High NECTIN2 expression in LUAD was found to be associated with postoperative recurrence, and was observed to play an important role in cell apoptosis and migration.

Selective elimination of tumorigenic cells from mixed culture of normal and tumorigenic cells using hybrid liposomes aimed at realizing of cell therapy.

While induced pluripotent stem (iPS) cells are expected to be a cell source for regenerative medicine, they also have tumorigenic properties owing to their proliferative potential. During the manufacturing of regenerative medicine products, undifferentiated iPS cells and malignant transformed cells may be mixed in the cell culture population. Therefore, it is essential to eliminate tumorigenic cells selectively. In this study, a mixed culture of normal human fetal hepatocytes (Hc cells) and human hepatocellular carcinoma cells (HuH-7 cells) was used as a cell population model to be used as regenerative medicine products, and the selective elimination of HuH-7 cells by hybrid liposomes (HL) was analyzed. HL tended to fuse and accumulate more in HuH-7 cells due to larger fluidity of plasma membrane for HuH-7 cells than that for Hc cells. In a mixed culture of Hc and HuH-7 cells, HL selectively eliminated HuH-7 cells while allowing Hc cells to remain viable. In addition, HL treatment for the mixed culture of Hc and HuH-7 cells suppressed the tumorigenicity of HuH-7 cells. Therefore, HL selectively fused and accumulated in tumorigenic cells in a mixed cell culture of normal and tumorigenic cells, and eliminated tumorigenic cells while allowing normal cells to remain viable. The results of this study suggest the potential of HL in eliminating tumorigenic cells during the manufacturing of regenerative medicine products. Thus, HL could be expected to contribute to the development of safe regenerative medical products. Supplementary Information: The online version contains supplementary material available at 10.1007/s10616-023-00613-y.

Characteristic hysteroscopy appearance considerations for detecting uterine endometrial malignancies.

AIM: The effectiveness of hysteroscopy in diagnosing endometrial lesions has been demonstrated, showing high diagnostic accuracy for malignant endometrial lesions. Although the characteristic appearances of atypical and malignant endometria have been reported, they are not definitive and sometimes complicated. This study aimed to identify a small number of characteristic features to detect endometrial abnormalities using a simple judgment system and analyze the diagnostic characteristics and their accuracy in endometrial malignancy diagnosis. METHODS: We performed a retrospective analysis of hysteroscopy video data of 250 patients, of which we selected for analysis based on pathology examination 152 cases with benign changes, 16 with atypical endometrium, and 18 with carcinoma in situ or endometrial cancer. Endometrial characteristics assessed included protrusion, desquamation, extended vessel, atypical vessel, and white/yellow lesion. RESULTS: Multivariable analysis revealed that desquamation (p = 0.001, odds ratio [OR] 5.28), atypical vessels (p < 0.001, OR 8.50), and white/yellow lesions (p = 0.011, OR 1.37) were significant predictors for endometrial malignancy. From their contribution status, scoring points of 4, 6, and 1 were settled according to the odds ratio proportions. When scores ≥5 (at least both desquamation and white/yellow lesions or only atypical vessels) were used to define endometrial malignancy, sensitivity and specificity were 100% and 92%, respectively. When detecting cancer, atypical, and benign cases, sensitivity and specificity were 88% and 90%, respectively. CONCLUSION: Our characteristics hysteroscopic findings showed a higher predictive ability in detecting endometrial malignancies. However, further examination with more cases would be needed to accurately diagnose endometrial malignancy by hysteroscopy.

Improvement in a post-stroke pediatric patient with hemiplegia: Use of a hand-arm bimanual intensive therapy with hybrid assistive limb.

BACKGROUND: Pediatric stroke is a rare medical condition that often leads to long-lasting motor and cognitive impairments. Although therapies for adults after a stroke are well described, treatments for motor deficits following a pediatric stroke are yet to be investigated. We report a case of pediatric stroke in the chronic phase, in which a combination of novel treatments resulted in a significant improvement in physical function. CASE REPORT: A seven-year-old girl with a left hemispheric cerebral infarction lost almost all right upper extremity motor function. Following onabotulinumtoxinA treatment, she underwent hand-arm bimanual intensive therapy augmented with a hybrid assistive limb for 90 h over 15 days. Evaluation after the training revealed significant improvements in physical function, daily activities, and occupational performance. CONCLUSIONS: This report highlights the importance of innovative combinations of techniques in the treatment of pediatric stroke.

Recurrent bicycle falls by an elderly man who developed multiple intramuscular abscesses associated with urine leakage secondary to posterior urethral injury caused by pelvic ring disruption.

Key Clinical Message: With the aging of the population, physicians need to pay more attention to assessing the presence or absence of pelvic fractures and urinary retention associated with urethral injury due to such fractures in the elderly when falling from bicycles. Abstract: Walking ability does not rule out the presence of pelvic fractures. Many geriatric patients are likely to fall off bicycles. Physicians should pay more attention when assessing complications related to urethral trauma caused by pelvic fractures in the elderly after falling from bicycles.

Integrin alpha 2 is associated with tumor progression and postoperative recurrence in non-small cell lung cancer.

BACKGROUND: Integrins are transmembrane proteins that mediate cell adhesion to extracellular matrix. Whereas expression of integrin alpha 2 is associated with motility, invasiveness and cellular differentiation in various tumors, the role of integrin alpha 2 in lung cancer has not been studied in detail. The aim of this study was to determine whether and how aberrant integrin alpha 2 expression in non-small cell lung cancer leads to different outcomes. METHODS: We measured expression of integrin alpha 2 by quantitative polymerase chain reaction in 100 samples collected from non-small cell lung cancer patients who had undergone surgical resection. We assigned patients to high and low expression groups and analyzed survival. Cellular morphology, adhesion, proliferation, migration and invasion were examined in human lung cancer cell lines. RESULTS: Among 100 cases, 41 were female, with a median age of 71 years. High expression of integrin alpha 2 in non-small cell lung cancer was associated with lower recurrence-free survival (P = 0.004). Overexpression of integrin alpha 2 in cell lines had no effect on cell proliferation or invasion but resulted in increased cell size (1416 µm2 versus 470 µm2 in H522 cells, P < 0.001; 1822 µm2 versus 1029 µm2 in H661 cells, P = 0.02), adhesion (P < 0.001 in H522 and H661 cells) and migration (gap area filled was 71% versus 36% in H522 cells, P < 0.001; 57% versus 26% in H661 cells, P = 0.001). These changes were suppressed by E7820, an inhibitor of integrin alpha 2. CONCLUSIONS: Integrin alpha 2 may play a significant role in lung cancer adhesion and migration, and may lead to a higher risk of recurrence.

The Histone Methyltransferase SETD8 Regulates the Expression of Tumor Suppressor Genes via H4K20 Methylation and the p53 Signaling Pathway in Endometrial Cancer Cells.

The histone methyltransferase SET domain-containing protein 8 (SETD8), which methylates histone H4 lysine 20 (H4K20) and non-histone proteins such as p53, plays key roles in human carcinogenesis. Our aim was to determine the involvement of SETD8 in endometrial cancer and its therapeutic potential and identify the downstream genes regulated by SETD8 via H4K20 methylation and the p53 signaling pathway. We examined the expression profile of SETD8 and evaluated whether SETD8 plays a critical role in the proliferation of endometrial cancer cells using small interfering RNAs (siRNAs). We identified the prognostically important genes regulated by SETD8 via H4K20 methylation and p53 signaling using chromatin immunoprecipitation sequencing, RNA sequencing, and machine learning. We confirmed that SETD8 expression was elevated in endometrial cancer tissues. Our in vitro results suggest that the suppression of SETD8 using siRNA or a selective inhibitor attenuated cell proliferation and promoted the apoptosis of endometrial cancer cells. In these cells, SETD8 regulates genes via H4K20 methylation and the p53 signaling pathway. We also identified the prognostically important genes related to apoptosis, such as those encoding KIAA1324 and TP73, in endometrial cancer. SETD8 is an important gene for carcinogenesis and progression of endometrial cancer via H4K20 methylation.

MED1, a novel binding partner of BRCA1, regulates homologous recombination and R-loop processing.

Homologous recombination (HR) is a major repair pathway of DNA double-strand breaks and is closely related to carcinogenesis. HR deficiency has been established as a therapeutic target. The aim of this study was to elucidate the functions of a novel HR factor, Mediator complex subunit 1 (MED1), and its association with BRCA1. Formation of the MED1/BRCA1 complex was examined by immunoprecipitation and GST-pull down assays. The transcription cofactor role of BRCA1 was evaluated using luciferase assays. The roles of MED1 on DNA damage response and HR were analyzed by immunofluorescence and HR assays. R-loop accumulation was analyzed using immunofluorescence. R-loop-induced DNA damage was analyzed by comet assays. Immunoprecipitation and GST-pull down assays demonstrated that MED1 is a novel binding partner of BRCA1 and binds to the BRCT domain. Luciferase assays showed that MED1 potentiated the transcription ability of BRCT by two-fold. In MED1-depleted cells, recruitment of HR genes, such as RPA and γH2AX, to DNA damage sites was severely impaired. HR assays showed that MED1 knockdown significantly decreased HR activity. R-loop nuclear accumulation and R-loop-induced comet tails were observed in MED1-depleted cells. We conclude that the transcription factor MED1 contributes to the regulation of the HR pathway and R-loop processing.

Manual vacuum aspiration (women's MVA) for endometrial biopsy for patients with suspected endometrial malignancies.

AIM: Endometrial biopsy is generally performed with a metal uterine curette sonde; however, recently, many types of vacuum aspirators are available, including the manual vacuum aspiration (MVA) system. We used the women's MVA system for endometrial sampling and evaluated its effectiveness in determining the presence of endometrial malignancy. METHODS: Forty-seven samples were examined using the following procedures after measuring endometrial thickness by transvaginal ultrasonography: fractional curettage biopsy (Bx; 20 samples), total curettage under general anesthesia (T/C; 13 samples), and MVA (14 samples). The quality of the endometrial samples was classified into four types: 1-4, where 1 denoted poor and 4, good quality. RESULTS: The mean score of the MVA group was significantly higher than that of the partial curettage biopsy group (p = 0.0065). No differences were observed between the MVA and total curettage groups (p = 1.00). When patients were divided into two groups according to endometrial thickness (<10 mm or ≥10 mm) and analyzed, both the MVA and T/C groups did not show a significant difference in their scores compared to the Bx group when the endometrial thickness was <10 mm. However, when the endometrial thickness was ≥10 mm, the MVA and T/C groups had significantly better scores than the Bx group (p = 0.0225 and p = 0.0244, respectively). Vagal reflex, as an adverse event, was observed only in two patients in the Bx group (2/20, 10%). CONCLUSION: Considering its quality and safety, Karman-type MVA for endometrial sampling could be an alternative to fractional curettage using a metallic uterine curette sonde.

Development of a national health policy logic model to accelerate the integration of oncology and palliative care: a nationwide Delphi survey in Japan.

BACKGROUND: Despite recommendations to deliver palliative care to cancer patients and their caregivers, their distress has not been alleviated satisfactorily. National health policies play a pivotal role in achieving a comprehensive range of quality palliative care delivery for the public. However, there is no standardised logic model to appraise the efficacy of these policies. This study aimed to develop a logic model of a national health policy to deliver cancer palliative care and to reach consensus towards specific policy proposals. METHODS: A draft version of the logic model and specific policy proposals were formulated by the research team and the internal expert panel, and the independent external expert panel evaluated the policy proposals based on the Delphi survey to reach consensus. RESULTS: The logic model was divided into three major conceptual categories: 'care-delivery at cancer hospitals', 'community care coordination', and 'social awareness of palliative care'. There were 18 and 45 major and minor policy proposals, which were categorised into four groups: requirement of government-designated cancer hospitals; financial support; Basic Plan to Promote Cancer Control Programs; and others. These policy proposals were independently evaluated by 64 external experts and the first to third Delphi round response rates were 96.9-98.4%. Finally, 47 policy proposals reached consensus. The priority of each proposal was evaluated within the four policy groups. CONCLUSIONS: A national health policy logic model was developed to accelerate the provision of cancer palliative care. Further research is warranted to verify the study design to investigate the efficacy of the logic model.

Lower dose of ethambutol may reduce ocular toxicity without radiological deterioration for Mycobacterium avium complex pulmonary disease.

BACKGROUND: Ethambutol ocular toxicity is a major problem during combination chemotherapy for Mycobacterium avium complex (MAC) pulmonary disease (MAC-PD) due to years-long therapy for MAC. OBJECTIVES: This study aimed to identify the lower dose of daily ethambutol that can reduce ocular toxicity. METHODS: We retrospectively reviewed the medical records of 312 patients who visited The University of Tokyo Hospital between January 2007 and December 2017 for nontuberculous mycobacterial pulmonary disease. Seventy-six patients with MAC-PD who were treated with combination chemotherapy for the first time were analyzed in this study. RESULTS: Ethambutol was discontinued because of visual symptoms in 13 patients (17%), 7 of whom were diagnosed with ethambutol ocular neuropathy. The dose per body weight was significantly higher in patients who developed ocular neuropathy than in those who did not (15.4 mg/kg/d vs. 12.5 mg/kg/d, respectively; p = 0.048). We assigned patients to higher or lower dose groups according to the median dose of 12.5 mg/kg/d. Although ocular neuropathy developed in 6 out of 38 patients in the higher dose group, ocular neuropathy developed in 1 out of 38 patients in the lower dose group (16% vs. 3%, respectively; p = 0.038). The failures of sputum culture conversion and radiological improvement were not significantly different between the two groups (p = 0.638 and 0.305, respectively). Macrolide resistance developed in one patient per group during follow-up (3% per group, p = 0.945). CONCLUSIONS: A lower dose of ethambutol may reduce ocular toxicity without radiological deterioration for pulmonary MAC infection.

Selective elimination of tumorigenic hepatic stem cells using hybrid liposomes.

To avoid the risk of tumorigenesis after cell transplantation, tumorigenic stem cells should be selectively eliminated from induced pluripotent cells, embryonic stem cells, and somatic stem cells. We previously reported the presence of tumorigenic stem cells in human fetal hepatocyte-induced hepatoblasts after sodium butyrate (SB) treatment. In this study, we aimed to investigate the selective elimination of tumorigenic stem cells in human hepatoblasts using hybrid liposomes (HLs) prepared by sonicating a mixture of 90 mol% l-α-dimyristoylphosphatidylcholine and 10 mol% polyoxyethylene (n) dodecyl ether (C12 (EO)n, n = 23) in a buffer solution. Flow cytometric analysis revealed that the number of hepatoblasts increased by around 12-18 times in SB-treated cells compared to non-treated cells. In the colony formation assay, colonies of tumorigenic stem cells were observed in a soft agar plate after SB treatment. HL treatment for 48 h resulted in a remarkable decrease in the number of colonies. HLs also induced apoptosis of tumorigenic stem cells by activating caspase-3. Flow cytometry showed a significant accumulation of HLs, including fluorescent lipids, in tumorigenic hepatic stem cells. The reappearance of tumorigenic stem cells was suppressed even in subsequent subcultures of HL-treated cells. High CYP3A4 activity was observed in a three-dimensional in vitro assay. These results suggest that HL treatment could specifically eliminate tumorigenic hepatic stem cells. Incubation with HLs can be an effective culture method to maintain the quality of stem cells and reduce the risk of tumorigenesis after cell transplantation.

Enhanced antitumor activity of combined lipid bubble ultrasound and anticancer drugs in gynecological cervical cancers.

Chemotherapy plays an important role in the treatment of patients with gynecological cancers. Delivering anticancer drugs effectively to tumor cells with just few side effects is key in cancer treatment. Lipid bubbles (LB) are compounds that increase the vascular permeability of the tumor under diagnostic ultrasound (US) exposure and enable the effective transport of drugs to tumor cells. The aim of our study was to establish a novel drug delivery technique for chemotherapy and to identify the most effective anticancer drugs for the bubble US-mediated drug delivery system (BUS-DDS) in gynecological cancer treatments. We constructed xenograft models using cervical cancer (HeLa) and uterine endometrial cancer (HEC1B) cell lines. Lipid bubbles were injected i.v., combined with either cisplatin (CDDP), pegylated liposomal doxorubicin (PLD), or bevacizumab, and US was applied to the tumor. We compared the enhanced chemotherapeutic effects of these drugs and determined the optimal drugs for BUS-DDS. Tumor volume reduction of HeLa and HEC1B xenografts following cisplatin treatment was significantly enhanced by BUS-DDS. Both CDDP and PLD significantly enhanced the antitumor effects of BUS-DDS in HeLa tumors; however, volume reduction by BUS-DDS was insignificant when combined with bevacizumab, a humanized anti-vascular endothelial growth factor mAb. The BUS-DDS did not cause any severe adverse events and significantly enhanced the antitumor effects of cytotoxic drugs. The effects of bevacizumab, which were not as dose-dependent as those of the two drugs used prior, were minimal. Our data suggest that BUS-DDS technology might help achieve "reinforced targeting" in the treatment of gynecological cancers.

Automated system for diagnosing endometrial cancer by adopting deep-learning technology in hysteroscopy.

Endometrial cancer is a ubiquitous gynecological disease with increasing global incidence. Therefore, despite the lack of an established screening technique to date, early diagnosis of endometrial cancer assumes critical importance. This paper presents an artificial-intelligence-based system to detect the regions affected by endometrial cancer automatically from hysteroscopic images. In this study, 177 patients (60 with normal endometrium, 21 with uterine myoma, 60 with endometrial polyp, 15 with atypical endometrial hyperplasia, and 21 with endometrial cancer) with a history of hysteroscopy were recruited. Machine-learning techniques based on three popular deep neural network models were employed, and a continuity-analysis method was developed to enhance the accuracy of cancer diagnosis. Finally, we investigated if the accuracy could be improved by combining all the trained models. The results reveal that the diagnosis accuracy was approximately 80% (78.91-80.93%) when using the standard method, and it increased to 89% (83.94-89.13%) and exceeded 90% (i.e., 90.29%) when employing the proposed continuity analysis and combining the three neural networks, respectively. The corresponding sensitivity and specificity equaled 91.66% and 89.36%, respectively. These findings demonstrate the proposed method to be sufficient to facilitate timely diagnosis of endometrial cancer in the near future.

Molecular mechanism underlying the selective attack of trehalose lipids on cancer cells as revealed by coarse-grained molecular dynamics simulations.

The present study indicated that the mixed lipid bilayer of dimyristoylphosphatidylcholine (DMPC) and trehalosemonomyristate (TreC14) interacted strongly with the plasma membrane of cancer cells, and not that of normal cells, when the composition of TreC14 was 70%, as revealed by coarse-grained molecular dynamics simulations. These results were consistent with those of previous experimental studies, indicating that DMPC/TreC14 mixed liposomes (DMTreC14) with TreC14 composition at 70% exhibited a strong anti-cancer effect without affecting normal cells. The simulations also revealed that lipids with highly hydrophilic and bulky head groups, such as TreC14, phosphatidylinositol (PI), and phosphatidylserine (PS), showed the tendency to accumulate. This caused both the DMTreC14 and cancer cell membranes to bend into large positive curvatures, resulting in tight contact between them. In contrast, no apparent interaction between the DMTreC14 and normal cell membranes was observed because PI and PS did not exist in the extracellular monolayer of the normal cell membrane.

NRXN1 as a novel potential target of antibody-drug conjugates for small cell lung cancer.

Small cell lung cancer (SCLC) is a high-grade malignancy, and treatment strategies have not changed for decades. In this study, we searched for novel targets for antibody-drug conjugate (ADC) therapy for SCLC. We identified transmembrane proteins overexpressed specifically in SCLC with little or no expression in normal tissues and decided to focus on the cell adhesion molecule neurexin-1 (NRXN1). The cell surface overexpression of NRXN1 was confirmed using flow cytometry in SCLC cell lines (SHP77 and NCI-H526). The combination of a primary anti-NRXN1 monoclonal antibody and a secondary ADC exhibited anti-tumor activity in SCLC cell lines. Moreover, the knockout of NRXN1 in SHP77 cells resulted in a loss of the anti-tumor activity of NRXN1-mediated ADC therapy. Thus, NRXN1 could be a novel target for ADC therapy for the treatment of SCLC that is worth further research.

Trehalose liposomes induce apoptosis of breast tumor cells in vitro and in vivo.

The inhibitory effects of trehalose liposomes (TL) comprising l-α-dimyristoylphosphatidylcholine (DMPC) and α-D-glucopyranosyl-α-D-glucopyranoside monomyritate (TreC14) were investigated on breast cancer MDA-MB-453 cells in vitro and in vivo. The IC50 values of TL for MDA-MB-453 cells were remarkably lower than those of DMPC liposomes. The inhibitory effects of TL on the proliferation of MDA-MB-453 cells mediated via apoptosis induction were observed following their accumulation on MDA-MB-453 cell membranes. The membrane fluidity of MDA-MB-453 cells increased after TL treatment, as evident from a fluorescence depolarization assay. TL induced the apoptosis of MDA-MB-453 cells through caspase activation and mitochondrial membrane potential reduction, and suppressed the nuclear factor kappa B activity. A remarkable reduction in tumor volume was observed in a human breast cancer mouse model topically treated with TL. Induction of apoptosis was evident in TL-treated breast cancer tumors of mice using the TUNEL assay.

Desensitization strategy for hypersensitivity reactions to carboplatin in five patients with gynecological cancer.

AIM: Carboplatin is a key drug for gynecologic cancers. However, hypersensitivity reactions (HSR) are major adverse effects that might necessitate carboplatin discontinuation. Desensitization is an effective method in patients who developed initial HSR and further required carboplatin treatment. Here, we aimed to evaluate our experience with the use of the carboplatin desensitization protocol in five patients at the University of Tokyo Hospital. METHODS: We established a four-step, 5-h desensitization protocol for our hospital. Observational and retrospective analyses were performed. Additionally, we have shared the patients' clinical information with the emergency department to ensure the safety of this protocol. RESULTS: Five patients with recurrent gynecological cancer were treated using this protocol. Four of the five patients were treated effectively and 28 of 29 desensitization protocols were completed successfully. In one patient, we switched to olaparib successfully after two courses of our protocol. One patient who developed grade 4 HSR during initial carboplatin administration developed grade 2 HSR and we discontinued the protocol. CONCLUSION: The carboplatin desensitization protocol is very efficient. The outcome of our protocol was on a par with other protocols. To the best of our knowledge, this is the first study to indicate that switching to olaparib can be considered a suitable option in patients who develop HSR to carboplatin.