Takashi Iwata

Dr. Takashi Iwata

Department of Obstetrics and Gynecology, Keio University School of Medicine, Tokyo, Japan
orcid

Research Focus & Metrics

Academic Career Length

32Years (1995-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 November 2020 in Gynecologic Oncology
Verified
Journal Article
Closed access
AOAkiko Ohno
Akiko Ohno
TITakashi Iwata
Takashi Iwata
YKYuki Katoh
Yuki Katoh
STShiho Taniguchi
Shiho Taniguchi
KTKohsei Tanaka
Kohsei Tanaka
DADaisuke Aoki
Daisuke Aoki

1 November 2019 in Gynecologic Oncology
Verified
Journal Article
Closed access
NHNobumaru Hirao
Nobumaru Hirao
TITakashi Iwata
Takashi Iwata
KTKohsei Tanaka
Kohsei Tanaka
HNHiroshi Nishio
Hiroshi Nishio
MNMasaru Nakamura
Masaru Nakamura
YKYutaka Kawakami
Yutaka Kawakami

23 November 2019 in Gynecologic Oncology
Verified
Journal Article
Closed access
HMHiroko Machida
Hiroko Machida
TITakashi Iwata
Takashi Iwata
KOKaoru Okugawa
Kaoru Okugawa
KMKoji Matsuo
Koji Matsuo
TSTsuyoshi Saito
Tsuyoshi Saito
MMMikio Mikami
Mikio Mikami

19 August 2020 in Cancer Medicine
Verified
Journal Article
Open access
PDF file
KSKeiko Saotome
Keiko Saotome
TCTatsuyuki Chiyoda
Tatsuyuki Chiyoda
EAEriko Aimono
Eriko Aimono
KNKohei Nakamura
Kohei Nakamura
STShigeki Tanishima
Shigeki Tanishima
DADaisuke Aoki
Daisuke Aoki
Precision medicine based on cancer genomics is being applied in clinical practice. However, patients do not always derive benefits from genomic testing. Here, we performed targeted amplicon exome sequencing‐based panel tests, including 160 cancer‐related genes (PleSSision‐160), on 88 malignant ovarian tumors (high‐grade serous carcinoma, 27; endometrioid carcinoma, 15; clear cell carcinoma, 30; mucinous carcinoma, 6; undifferentiated carcinoma, 4; and others, 6 (immature teratoma, 1; carcinosarcoma, 3; squamous cell carcinoma, 1; and mixed, 1)), to assess treatment strategies and useful biomarkers for malignant ovarian tumors. Overall, actionable gene variants were found in 90.9%, and druggable gene variants were found in 40.9% of the cases. ActionableBRCA1andBRCA2variants were found in 4.5% of each of the cases.ERBB2amplification was found in 33.3% of mucinous carcinoma cases. Druggable hypermutation/ultramutation (tumor mutation burden ≥ 10 SNVs/Mbp) was found in 7.4% of high‐grade serous carcinoma, 46.7% of endometrioid carcinoma, 10% of clear cell carcinoma, 0% of mucinous carcinoma, 25% of undifferentiated carcinoma, and 33.3% of the other cancer cases. Copy number alterations were significantly higher in high‐grade serous carcinoma (P < .005) than in other histologic subtypes; some clear cell carcinoma showed high copy number alterations that were correlated with advanced stage (P < .05) and worse survival (P < .01). A high count of copy number alteration was associated with worse survival in all malignant ovarian tumors (P < .05). Our study shows that targeted agents can be detected in approximately 40% of malignant ovarian tumors via multigene panel testing, and copy number alteration count can be a useful marker to help assess risks in malignant ovarian tumor patients.

1 March 2014 in International Journal of Clinical Oncology
Verified
Journal Article
Closed access
PDF file
TITakashi Iwata
Takashi Iwata
TFTakuma Fujii
Takuma Fujii
KMKenji Morii
Kenji Morii
MSMiyuki Saito
Miyuki Saito
JSJuri Sugiyama
Juri Sugiyama
DADaisuke Aoki
Daisuke Aoki

1 January 2014 in Cancer Nursing
Verified
Journal Article
Closed access
HKHiroko Komatsu
Hiroko Komatsu
KYKaori Yagasaki
Kaori Yagasaki
RSRie Shoda
Rie Shoda
YCYounghui Chung
Younghui Chung
TITakashi Iwata
Takashi Iwata
TFTakuma Fujii
Takuma Fujii
Background: Fertility preservation is important for women of reproductive age with cervical cancer. The underlying reasons behind suboptimal reproductive results after successful fertility-preserving surgery have not yet been fully revealed. Objective: The objective of this study was to explore the experience of fertility preservation with radical trachelectomy from the perspective of women with cervical cancer. Methods: We conducted interviews with women with cervical cancer who underwent radical trachelectomy using a Grounded Theory methodology with a theoretical framework of symbolic interactionism. Results: Our findings articulate a process in which feminine identity is first threatened by a diagnosis of cancer, then repaired by fertility preservation with radical trachelectomy, and finally reconstructed after the surgery, through interactions with self, others, and external events in women with cervical cancer. Feeling incomplete as a woman because of the loss of the uterus was a critical factor in the women’s feeling that their feminine identity was threatened. Thus, fertility preservation was significant for these women. The meaning of fertility preservation varied among the women, and their life perspectives were therefore distinct after the surgery. Conclusions: Women with cervical cancer who undergo radical trachelectomy experience an identity transformation process, and child bearing is not the only expected outcome of fertility preservation. Implications for Practice: Nurses should coordinate care through the cancer trajectory. Understanding the identity transformation process helps nurses to assess patients’ needs and provide appropriate individual care.