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A. Koyama · SciRah

Researcher profile · Semantic Scholar

A. Koyama

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A. Koyama — researcher profile on SciRah

h-index: 19
Works: 77
Citations: 921

Most-cited papers

Health-related quality of life in breast cancer: A cross-cultural survey of German, Japanese, and South Korean patients
E. Shim, A. Mehnert, A. Koyama, Seong-Jin Cho +3 more
2006Breast Cancer Research and Treatment137 citations
Semantic Scholar
Discrimination between worry and anxiety among cancer patients: development of a brief cancer‐related worry inventory
Kei Hirai, M. Shiozaki, Hiroko Motooka, Hirokazu Arai +3 more
2008Psycho-Oncology57 citations
Semantic Scholar
Addressing long-acting reversible contraception access, bias, and coercion: supporting adolescent and young adult reproductive autonomy
Amanda E. Bryson, A. Koyama, Areej Hassan
2021Current opinion in pediatrics41 citations
Semantic Scholar
Additive Duloxetine for Cancer-related Neuropathic Pain Nonresponsive or Intolerant to Opioid-Pregabalin Therapy: A Randomized Controlled Trial (JORTC-PAL08).
H. Matsuoka, S. Iwase, T. Miyaji, T. Kawaguchi +20 more
2019Journal of Pain and Symptom Management41 citations Open access
Semantic Scholar
Emerging Options for Emergency Contraception
A. Koyama, Laura Hagopian, J. Linden
2013Clinical Medicine Insights: Reproductive Health41 citations Open access
Semantic Scholar
Gender differences in cancer-related distress in Japan: a retrospective observation study
A. Koyama, H. Matsuoka, Yoichi Ohtake, Chihiro Makimura +3 more
2016BioPsychoSocial Medicine40 citations Open access
Semantic Scholar
Global lessons on healthy adolescent sexual development
A. Koyama, H. Corliss, J. Santelli
2009Current opinion in pediatrics38 citations
Semantic Scholar
Kampo medicine for palliative care in Japan
Hirokuni Okumi, A. Koyama
2014BioPsychoSocial Medicine34 citations Open access
Semantic Scholar
Early palliative intervention for patients with advanced cancer.
Masatomo Otsuka, A. Koyama, H. Matsuoka, M. Niki +4 more
2013Japanese Journal of Clinical Oncology33 citations
Semantic Scholar
Pilot study of duloxetine for cancer patients with neuropathic pain non-responsive to pregabalin.
H. Matsuoka, Chihiro Makimura, A. Koyama, Masatomo Otsuka +5 more
2012Anticancer Research33 citations
Semantic Scholar
Expression changes in arrestin β 1 and genetic variation in catechol-O-methyltransferase are biomarkers for the response to morphine treatment in cancer patients.
H. Matsuoka, T. Arao, Chihiro Makimura, M. Takeda +13 more
2012Oncology Report32 citations
Semantic Scholar
Prospective study evaluating the plasma concentrations of twenty-six cytokines and response to morphine treatment in cancer patients.
Chihiro Makimura, T. Arao, H. Matsuoka, M. Takeda +12 more
2011Anticancer Research28 citations
Semantic Scholar
Advanced practice clinicians' interest in providing medical abortion: results of a California survey.
Ann C. Hwang, A. Koyama, Diana L. Taylor, Jillian T. Henderson +1 more
2005Perspectives on sexual and reproductive health27 citations
Semantic Scholar
Chemotherapeutic drugs that penetrate the blood–brain barrier affect the development of hyperactive delirium in cancer patients
H. Matsuoka, K. Yoshiuchi, A. Koyama, Masatomo Otsuka +1 more
2014Palliative & Supportive Care26 citations
Semantic Scholar
The effect of early puberty suppression on treatment options and outcomes in transgender patients
Leonidas Panagiotakopoulos, Veenod L. Chulani, A. Koyama, Krista Childress +3 more
2020Nature reviews. Urology24 citations
Semantic Scholar
Addressing the challenges of clinician training for long-acting reversible contraception.
Julia Potter, A. Koyama, M. Coles
2015JAMA pediatrics22 citations
Semantic Scholar
Regression of brain metastases from breast cancer with eribulin: a case report
H. Matsuoka, J. Tsurutani, J. Tanizaki, Tsutomu Iwasa +3 more
2013BMC Research Notes20 citations Open access
Semantic Scholar
Negative support of significant others affects psychological adjustment in breast cancer patients
M. Shiozaki, Kei Hirai, A. Koyama, H. Inui +2 more
2011Psychology and Health20 citations
Semantic Scholar
Prospective replication study implicates the catechol-O-methyltransferase Val158Met polymorphism as a biomarker for the response to morphine in patients with cancer.
H. Matsuoka, Chihiro Makimura, A. Koyama, Y. Fujita +5 more
2017Biomedical Reports19 citations Open access
Semantic Scholar
Expectation of a Decrease in Pain Affects the Prognosis of Pain in Cancer Patients: a Prospective Cohort Study of Response to Morphine
H. Matsuoka, K. Yoshiuchi, A. Koyama, Chihiro Makimura +6 more
2017International Journal of Behavioral Medicine18 citations Open access
Semantic Scholar
Study protocol for a multi-institutional, randomised, double-blinded, placebo-controlled phase III trial investigating additive efficacy of duloxetine for neuropathic cancer pain refractory to opioids and gabapentinoids: the DIRECT study
H. Matsuoka, H. Ishiki, S. Iwase, A. Koyama +7 more
2017BMJ Open16 citations Open access
Semantic Scholar
Predictors of duloxetine response in patients with neuropathic cancer pain: a secondary analysis of a randomized controlled trial—JORTC-PAL08 (DIRECT) study
H. Matsuoka, S. Iwase, T. Miyaji, T. Kawaguchi +21 more
2019Supportive Care in Cancer14 citations
Semantic Scholar
The physical and psychological problems of immigrants to Japan who require psychosomatic care: a retrospective observation study
A. Koyama, Hirokuni Okumi, H. Matsuoka, Chihiro Makimura +2 more
2016BioPsychoSocial Medicine14 citations Open access
Semantic Scholar
Identifying a Golden Opportunity: Adolescent Interest in Contraceptive Initiation in a Pediatric Emergency Department
Colleen K. Gutman, D. Dorfman, Halea Meese, P. Kavanagh +1 more
2020Journal of Women's Health12 citations Open access
Semantic Scholar
Selection of opioids for cancer-related pain using a biomarker: a randomized, multi-institutional, open-label trial (RELIEF study)
H. Matsuoka, J. Tsurutani, Yasutaka Chiba, Y. Fujita +7 more
2017BMC Cancer12 citations Open access
Semantic Scholar
Effective Therapy Against Severe Anxiety Caused by Cancer: A Case Report and Review of the Literature
Ryo Sakamoto, A. Koyama
2020Cureus11 citations Open access
Semantic Scholar
Missed Opportunities for Sexual History Documentation and Sexually Transmitted Infection Testing in the Pediatric Emergency Department.
Caryn Robertson, A. Thomas, A. Koyama, Lauren Middlebrooks +3 more
2021Journal of Adolescent Health10 citations
Semantic Scholar
The current clinical use of adjuvant analgesics for refractory cancer pain in Japan: a nationwide cross-sectional survey.
Keita Tagami, H. Matsuoka, K. Ariyoshi, S. Oyamada +4 more
2020Japanese Journal of Clinical Oncology8 citations
Semantic Scholar
Avoiding diagnostic errors in psychosomatic medicine: a case series study
A. Koyama, Yoichi Ohtake, Kanae Yasuda, K. Sakai +4 more
2018BioPsychoSocial Medicine8 citations Open access
Semantic Scholar
Novel single nucleotide polymorphism biomarkers to predict opioid effects for cancer pain
Y. Fujita, H. Matsuoka, Y. Chiba, J. Tsurutani +17 more
2023Oncology Letters7 citations Open access
Semantic Scholar
Morphine Versus Oxycodone for Cancer Pain Using a Catechol-O-methyltransferase Genotype Biomarker: A Multicenter, Randomized, Open-Label, Phase III Clinical Trial (RELIEF Study)
H. Matsuoka, J. Tsurutani, Y. Chiba, Y. Fujita +15 more
2022The Oncologist7 citations Open access
Semantic Scholar
Unique Needs for the Implementation of Emergency Department HIV Screening in Adolescents
Colleen K. Gutman, Elizabeth Duda, Naomi P. Newton, Ryan Alevy +9 more
2020Academic Emergency Medicine7 citations Open access
Semantic Scholar
Clinical outcome of node‐negative oligometastatic non–small cell lung cancer
K. Sakai, M. Takeda, H. Hayashi, Kaoru Tanaka +6 more
2016Thoracic Cancer7 citations Open access
Semantic Scholar
Phase III, international, multicentre, double-blind, dose increment, parallel-arm, randomised controlled trial of duloxetine versus pregabalin for opioid-unresponsive neuropathic cancer pain: a JORTC-PAL16 trial protocol
H. Matsuoka, Katherine Clark, B. Fazekas, S. Oyamada +19 more
2022BMJ Open6 citations Open access
Semantic Scholar
Updates on HIV nonoccupational postexposure prophylaxis.
A. Koyama, Lauren Middlebrooks, Adam Bullock
2019Current opinion in pediatrics6 citations
Semantic Scholar
Incidence of carnitine deficiency in patients with cancer pain: A pilot study
K. Sakai, H. Matsuoka, Yoichi Ohtake, Chihiro Makimura +7 more
2017Molecular and clinical oncology6 citations Open access
Semantic Scholar
Comparison of Targeted and Routine Adolescent HIV Screening in a Pediatric Emergency Department
Colleen K. Gutman, Naomi P. Newton, Elizabeth Duda, Ryan Alevy +8 more
2022Pediatric emergency care5 citations
Semantic Scholar
Psychological problems for non-Japanese speaking patients in Japan.
A. Koyama, M. Niki, H. Matsuoka, Ryo Sakamoto +3 more
2012Journal of Travel Medicine5 citations Open access
Semantic Scholar
Psychosocial effects of appearance changes due to cancer treatment and needs for information and supportive care in Japanese cancer patients
H. Sakai, A. Koyama, Kaoru Tanaka, S. Watanabe +5 more
2020Asia-Pacific Journal of Clinical Oncology4 citations
Semantic Scholar
Attitude of Japanese palliative care specialists towards adjuvant analgesics cancer-related neuropathic pain refractory to opioid therapy: a nationwide cross-sectional survey
H. Matsuoka, Keita Tagami, K. Ariyoshi, S. Oyamada +3 more
2019Japanese Journal of Clinical Oncology4 citations
Semantic Scholar
Long-Acting Reversible Contraception in the Pediatric Emergency Department: Clinical Implications and Common Challenges
A. Koyama, David H. Dorfman, M. Forcier
2015Pediatric emergency care3 citations
Semantic Scholar
Fentanyl Infusion Is Effective in the Treatment of Dyspnea in End-Stage Heart Failure With Renal Failure: A Case Report
Ryo Sakamoto, A. Koyama
2021Cureus2 citations Open access
Semantic Scholar
Abortion in Medical School Curricula
A. Koyama, Robin Williams
20202 citations Open access
Semantic Scholar
Clinical Response to Everolimus of EGFR–Mutation‐Positive NSCLC With Primary Resistance to EGFR TKIs
H. Matsuoka, H. Kaneda, K. Sakai, A. Koyama +2 more
2017Clinical Lung Cancer2 citations
Semantic Scholar
Regression of brain metastases from breast cancer with eribulin: a case report
H. Matsuoka, J. Tsurutani, J. Tanizaki, Tsutomu Iwasa +3 more
2013BMC Research Notes2 citations Open access
Semantic Scholar
[The role of psychosomatic medicine doctors in palliative care medicine--two case reports].
H. Matsuoka, Masatomo Otsuka, A. Koyama, Shigeru Hatabe +2 more
2010Gan to kagaku ryoho. Cancer & chemotherapy2 citations
Semantic Scholar
Efficacy of Comedy on Health-Related Quality of Life and Oxidative Stress in Cancer Survivors
Ryo Sakamoto, Yukariko Hida, M. Shiozaki, Hiroko Motooka +1 more
2023Cureus1 citations Open access
Semantic Scholar
Pediatric Emergency Medicine Fellowship Education on Adolescent Sexual Health Care
Emily Weber, Jennifer H. Chao, A. Koyama, R. Sinert
2022Pediatric emergency care1 citations
Semantic Scholar
Analysis of Various Factors Associated With Opioid Dose Escalation in Patients With Cancer Pain
Ryo Sakamoto, A. Koyama
2022Cureus1 citations Open access
Semantic Scholar
Identifying the Needs Based on the Patients’ Performance Status for Palliative Care Team: An Observational Study
Ryo Sakamoto, A. Koyama
2021Indian Journal of Palliative Care1 citations Open access
Semantic Scholar

Frequent co-authors

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H. Matsuoka×25
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H. Matsuoka — researcher profile on SciRah
K. Nakagawa×15
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K. Nakagawa — researcher profile on SciRah
K. Sakai×14
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K. Sakai — researcher profile on SciRah
Ryo Sakamoto×14
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Chihiro Makimura

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J. Tsurutani×11

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Masatomo Otsuka×9

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K. Nishio — researcher profile on SciRah

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Y. Fujita — researcher profile on SciRah

Yoichi Ohtake×7

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S. Oyamada — researcher profile on SciRah