1.Study Protocol of Expanded Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro-EXP)
Jae Hoon MOON ; Eun Kyung LEE ; Wonjae CHA ; Young Jun CHAI ; Sun Wook CHO ; June Young CHOI ; Sung Yong CHOI ; A Jung CHU ; Eun-Jae CHUNG ; Yul HWANGBO ; Woo-Jin JEONG ; Yuh-Seog JUNG ; Kyungsik KIM ; Min Joo KIM ; Su-jin KIM ; Woochul KIM ; Yoo Hyung KIM ; Chang Yoon LEE ; Ji Ye LEE ; Kyu Eun LEE ; Young Ki LEE ; Hunjong LIM ; Do Joon PARK ; Sue K. PARK ; Chang Hwan RYU ; Junsun RYU ; Jungirl SEOK ; Young Shin SONG ; Ka Hee YI ; Hyeong Won YU ; Eleanor WHITE ; Katerina MASTROCOSTAS ; Roderick J. CLIFTON-BLIGH ; Anthony GLOVER ; Matti L. GILD ; Ji-hoon KIM ; Young Joo PARK
Endocrinology and Metabolism 2025;40(2):236-246
Background:
Active surveillance (AS) has emerged as a viable management strategy for low-risk papillary thyroid microcarcinoma (PTMC), following pioneering trials at Kuma Hospital and the Cancer Institute Hospital in Japan. Numerous prospective cohort studies have since validated AS as a management option for low-risk PTMC, leading to its inclusion in thyroid cancer guidelines across various countries. From 2016 to 2020, the Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro) enrolled 1,177 patients, providing comprehensive data on PTMC progression, sonographic predictors of progression, quality of life, surgical outcomes, and cost-effectiveness when comparing AS to immediate surgery. The second phase of MAeSTro (MAeSTro-EXP) expands AS to low-risk papillary thyroid carcinoma (PTC) tumors larger than 1 cm, driven by the hypothesis that overall risk assessment outweighs absolute tumor size in surgical decision-making.
Methods:
This protocol aims to address whether limiting AS to tumors smaller than 1 cm may result in unnecessary surgeries for low-risk PTCs detected during their rapid initial growth phase. By expanding the AS criteria to include tumors up to 1.5 cm, while simultaneously refining and standardizing the criteria for risk assessment and disease progression, we aim to minimize overtreatment and maintain rigorous monitoring to improve patient outcomes.
Conclusion
This study will contribute to optimizing AS guidelines and enhance our understanding of the natural course and appropriate management of low-risk PTCs. Additionally, MAeSTro-EXP involves a multinational collaboration between South Korea and Australia. This cross-country study aims to identify cultural and racial differences in the management of low-risk PTC, thereby enriching the global understanding of AS practices and their applicability across diverse populations.
2.Study Protocol of Expanded Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro-EXP)
Jae Hoon MOON ; Eun Kyung LEE ; Wonjae CHA ; Young Jun CHAI ; Sun Wook CHO ; June Young CHOI ; Sung Yong CHOI ; A Jung CHU ; Eun-Jae CHUNG ; Yul HWANGBO ; Woo-Jin JEONG ; Yuh-Seog JUNG ; Kyungsik KIM ; Min Joo KIM ; Su-jin KIM ; Woochul KIM ; Yoo Hyung KIM ; Chang Yoon LEE ; Ji Ye LEE ; Kyu Eun LEE ; Young Ki LEE ; Hunjong LIM ; Do Joon PARK ; Sue K. PARK ; Chang Hwan RYU ; Junsun RYU ; Jungirl SEOK ; Young Shin SONG ; Ka Hee YI ; Hyeong Won YU ; Eleanor WHITE ; Katerina MASTROCOSTAS ; Roderick J. CLIFTON-BLIGH ; Anthony GLOVER ; Matti L. GILD ; Ji-hoon KIM ; Young Joo PARK
Endocrinology and Metabolism 2025;40(2):236-246
Background:
Active surveillance (AS) has emerged as a viable management strategy for low-risk papillary thyroid microcarcinoma (PTMC), following pioneering trials at Kuma Hospital and the Cancer Institute Hospital in Japan. Numerous prospective cohort studies have since validated AS as a management option for low-risk PTMC, leading to its inclusion in thyroid cancer guidelines across various countries. From 2016 to 2020, the Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro) enrolled 1,177 patients, providing comprehensive data on PTMC progression, sonographic predictors of progression, quality of life, surgical outcomes, and cost-effectiveness when comparing AS to immediate surgery. The second phase of MAeSTro (MAeSTro-EXP) expands AS to low-risk papillary thyroid carcinoma (PTC) tumors larger than 1 cm, driven by the hypothesis that overall risk assessment outweighs absolute tumor size in surgical decision-making.
Methods:
This protocol aims to address whether limiting AS to tumors smaller than 1 cm may result in unnecessary surgeries for low-risk PTCs detected during their rapid initial growth phase. By expanding the AS criteria to include tumors up to 1.5 cm, while simultaneously refining and standardizing the criteria for risk assessment and disease progression, we aim to minimize overtreatment and maintain rigorous monitoring to improve patient outcomes.
Conclusion
This study will contribute to optimizing AS guidelines and enhance our understanding of the natural course and appropriate management of low-risk PTCs. Additionally, MAeSTro-EXP involves a multinational collaboration between South Korea and Australia. This cross-country study aims to identify cultural and racial differences in the management of low-risk PTC, thereby enriching the global understanding of AS practices and their applicability across diverse populations.
3.Study Protocol of Expanded Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro-EXP)
Jae Hoon MOON ; Eun Kyung LEE ; Wonjae CHA ; Young Jun CHAI ; Sun Wook CHO ; June Young CHOI ; Sung Yong CHOI ; A Jung CHU ; Eun-Jae CHUNG ; Yul HWANGBO ; Woo-Jin JEONG ; Yuh-Seog JUNG ; Kyungsik KIM ; Min Joo KIM ; Su-jin KIM ; Woochul KIM ; Yoo Hyung KIM ; Chang Yoon LEE ; Ji Ye LEE ; Kyu Eun LEE ; Young Ki LEE ; Hunjong LIM ; Do Joon PARK ; Sue K. PARK ; Chang Hwan RYU ; Junsun RYU ; Jungirl SEOK ; Young Shin SONG ; Ka Hee YI ; Hyeong Won YU ; Eleanor WHITE ; Katerina MASTROCOSTAS ; Roderick J. CLIFTON-BLIGH ; Anthony GLOVER ; Matti L. GILD ; Ji-hoon KIM ; Young Joo PARK
Endocrinology and Metabolism 2025;40(2):236-246
Background:
Active surveillance (AS) has emerged as a viable management strategy for low-risk papillary thyroid microcarcinoma (PTMC), following pioneering trials at Kuma Hospital and the Cancer Institute Hospital in Japan. Numerous prospective cohort studies have since validated AS as a management option for low-risk PTMC, leading to its inclusion in thyroid cancer guidelines across various countries. From 2016 to 2020, the Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro) enrolled 1,177 patients, providing comprehensive data on PTMC progression, sonographic predictors of progression, quality of life, surgical outcomes, and cost-effectiveness when comparing AS to immediate surgery. The second phase of MAeSTro (MAeSTro-EXP) expands AS to low-risk papillary thyroid carcinoma (PTC) tumors larger than 1 cm, driven by the hypothesis that overall risk assessment outweighs absolute tumor size in surgical decision-making.
Methods:
This protocol aims to address whether limiting AS to tumors smaller than 1 cm may result in unnecessary surgeries for low-risk PTCs detected during their rapid initial growth phase. By expanding the AS criteria to include tumors up to 1.5 cm, while simultaneously refining and standardizing the criteria for risk assessment and disease progression, we aim to minimize overtreatment and maintain rigorous monitoring to improve patient outcomes.
Conclusion
This study will contribute to optimizing AS guidelines and enhance our understanding of the natural course and appropriate management of low-risk PTCs. Additionally, MAeSTro-EXP involves a multinational collaboration between South Korea and Australia. This cross-country study aims to identify cultural and racial differences in the management of low-risk PTC, thereby enriching the global understanding of AS practices and their applicability across diverse populations.
4.Study Protocol of Expanded Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro-EXP)
Jae Hoon MOON ; Eun Kyung LEE ; Wonjae CHA ; Young Jun CHAI ; Sun Wook CHO ; June Young CHOI ; Sung Yong CHOI ; A Jung CHU ; Eun-Jae CHUNG ; Yul HWANGBO ; Woo-Jin JEONG ; Yuh-Seog JUNG ; Kyungsik KIM ; Min Joo KIM ; Su-jin KIM ; Woochul KIM ; Yoo Hyung KIM ; Chang Yoon LEE ; Ji Ye LEE ; Kyu Eun LEE ; Young Ki LEE ; Hunjong LIM ; Do Joon PARK ; Sue K. PARK ; Chang Hwan RYU ; Junsun RYU ; Jungirl SEOK ; Young Shin SONG ; Ka Hee YI ; Hyeong Won YU ; Eleanor WHITE ; Katerina MASTROCOSTAS ; Roderick J. CLIFTON-BLIGH ; Anthony GLOVER ; Matti L. GILD ; Ji-hoon KIM ; Young Joo PARK
Endocrinology and Metabolism 2025;40(2):236-246
Background:
Active surveillance (AS) has emerged as a viable management strategy for low-risk papillary thyroid microcarcinoma (PTMC), following pioneering trials at Kuma Hospital and the Cancer Institute Hospital in Japan. Numerous prospective cohort studies have since validated AS as a management option for low-risk PTMC, leading to its inclusion in thyroid cancer guidelines across various countries. From 2016 to 2020, the Multicenter Prospective Cohort Study of Active Surveillance on Papillary Thyroid Microcarcinoma (MAeSTro) enrolled 1,177 patients, providing comprehensive data on PTMC progression, sonographic predictors of progression, quality of life, surgical outcomes, and cost-effectiveness when comparing AS to immediate surgery. The second phase of MAeSTro (MAeSTro-EXP) expands AS to low-risk papillary thyroid carcinoma (PTC) tumors larger than 1 cm, driven by the hypothesis that overall risk assessment outweighs absolute tumor size in surgical decision-making.
Methods:
This protocol aims to address whether limiting AS to tumors smaller than 1 cm may result in unnecessary surgeries for low-risk PTCs detected during their rapid initial growth phase. By expanding the AS criteria to include tumors up to 1.5 cm, while simultaneously refining and standardizing the criteria for risk assessment and disease progression, we aim to minimize overtreatment and maintain rigorous monitoring to improve patient outcomes.
Conclusion
This study will contribute to optimizing AS guidelines and enhance our understanding of the natural course and appropriate management of low-risk PTCs. Additionally, MAeSTro-EXP involves a multinational collaboration between South Korea and Australia. This cross-country study aims to identify cultural and racial differences in the management of low-risk PTC, thereby enriching the global understanding of AS practices and their applicability across diverse populations.
5.Closure of Large Tracheocutaneous Fistula With Island Deltopectoral Flap
Hye-Bin JANG ; In Seok KANG ; Hyeong Seok LEE ; Joon Kyoo LEE
Korean Journal of Otolaryngology - Head and Neck Surgery 2024;67(8):462-466
Tracheocutaneous fistula (TCF) formation is a complication of long-term tracheostomy use. Surgical closure is necessary for a persistent TCF because this can lead to various complications. Herein, we describe our use of an island deltopectoral (DP) flap to treat a large TCF. A 62-year-old male, who had previously undergone supraglottic partial laryngectomy with laser and radiation therapy, presented with a second recurrence of supraglottic cancer. Supracricoid partial laryngectomy and cricohyoidoepiglottopexy (CHEP) were performed. Afterward, a large TCF measuring about 2.0×2.5 cm developed. The island DP flap facilitated successful TCF closure. There have been no recurrences or complications, and both the reconstruction site and donor site are well-maintained after 25 months of follow-up. The island DP flap can be a useful option for large TCF closure, even for patients who have had previous radiation therapy.
6.Closure of Large Tracheocutaneous Fistula With Island Deltopectoral Flap
Hye-Bin JANG ; In Seok KANG ; Hyeong Seok LEE ; Joon Kyoo LEE
Korean Journal of Otolaryngology - Head and Neck Surgery 2024;67(8):462-466
Tracheocutaneous fistula (TCF) formation is a complication of long-term tracheostomy use. Surgical closure is necessary for a persistent TCF because this can lead to various complications. Herein, we describe our use of an island deltopectoral (DP) flap to treat a large TCF. A 62-year-old male, who had previously undergone supraglottic partial laryngectomy with laser and radiation therapy, presented with a second recurrence of supraglottic cancer. Supracricoid partial laryngectomy and cricohyoidoepiglottopexy (CHEP) were performed. Afterward, a large TCF measuring about 2.0×2.5 cm developed. The island DP flap facilitated successful TCF closure. There have been no recurrences or complications, and both the reconstruction site and donor site are well-maintained after 25 months of follow-up. The island DP flap can be a useful option for large TCF closure, even for patients who have had previous radiation therapy.
7.Closure of Large Tracheocutaneous Fistula With Island Deltopectoral Flap
Hye-Bin JANG ; In Seok KANG ; Hyeong Seok LEE ; Joon Kyoo LEE
Korean Journal of Otolaryngology - Head and Neck Surgery 2024;67(8):462-466
Tracheocutaneous fistula (TCF) formation is a complication of long-term tracheostomy use. Surgical closure is necessary for a persistent TCF because this can lead to various complications. Herein, we describe our use of an island deltopectoral (DP) flap to treat a large TCF. A 62-year-old male, who had previously undergone supraglottic partial laryngectomy with laser and radiation therapy, presented with a second recurrence of supraglottic cancer. Supracricoid partial laryngectomy and cricohyoidoepiglottopexy (CHEP) were performed. Afterward, a large TCF measuring about 2.0×2.5 cm developed. The island DP flap facilitated successful TCF closure. There have been no recurrences or complications, and both the reconstruction site and donor site are well-maintained after 25 months of follow-up. The island DP flap can be a useful option for large TCF closure, even for patients who have had previous radiation therapy.
8.Closure of Large Tracheocutaneous Fistula With Island Deltopectoral Flap
Hye-Bin JANG ; In Seok KANG ; Hyeong Seok LEE ; Joon Kyoo LEE
Korean Journal of Otolaryngology - Head and Neck Surgery 2024;67(8):462-466
Tracheocutaneous fistula (TCF) formation is a complication of long-term tracheostomy use. Surgical closure is necessary for a persistent TCF because this can lead to various complications. Herein, we describe our use of an island deltopectoral (DP) flap to treat a large TCF. A 62-year-old male, who had previously undergone supraglottic partial laryngectomy with laser and radiation therapy, presented with a second recurrence of supraglottic cancer. Supracricoid partial laryngectomy and cricohyoidoepiglottopexy (CHEP) were performed. Afterward, a large TCF measuring about 2.0×2.5 cm developed. The island DP flap facilitated successful TCF closure. There have been no recurrences or complications, and both the reconstruction site and donor site are well-maintained after 25 months of follow-up. The island DP flap can be a useful option for large TCF closure, even for patients who have had previous radiation therapy.
9.Rehabilitation using milled-bar with attachment maxilla overdenture in a patient with peri-implantitis fixed prosthesis: A case report
Joon-Myung LEE ; So-Yeun KIM ; Du-Hyeong LEE ; Kyu-Bok LEE ; Cheong-Hee LEE
The Journal of Korean Academy of Prosthodontics 2024;62(2):123-130
There are various methods for restoring the dentition of completely edentulous patients. Removable complete dentures have the advantage of being relatively economical, but they can be uncomfortable to wear. With the introduction of implant prosthodontics, various options such as implant-supported overdentures and hybrid prostheses have become available. If there is inadequate remaining ridge or limited financial resources, an overdenture supported by a few implants with additional attachments may be more suitable. In this case, due to severe peri-implantitis and other complications, the implants were removed. Subsequently, four implants (two on each side) were placed in the maxilla and a milledbar with attachment was fabricated for each side of the maxilla.
10.Closure of Large Tracheocutaneous Fistula With Island Deltopectoral Flap
Hye-Bin JANG ; In Seok KANG ; Hyeong Seok LEE ; Joon Kyoo LEE
Korean Journal of Otolaryngology - Head and Neck Surgery 2024;67(8):462-466
Tracheocutaneous fistula (TCF) formation is a complication of long-term tracheostomy use. Surgical closure is necessary for a persistent TCF because this can lead to various complications. Herein, we describe our use of an island deltopectoral (DP) flap to treat a large TCF. A 62-year-old male, who had previously undergone supraglottic partial laryngectomy with laser and radiation therapy, presented with a second recurrence of supraglottic cancer. Supracricoid partial laryngectomy and cricohyoidoepiglottopexy (CHEP) were performed. Afterward, a large TCF measuring about 2.0×2.5 cm developed. The island DP flap facilitated successful TCF closure. There have been no recurrences or complications, and both the reconstruction site and donor site are well-maintained after 25 months of follow-up. The island DP flap can be a useful option for large TCF closure, even for patients who have had previous radiation therapy.

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