Abstract
Background
Given the emerging evidence supporting the lack of prognostic significance of gross extrathyroidal extension invading only strap muscles (strap-gETE), this study investigated whether lobectomy is feasible for patients with strap-gETE.
Methods
A retrospective cohort study was conducted with 636 patients who had 1- to 4-cm-sized papillary thyroid carcinoma (PTC) treated with thyroid lobectomy. Patients with gross invasion of perithyroidal organs other than strap muscles or synchronous distant metastasis were excluded from the study. Disease-free survival (DFS) was compared according to the presence of strap-gETE.
Results
Strap-gETE was present in 50 patients (7.9%), with the remaining 586 patients (92.1%) showing no evidence of gETE. During the median follow-up period of 7.4 years, 6% of the patients with strap-gETE and 5.1% of the patients without gETE experienced structural persistent/recurrent disease (p = 0.99). No differences in DFS were observed between the two groups (hazard ratio [HR], 1.24; 95% confidence interval [CI], 0.38–4.08; p = 0.720). After adjustment for five major risk factors (age, gender, tumor size, multifocality, and cervical lymph node metastasis status) in the multivariate analysis, the presence of strap-gETE did not exhibit an independent role in the development of structural persistent/recurrent disease (HR 1.05; 95% CI 0.24–4.53, p = 0.950).
Conclusions
Strap-gETE did not increase the risk of structural persistent/recurrent disease for the patients who underwent lobectomy for 1- to 4-cm-sized PTC. The study data support the limited role of strap-gETE in clinical outcomes and may broaden the indications for lobectomy for patients with PTCs.
Similar content being viewed by others
References
American Joint Committee on Cancer. Thyroid gland. In: Fleming ID, Cooper JS, Henson DE, et al., editors. AJCC manual for staging of cancer. 5th ed. Philadelphia: Lippincott-Raven; 1997, p. 59–64.
Gemsenjager E, Heitz PU, Seifert B, Martina B, Schweizer I. Differentiated thyroid carcinoma: follow-up of 264 patients from one institution for up to 25 years. Swiss Med Wkly. 2001;131:157–63.
Ito Y, Tomoda C, Uruno T, et al. Prognostic significance of extrathyroid extension of papillary thyroid carcinoma: massive but not minimal extension affects the relapse-free survival. World J Surg. 2006;30:780–6.
Greene FL, Page DL, Fleming ID, et al. AJCC cancer staging manual. 6th ed. Philadelphia: Springer; 2002.
Tuttle MR, Morris LF, Haugen BR, et al. Thyroid-differentiated and anaplastic carcinoma. In: Amin MB, Edge SB, Greeme FL, et al., editors. AJCC cancer staging manual. 8th ed. Philadelphia: Springer; 2017, p. 873–890.
Arora N, Turbendian HK, Scognamiglio T, et al. Extrathyroidal extension is not all equal: implications of macroscopic versus microscopic extent in papillary thyroid carcinoma. Surgery. 2008;144:942–7; (discussion 947–948).
Shin JH, Ha TK, Park HK, et al. Implication of minimal extrathyroidal extension as a prognostic factor in papillary thyroid carcinoma. Int J Surg. 2013;11:944–7.
Radowsky JS, Howard RS, Burch HB, Stojadinovic A. Impact of degree of extrathyroidal extension of disease on papillary thyroid cancer outcome. Thyroid. 2014;24:241–4.
McCaffrey TV, Bergstralh EJ, Hay ID. Locally invasive papillary thyroid carcinoma: 1940–1990. Head Neck. 1994;16:165–72.
Iniguez-Ariza NM, Brito JP. Management of low-risk papillary thyroid cancer. Endocrinol Metab Seoul. 2018;33:185–94.
Park SY, Kim HI, Kim JH, et al. Prognostic significance of gross extrathyroidal extension invading only strap muscles in differentiated thyroid carcinoma. Br J Surg. 2018;105:1155–62.
Amit M, Boonsripitayanon M, Goepfert RP, et al. Extrathyroidal extension: does strap muscle invasion alone influence recurrence and survival in patients with differentiated thyroid cancer? Ann Surg Oncol. 2018;25:3380–8.
Song E, Lee YM, Oh HS, et al. A relook at the T stage of differentiated thyroid carcinoma with a focus on gross extrathyroidal extension. Thyroid. 2019;29:202–8.
Haugen BR, Alexander EK, Bible KC, et al. 2015 American Thyroid Association management guidelines for adult patients with thyroid nodules and differentiated thyroid cancer: the American Thyroid Association guidelines task force on thyroid nodules and differentiated thyroid cancer. Thyroid. 2016;26:1–133.
Jukkola A, Bloigu R, Ebeling T, Salmela P, Blanco G. Prognostic factors in differentiated thyroid carcinomas and their implications for current staging classifications. Endocr Relat Cancer. 2004;11:571–9.
Kwon H, Jeon MJ, Kim WG, et al. A comparison of lobectomy and total thyroidectomy in patients with papillary thyroid microcarcinoma: a retrospective individual risk factor-matched cohort study. Eur J Endocrinol. 2017;176:371–8.
Sung TY, Cho JW, Lee YM, et al. Dynamic risk stratification in stage I papillary thyroid cancer patients younger than 45 years of age. Thyroid. 2017;27:1400–7.
Song E, Oh HS, Jeon MJ, et al. The value of preoperative antithyroidperoxidase antibody as a novel predictor of recurrence in papillary thyroid carcinoma. Int J Cancer. 2019;144:1414–20.
Kim BW, Yousman W, Wong WX, Cheng C, McAninch EA. Less is more: comparing the 2015 and 2009 American Thyroid Association guidelines for thyroid nodules and cancer. Thyroid. 2016;26:759–64.
Schlumberger M, Leboulleux S, Catargi B, et al. Outcome after ablation in patients with low-risk thyroid cancer (ESTIMABL1): 5-year follow-up results of a randomised phase 3 equivalence trial. Lancet Diabetes Endocrinol. 2018;6:618–26.
Kandil E, Krishnan B, Noureldine SI, Yao L, Tufano RP. Hemithyroidectomy: a meta-analysis of postoperative need for hormone replacement and complications. ORL J Otorhinolaryngol Relat Spec. 2013;75:6–17.
Hauch A, Al-Qurayshi Z, Randolph G, Kandil E. Total thyroidectomy is associated with increased risk of complications for low- and high-volume surgeons. Ann Surg Oncol. 2014;21:3844–52.
Park S, Jeon MJ, Song E, et al. Clinical features of early and late postoperative hypothyroidism after lobectomy. J Clin Endocrinol Metab. 2017;102:1317–24.
Tam S, Boonsripitayanon M, Amit M, et al. Survival in differentiated thyroid cancer: comparing the AJCC Cancer Staging Seventh and Eighth Editions. Thyroid. 2018;28:1301–10.
Amit M, Boonsripitayanon M, Zafereo ME. ASO author reflections: strap muscle invasion does not influence recurrence and survival in patients with differentiated thyroid cancer. Ann Surg Oncol. 2018;25:892–93.
Acknowledgment
This study was supported by a Grant (No. 2018-790) from the Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea.
Author information
Authors and Affiliations
Corresponding authors
Ethics declarations
Conflict of interest
There are no conflicts of interest.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Electronic supplementary material
Below is the link to the electronic supplementary material.
Rights and permissions
About this article
Cite this article
Song, E., Kim, W.W., Jeon, M.J. et al. Clinical Significance of Gross Invasion of Strap Muscles in Patients With 1- to 4-cm-Sized Papillary Thyroid Carcinoma Undergoing Lobectomy. Ann Surg Oncol 26, 4466–4471 (2019). https://doi.org/10.1245/s10434-019-07778-x
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1245/s10434-019-07778-x