Outcomes of primary and secondary tracheoesophageal puncture: a 16-year retrospective analysis.Abstract The current study retrospectively reviewed the cases of 68 patients who had undergone total laryngectomy total laryngectomy Surgical oncology The complete excision of the larynx for invasive CA, which is performed when the lesions cannot be removed by a more conservative–hemilaryngectomy, subtotal laryngectomy procedure. See Laryngectomy. and tracheoesophageal tracheoesophageal /tra·cheo·esoph·a·ge·al/ (tra?ke-o-e-sof?ah-je´al) pertaining to the trachea and esophagus. tra·che·o·e·soph·a·ge·al adj. Of or relating to the trachea and the esophagus. puncture (TEP TEP Tucson Electric Power TEP Tomographie par Emission de Positons (French: Nuclear medicine imaging) TEP Technical Evaluation Panel TEP The English Patient (movie) TEP Transportation Enhancement Program ) over a 16-year period. Fifty-one patients underwent primary TEP and 17 underwent secondary TEP. Nearly 80% of patients who received TEP at the time of laryngectomy Laryngectomy Definition Laryngectomy is the partial or complete surgical removal of the larynx, usually as a treatment for cancer of the larynx. Purpose Normally a laryngectomy is performed to remove tumors or cancerous tissue. achieved excellent voice quality perceptually. In contrast, only 50% of secondary TEP patients achieved excellent voice ratings. This difference was statistically robust (p = 0.03). Although both surgical and prosthesis-related complications occurred more frequently following primary TEP, statistically significant differences were not achieved. Neither pre- nor postoperative post·op·er·a·tive adj. Happening or done after a surgical operation. postoperative after a surgical operation. postoperative care radiotherapy had any effect on voice restoration or complication rates. Based on these data, primary TEP may be preferable for several reasons, including a greater likelihood of successful voice restoration, a shorter duration of postoperative aphonia aphonia /apho·nia/ (a-fo´ne-ah) loss of voice; inability to produce vocal sounds. a·pho·ni·a n. , and the elimination of the need for a second operation and interim tube feedings Tube Feedings Definition Nutrients, either a special liquid formula or pureed food, are delivered to a patient through a tube directly into the gastrointestinal tract, usually into the stomach or small intestine. . Introduction In 1980, Singer and Blom popularized tracheoesophageal puncture (TEP) as a technique for voice restoration following total laryngectomy. (1,2) In that study, 88% of patients successfully attained functional voice following total laryngectomy. In addition, few complications were observed. Although TEP remains a popular means of voice restoration, no consensus exists as to the appropriate timing of TEP--that is, should it be performed during the total laryngectomy or later as a secondary procedure? The lack of consensus can be attributed to a paucity of data regarding the actual quality of voice restoration and the complications associated with the two procedures. The obvious advantage of primary TEP placement is that patients are not subjected to a second operation for the acquisition of voice. In addition, patients do not require nasogastric feedings following laryngectomy, and they may initiate voice rehabilitation rehabilitation: see physical therapy. within 2 weeks of the laryngectomy. (1) On the other hand, primary TEP is thought to be associated with an increased risk of surgical and stoma-related complications, such as fistula fistula (fĭs`ch lə), abnormal, usually ulcerous channellike formation between two internal organs or between an internal organ and the skin. , leakage at the puncture site, stomal
stenosis stenosis /ste·no·sis/ (ste-no´sis) pl. steno´ses [Gr.] stricture; an abnormal narrowing or contraction of a duct or canal. , and local infection. It has been suggested that the
complication rate may be decreased if TEP is performed as a secondary
procedure due to increased duration of tracheostomal healing. (1)
Moreover, secondary TEP patients may have more reasonable expectations
regarding the quality of tracheoesophageal speech and therefore be more
satisfied with their voice following the period of postoperative
aphonia. (3)In order to empirically address this issue, voice outcomes and complication rates were analyzed retrospectively in a relatively large cohort of patients who had undergone total laryngectomy and either primary or secondary TEE Patients and methods The current study was approved by the Institutional Review Board at Memorial Sloan-Kettering Cancer Center The Memorial Sloan-Kettering Cancer Center (MSKCC) in New York City is a cancer treatment and research institution founded in 1884 as the New York Cancer Hospital. The main campus is located at 1275 York Avenue, between 67th and 68th Streets, with other locations in New . Medical records of all patients who had undergone laryngectomy and TEP from 1987 through 2002 were reviewed to determine the incidence and nature of successful voice acquisition and any complications associated with either the surgical procedure or the prosthesis prosthesis (prŏs`thĭsĭs): see artificial limb. prosthesis Artificial substitute for a missing part of the body, usually an arm or leg. . Voice quality. The quality of the post-TEP voice was evaluated perceptually by a speech pathologist on the basis of a conversational speech sample. During the evaluation, phonation pho·na·tion n. The utterance of sounds through the use of the vocal cords; vocalization. pho na·to was adequate with
minimal leakage around the tracheostoma using digital occlusion occlusion /oc·clu·sion/ (o-kloo´zhun)1. obstruction. 2. the trapping of a liquid or gas within cavities in a solid or on its surface. 3. . TEP voices were classified as excellent, fair, or poor, based primarily on vocal duration, continuity, fluency, and vocal loudness during conversational speech. Although not psychometrically sound, this perceptual scale is employed commonly in clinical practice. In addition, the success of TEP was assessed by ascertaining the percentage of patients who consistently used the prosthesis as the primary mode of communication. Surgical complications. Surgical complications of interest were the development of fistula, stomal stenosis, and pharyngoesophageal stricture stricture /stric·ture/ (strik´chur) stenosis. stric·ture n. A circumscribed narrowing of a hollow structure. . Prosthesis-related complications. Prosthesis-related complications were defined as those that necessitated intervention--particularly, dislodgment dislodgment, n the movement or removal of a prosthesis from its established position. and leakage. The latter was defined as leakage through the prosthesis within 3 months of its placement or leakage around the prosthesis, which indicated that either the health of the tissue was poor or the sizing of the prosthesis was unsatisfactory. When complications occurred, interventions included, but were not limited to, resizing the prosthesis, dilating the esophagus esophagus (ĭsŏf`əgəs), portion of the digestive tube that conducts food from the mouth to the stomach. When food is swallowed it passes from the pharynx into the esophagus, initiating rhythmic contractions (peristalsis) of the , cauterizing granulation tissue Granulation tissue A kind of tissue formed during wound healing, with a rough or irregular surface and a rich supply of blood capillaries. Mentioned in: Granuloma Inguinale granulation tissue, n , and administering antifungal antifungal /an·ti·fun·gal/ (-fung´gal) 1. destructive to fungi, or suppressing their reproduction or growth; effective against fungal infections. 2. an agent that so acts. rinses. Radiation. As a secondary aim of the current investigation, the relationship between radiation therapy and voice acquisition, surgical complications, and prosthesis-related complications was determined. Statistical analyses. Fisher's exact test Fisher's exact test a statistical test for association in a two-by-two table based on the exact hypergeometric distribution of the frequencies within the table. was employed in the current study. The investigation-wide alpha-level was set at 0.05. Results A total of 68 patients were identified and included in the current study (table). The median patient age at presentation was 59 years (range: 31 to 82). The male-to-female ratio was approximately 4:1. Of the 68 patients, 51 (75.0%) had undergone primary TEP and 17 (25.0%) had undergone secondary TEP. In the primary TEP group, primary closure of the pharyngeal pharyngeal /pha·ryn·ge·al/ (fah-rin´je-al) pertaining to the pharynx. pha·ryn·geal or pha·ryn·gal adj. Of, relating to, located in, or coming from the pharynx. defect was achieved in 42 patients; 5 patients required a pectoralis major pec·to·ral·is major n. A muscle with origin from the clavicle, the anterior surface of the episternum, the sternum, the cartilages of the first to the sixth ribs, and the aponeurosis of the external oblique abdominal muscle; with insertion into the myocutaneous flap, 3 required a jejunal jejunal /je·ju·nal/ (je-joo´n'l) pertaining to the jejunum. je·ju·nal adj. Relating to the jejunum. jejunal pertaining to the jejunum.j. free flap free flap n. An island flap in which the donor vessels are severed and the flap is moved to the recipient site where it is revascularized. Free flap , and 1 required both. In the secondary group, primary closure was achieved in 13 patients, while 3 patients required closure with a pectoralis flap and 1 required a jejunal free flap. The median length of time between laryngectomy and secondary TEP was 23 months. Approximately half of these patients had elected to undergo secondary TEP because they had experienced only minimal success with esophageal speech esophageal speech n. A technique for speaking after total laryngectomy involving the swallowing of air and its subsequent expulsion to produce a vibration in the hypopharynx. ; most of the others cited displeasure with electrolaryngeal speech as their motivation. Voice quality. Perceptual evaluations of voice quality were available for only 50 of the 68 patients--36 in the primary group and 14 in the secondary group (table). Excellent voice quality was achieved by 28 of the primary TEP patients (77.8%) and 7 of the secondary patients (50.0%); the difference between the two groups was statistically significant (p = 0.03). Of the remaining primary TEP patients, 5 had a fair voice (13.9%) and 3 had a poor voice (8.3%). Of the secondary TEP patients, 5 had a fair voice (35.7%) and 2 had a poor voice (14.3%). Following TEE only 52 of the 68 patients (76.5%) used tracheoesophageal speech as their primary mode of communication--40 of the 51 patients in the primary group (78.4%) and 12 of the 17 in the secondary group (70.6%). Tracheoesophageal speech was abandoned completely by 1 primary patient and 2 secondary patients. Surgical complications. In the group as a whole, surgical complications occurred in 27 of 68 patients (39.7%) (table). When analyzed by subgroup, surgical complications occurred in 22 of the 51 primary TEP patients (43.1%) and in 5 of the 17 secondary TEP patients (29.4%). The difference between the two rates was not statistically significant (p = 0.40). In the primary group, there were 10 cases of fistula, 10 cases of stomal stenosis, and 6 pharyngoesophageal strictures (some patients in both groups experienced multiple complications). Surgical complications in the secondary group included 3 fistulas, 3 stomal stenoses, and 1 pharyngoesophageal stricture. Prosthesis-related complications. Prosthesis-related complications occurred in 29 of the 68 patients (42.6%)--in 24 primary patients (47.1%) and 5 secondary patients (29.4%) (table). The difference was not statistically significant (p = 0.26). In the primary group, the most common complications were prosthesis leakage, which occurred in 20 patients (39.2%), and dislodgement dis·lodge v. dis·lodged, dis·lodg·ing, dis·lodg·es v.tr. To remove or force out from a position or dwelling previously occupied. v.intr. , which occurred in 6 (11.8%). Likewise, leakage was the most common complication in the secondary group, occurring in 4 patients (23.5%); only 1 case of dislodgment (5.9%) was noted in the secondary group. Radiation. In the primary TEP group, 30 patients underwent preoperative pre·op·er·a·tive adj. Preceding a surgical operation. preoperative preceding an operation. preoperative care the preparation of a patient before operation. radiation with or without chemotherapy and 19 received postoperative radiation; 5 of these patients received both (table). Seven patients did not receive any radiotherapy. In the secondary TEP cohort, 7 patients underwent preoperative radiation treatment with or without chemotherapy and 7 received postoperative radiation; 2 of these patients received radiotherapy both before and after laryngectomy (table). Five patients in the secondary TEP group did not receive any radiotherapy. Post hoc post hoc adv. & adj. In or of the form of an argument in which one event is asserted to be the cause of a later event simply by virtue of having happened earlier: analyses suggest that radiation therapy (before and/or after laryngectomy) had no impact on voice acquisition, surgical complications, or prosthesis-related complications (figure). Discussion Previously published direct comparisons of primary and secondary TEP have shown that the two procedures were equally successful in restoring voice. (1-12) Studies focusing on primary TEP yielded success rates ranging from 52 to 89%. (1-14) Reported success rates for secondary TEP range from 56 to 94%. (2,7,9,13-20) One exception was a series reported by Trudeau et al, who found that 27% of secondary TEP patients remained permanently aphonic aphonic 1. pertaining to aphonia. 2. without audible sound. while 100% of primary TEP patients regained speech. (10) Another notable finding was reported by Recher et al, who demonstrated an excellent success rate (91%) among patients who underwent secondary TEP electively; these patients performed significantly better than a subgroup of patients who underwent secondary TEP after they had already failed to achieve esophageal speech (64%). (21) Donegan et al identified several factors that contribute to voice acquisition difficulties, including patients' inability to care for the prostheses Prostheses A synthetic object that resembles a missing anatomical part. Mentioned in: Microphthalmia and Anophthalmia . (22) The success rates in the current investigation were similar to those reported previously. Among the primary TEP patients, 77.8% achieved excellent voice quality and 78.4% used tracheoesophageal speech consistently. In the secondary TEP cohort, the corresponding rates were 50.0 and 70.6%. The difference between the rates of excellent voice quality in the two groups was statistically significant (p = 0.03). This finding provides surgeons with valuable data for consideration during treatment planning In radiotherapy, Treatment Planning is the process in which a team consisting of radiation oncologists, medical radiation physicists and dosimetrists plan the appropriate external beam radiotherapy treatment technique for a patient with cancer. Typically, medical imaging (i.e. . In addition to voice acquisition, surgical complications must be considered. In their original series, Singer et al suggested that complications of TEP are uncommon. (2) However, conflicting data exist. For example, Maniglia et al reported that TEP was associated with significant complication rates regardless of its timing. (8) In that study, complications occurred in 36% of primary TEP patients and 21% of secondary TEP patients, although most of those complications were transient and easily managed. Similarly, Mehle et al reported that 23% of secondary TEP patients experienced a major complication associated with the surgical procedure. (23) Ho et al initially found that primary TEP patients may experience higher rates of stomal stenosis than do secondary TEP patients. (17) However, when they performed a subsequent multivariate analysis multivariate analysis, n a statistical approach used to evaluate multiple variables. multivariate analysis, n a set of techniques used when variation in several variables has to be studied simultaneously. , they found that primary TEP was not an independent risk factor for tracheostomal stenosis. Risk factors that have been reported to predispose pre·dis·pose v. To make susceptible, as to a disease. patients to complications include radiotherapy, chronic obstructive pulmonary disease chronic obstructive pulmonary disease n. Abbr. COPD A chronic lung disease, such as asthma or emphysema, in which breathing becomes slowed or forced. , and an extended laryngectomy. Complications that occur during the immediate postoperative period have been associated with a need for stricture dilation dilation /di·la·tion/ (di-la´shun) 1. the act of dilating or stretching. 2. dilatation. di·la·tion n. 1. . (23) Pharyngeal stricture was also implicated im·pli·cate tr.v. im·pli·cat·ed, im·pli·cat·ing, im·pli·cates 1. To involve or connect intimately or incriminatingly: evidence that implicates others in the plot. 2. as a cause of poor speech in two reports by Lavertu et al. (24,25) In the current study, complications were not associated with the timing of the procedure. Although patients in the primary TEP group had a higher incidence of both surgical and prosthesis-related complications, the differences were not statistically significant. Several investigators have identified radiotherapy as a risk factor for unsuccessful voice outcomes and the development of complications after TEE Silverman and Black found that primary TEP patients who had not been irradiated postoperatively achieved better voice outcomes than did those who had been irradiated. (26) Cantu et al reported that not only postoperative radiation but any history of radiation decreased the success rate. (27) On the other hand, several studies have found that radiotherapy had no effect on vocal rehabilitation or complication rates. (1,6,28) In one of these studies, LaBruna et al retrospectively reviewed 77 patients who had undergone TEP following radiotherapy. (28) All of those patients regained voice function, and 97% of them continued to use tracheoesophageal speech consistently. Only 10% of those patients developed complications during the course of treatment. LaBruna et al concluded that TEP after radiotherapy is a safe and effective method of vocal rehabilitation. Since the advent of organ-preservation treatment strategies for laryngeal laryngeal /lar·yn·ge·al/ (lah-rin´je-al) pertaining to the larynx. la·ryn·geal or la·ryn·gal adj. Of, relating to, affecting, or near the larynx. carcinoma, many of the patients in the current study had already received irradiation with or without chemotherapy by the time they presented for surgical management. Data from the current investigation suggest that neither pre- nor postoperative radiotherapy has any effect on the success of voice restoration or the incidence of complications. However, it is possible that the differences in this study would have reached the level of statistical significance had a larger sample of patients been studied. In conclusion, given that the rates of surgical and prosthesis-related complications associated with primary and secondary TEP are comparable, it appears that primary TEP may be the preferable procedure in view of its superiority with regard to voice acquisition. Furthermore, primary TEP is associated with a shorter duration of aphonia following laryngectomy, and it obviates the need for a second operation and interim tube feedings. References (1.) Singer MI, Blom ED. An endoscopic en·do·scope n. An instrument for examining visually the interior of a bodily canal or a hollow organ such as the colon, bladder, or stomach. en technique for restoration of voice after laryngectomy. Ann Otol Rhinol Laryngol 1980;89: 529-33. (2.) Singer MI, Blom ED, Hamaker RC. Further experience with voice restoration after total laryngectomy. Ann Otol Rhinol Laryngol 1981;90:498-502. (3.) Maves MD, Lingeman RE. Primary vocal rehabilitation using the Blom-Singer and Panje voice prostheses. Ann Otol Rhinol Laryngol 1982;91:458-60. (4.) Koch WM. Total laryngectomy with tracheoesophageal conduit. Otolaryngol Clin North Am 2002;35:1081-96. (5.) Saurajen AS, Chee NW, Siow JK, et al. Tracheoesophageal puncture outcomes and predictors of success in laryngectomised patients. Ann Acad Med Singapore 2000;29:452-6. (6.) Kao WW, Mohr RM, Kimmel CA, et al. The outcome and techniques of primary and secondary tracheoesophageal puncture. Arch Otolaryngol Head Neck Surg 1994; 120:301-7. (7.) Van Weissenbruch R, Albers FW. Vocal rehabilitation after total laryngectomy using the Provox voice prosthesis. Clin Otolaryngol Allied Sci 1993;18:359-64. (8.) Maniglia AJ, Lundy DS, Casiano RC, Swim SC. Speech restoration and complications of primary versus secondary tracheoesophageal puncture following total laryngectomy. Laryngoscope la·ryn·go·scope n. A tubular endoscope that is inserted through the mouth and into the larynx and that is used for examining the interior of the larynx. la·ryn 1989;99: 489-91. (9.) Trudeau MD, Schuller DE, Hall DA. Timing of tracheoesophageal puncture for voice restoration: Primary vs secondary. Head Neck Surg 1988;2(suppl):S130-S134. (10.) Trudeau MD, Hirsch SM, Schuller DE. Vocal restorative re·stor·a·tive adj. 1. Of or relating to restoration. 2. Tending or having the power to restore. n. A medicine or other agent that helps to restore health, strength, or consciousness. surgery: Why wait? Laryngoscope 1986;96:975-7. (11.) Juarbe C, Shemen RL, Eberle R, et al. Primary tracheoesophageal puncture for voice restoration. Am J Surg 1986; 152:464-6. (12.) Maniglia AJ. Vocal rehabilitation after total laryngectomy: A flexible fiberoptic endoscopic technique for tracheoesophageal fistula Tracheoesophageal Fistula Definition Tracheoesophageal fistula (TEF) is commonly a birth defect, with the trachea connected to the esophagus. In most cases, the esophagus is discontinuous, causing immediate feeding difficulties. . Laryngoscope 1982;92:1437-9. (13.) Karlen RG, Maisel RH. Does primary tracheoesophageal puncture reduce complications after laryngectomy and improve patient communication? Am J Otolaryngol 2001;22:324-8. (14.) Fukutake T, Yamashita T. Speech rehabilitation and complications of primary tracheoesophageal puncture. Acta Otolaryngol Suppl 1993;500:117-20. (15.) Wong SH, Yuen AP, Cheung C, et al. Long-term results of voice rehabilitation after total laryngectomy using primary tracheoesophageal puncture in Chinese patients. Am J Otolaryngol 1997; 18:94-8. (16.) Mehta AR, Sarkar S Sarkar could mean:
(17.) Ho CM, Wei WI, Lau WF, et al. Tracheostomal stenosis after immediate tracheoesophageal puncture. Arch Otolaryngol Head Neck Surg 1991;117:662-5. (18.) Singer MI, Hamaker RC, Blom ED, et al. Applications of the voice prosthesis during laryngectomy. Ann Otol Rhinol Laryngol 1989;98:921-5. (19.) Milford CA, Perry AR, Mugliston TA, et al. A British experience of surgical voice restoration as a primary procedure. Arch Otolaryngol Head Neck Surg 1988;114:1419-21. (20.) Hamaker RC, Singer MI, Blom ED, et al. Primary voice restoration at laryngectomy. Arch Otolaryngol 1985; 111:182-6. (21.) Recher G, Pesevanto G, Cristoferi V, et al. Italian experience of voice restoration after laryngectomy with tracheoesophageal puncture. Ann Otol Rhinol Laryngol 1991;100:206-10. (22.) Donegan JO, Gluckman JL, Singh J. Limitations of the Blom-Singer technique for voice restoration. Ann Otol Rhinol Laryngol 1981;90:495-7. (23.) Mehle ME, Lavertu P, Meeker SS, et al. Complications of secondary tracheoesophageal puncture: The Cleveland Clinic Cleveland Clinic (formally known as the Cleveland Clinic Foundation) is a multispecialty academic medical center located in Cleveland, Ohio, USA. Cleveland Clinic was established in 1921 by four physicians for the purpose of providing patient care, research, and medical Foundation experience. Otolaryngol Head Neck Surg 1992; 106:189-92. (24.) Lavertu P, Guay ME, Meeker SS, et al. Secondary tracheoesophageal puncture: Factors predictive of voice quality and prosthesis use. Head Neck 1996;18:393-8. (25.) Lavertu P, Scott SE, Finnegan EM, et al. Secondary tracheoesophageal puncture for voice rehabilitation after laryngectomy. Arch Otolaryngol Head Neck Surg 1989; 115:350-5. (26.) Silverman AH, Black MJ. Efficacy of primary tracheoesophageal puncture in laryngectomy rehabilitation. J Otolaryngol 1994;23: 370-7. (27.) Cantu E, Ryan WJ, Tansey S, et al. Tracheoesophageal speech: Predictors of success and social validity ratings. Am J Otolaryngol 1998;19:12-17. (28.) LaBruna A, Klatsky I, Huo J, et al. Tracheoesophageal puncture in irradiated patients. Ann Otol Rhinol Laryngol 1995; 104:279-81. Elaine Cheng, MD; Margie Ho, MA; Cindy Ganz, MS; Ashok Shaha, MD; Jay O. Boyle, MD; Bhuvanesh Singh, MD; Richard J. Wong, MD; Snehal Patel, MD; Jatin Shah, MD; Ryan C. Branski, PhD; Dennis H. Kraus, MD From the Head and Neck Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York City New York City: see New York, city. New York City City (pop., 2000: 8,008,278), southeastern New York, at the mouth of the Hudson River. The largest city in the U.S. . Reprint requests: Dennis Kraus, MD, Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Ave., New York New York, state, United States New York, Middle Atlantic state of the United States. It is bordered by Vermont, Massachusetts, Connecticut, and the Atlantic Ocean (E), New Jersey and Pennsylvania (S), Lakes Erie and Ontario and the Canadian province of , NY 10021. Phone: (212) 639-5621; fax: (917) 432-2311; e-mail: krausd@mskcc.org Originally presented at the 6th International Conference on Head and Neck Cancer; Aug. 7-11, 2004; Washington, D.C. This work was funded in part by the Garban Intercapital Fund and the Langeloth Foundation.
Table. Patient characteristics and selected results
n (%)
Primary TEP Secondary TEP Total
No. patients 51 (75.0) 17 (25.0) 68 (100)
Median age (yr) 59 57 59
Sex
Men 44 (86.3) 10 (58.8) 54 (79.4)
Women 7 (13.7) 7 (41.2) 14 (20.6)
Voice quality *
Excellent 28 (77.8) 7 (50.0) 35 (70.0)
([dagger]) ([dagger])
Fair 5 (13.9) 5 (35.7) 10 (20.0)
Poor 3 (8.3) 2 (14.3) 5 (10.0)
Surgical complications 22 (43.1) 5 (29.4) 27 (39.7)
Prosthesis complications 24 (47.1) 5 (29.4) 29 (42.6)
Preoperative treatment
None 21 (41.2) 10 (58.9) 31 (45.6)
Radiotherapy 19 (37.3) 4 (23.5) 23 (33.8)
Chemo- and radiotherapy 11 (21.6) 3 (17.6) 14 (20.6)
Postoperative treatment
None 32 (62.7) 10 (58.9) 42 (61.8)
Radiotherapy 16 (31.4) 7 (41.2) 23 (33.8)
Chemo- and radiotherapy 3 (5.9) 0 3 (4.4)
* Voice quality data were available for only 36 patients
in the primary TEP group and 14 in the secondary group.
([dagger]) Statistically significant difference (p = 0.03).
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