Dr Theo Gregor - Head and neck surgeon - Otolaryngologist - Head and neck cancer operations - Hamilton New Zealand



1. Gregor RT: Conn's Syndrome. S Afr J Surg, 11:40‑41; 1973.


2. Gregor RT: Renal Trauma. The Leech, 10:78‑80; 1973.


3. Gregor RT: Vitiligo and Malignant Melanoma, a Significant Association? S Afr Med J, 50:1447‑1449; 1976.


4. Michaels L & Gregor RT: Examination of the Larynx in the Histopathology laboratory. J Clin Path. 33:705‑710; 1980.


5. Gregor RT: Malignant Lymphoma of the Larynx, an Entity? J of Laryngol. & Otol. 95:81‑93; 1981.


6. Gregor RT, Lloyd GAS & Michaels L: Computed Tomography of the Larynx; a Clinical and Pathological Study. Head Neck Surg. 3:284‑296; 1981.


7. Gregor RT: & Heng B: Minor Salivary Gland Carcinomas of the mouth and oropharynx. J Otolaryngol. 10:276‑271; 1981.


8. Capper JWR, Michaels L & Gregor RT: Malignant Carcinoid Tumour of the Supraglottic Larynx. J Laryngol & Otol. 95:963‑971; 1981.


9. Gregor, RT: The use of the Pectoralis Major Myocutaneous Island Flap for reconstruction after Major Ablative Head & Neck Surgery. S Afr Med J 61:788‑792, 1982.


10. Srigley JR, Dayal VS, Gregor RT & van Nostrand, AWP: Hyponatraemia Secondary to Olfactory Neuroblastoma. Arch. Otolaryngol. 109:559‑562 1983.


11. Herzanu Y, Mendelsohn DB, Waner M & Gregor RT: Protruding Jugular Bulb presenting as a middle ear mass. S Afr Med J. 63:900‑901; 1983.


12. Gregor, RT & Hassman, E: Pulmonary function testing in Postlaryngectomy patients, related to stomal size. Acta Otolaryngol. (Stock.) 97:177‑183; 1984.


13. Gregor, RT & Davidge‑Pitts, KJ: The Management of Laryngo‑tracheal Injury. S Afr J Surg. 22:79‑86; 1984.


14. Gregor, RT & Davidge‑Pitts, KJ: Trapezius Osteomyocutaneous flap for mandibular reconstruction. Arch Otolaryngol. 111:198‑203; 1985


15. Joseph, C, Gregor, RT, & Davidge‑Pitts, KJ: The Role of the Functional Neck Dissection in the Management of Advanced Tumours of the aero‑digestive tract. S Afr J Surg. 23:83‑87; 1985


16. Joseph, C, Gregor, RT, Davidge‑Pitts, KJ and Waner, M. The versatility of the Pectoralis Major Myocutaneous Flap. Head Neck Surg. 7:365‑368; 1985.


17. Joseph, CA, Waner, M, Gregor, RT & Davidge‑Pitts, KJ: Pharyngo‑oesophageal reconstruction using the Pectoralis Major Myocutaneous Flap. S Afr J Surg; 23:67‑69. 1985.


18. Gregor, RT, Waner, M, Davidge‑Pitts, KJ & Joseph, CA: The evaluation of a suspected Malignant Lymph node in the neck. S Afr J Surg. 23: 79‑82; 1985.


19. Gregor, RT, & Hammond, Kate: Framework Invasion of Laryngeal  Carcinoma Am. J Surg 11:23, 297. 1987


20. Gregor RT: The use of the Carbon Dioxide Laser in dealing with fibrous strictures of the larynx and trachea. J Otolaryngol. 17:1, 16‑18; 1988


21. Joseph CA, Fayman MS, Kadwa MA, & Gregor RT: The Pectoralis Major Flap for reconstruction of septic wounds. S. Afr. J. Surg 26:107‑109. 1988


22. Hammond KD, Mohammed E & Gregor RT: Alkaline Phosphatase and Phosphoamino Acid Phosphatases in Normal and Cancerous Tissues of the Human Larynx. Biochem Med & Metabolic Biol.43:75‑79. 1990


23. Gregor RT: The Preepiglottic Space Revisited: Is it Significant? Am. J. Otolaryngol 11:161‑164, 1990.


24. Gregor RT: Ventriculo-Saccular carcinoma of the larynx. S.A. J. of Surgery 28:86‑88, 1990


25. Gregor RT, Ninin D: Sinus histiocytosis - a rare tumour involving the paranasal sinuses. Ear Nose Throat J. 72(4):291-2,295, 1993.


26. Allphin AL, Maniglia AJ, Gregor RT & Sawyer R: Myxomas of the mandible and maxilla. Ear Nose Throat J. 72(4):280-4, 1993.


27. Gregor RT and Loftus B: Myxoma of the Paranasal Sinuses. J. Laryngol. Otol. 108:679-681, 1994.


28. Gregor RT and Ninnin D: Rosai-Dorfman disease of the paranasal sinuses J. Laryngol. Otol. 108:152-155, 1994.


29. Gregor RT, Loftus B, Cohen P, Balm AJM, Hilgers FJM. Saccular Mucocoele in Laryngeal Cancer. Ann Otol Rhinol Laryngol. 103:732-736, 1994.


30. Takes RP, Balm AJM, Loftus BM, Baris G, Hilgers FJM, and Gregor RT. Merkel cell carcinoma of the Head and Neck. Clin Otolaryngol.19:222-229, 1994.


31. Balm AJM, Kroon BBR, Gregor RT & Hilgers FJM. Value of Lymph node dissection in head and neck melanoma. Diagnostic Oncology. 3:263-267, 1994.


32. Van Vuuren PAC, Balm AJM, Gregor RT, Hilgers FJM, Loftus BM Delprat CC & Rutgers EJT. Carcinoma arising in thyroglossal remnants. Clin Otolaryngol. 19:509-515. 1994.


33. Gregor RT. Anatomical patterns of spread of laryngeal Cancer. Excerpta Medica, Elsevier. Proceedings of the second World Congress of Laryngeal Cancer, Sydney, Australia, Feb. 1994. R Smee and G P Bridger, pp224-228.


34. Gregor RT, Oei SS, Baris G, Keus RB, Balm AJM, Hilgers FJM. The role of horizontal partial laryngectomy (HPL) in the treatment of supraglottic cancer - a ten year study. Excerpta Medica, Elsevier. Proceedings of the second World Congress on Laryngeal Cancer, Sydney, Australia. Feb., 1994. R Smee and G P Bridger, pp476-480.


35. Hilgers FJM, Elias MM, Baris G, Balm AJM, Gregor RT, Hart AA. Carcinoma of the hypopharynx: a retrospective analysis of the treatment results over a twenty year period (1994). Laryngeal Cancer, Elsevier, Amsterdam. Proceedings of the second World Congress on Laryngeal Cancer, Sydney, Australia. Feb., 1994. R Smee & G P Bridger (Eds.), pp596-601.


36. Plaat BEC, Balm AJM, Loftus BM, Gregor RT and Hilgers FJM, Keus RB. Fibromatosis of the head and neck. Clinical Otolaryngology. 20:103-109. 1995.


37. Hilgers, FJM, Balm AJM & Gregor RT. Voice restoration with the PROVOX voice prosthesis, surgical and technical aspects. (German) HNO:43:197-201. 1995.


38. Hilgers FJM, Balm AJM & Gregor, RT. Voice restoration after total laryngectomy with the PROVOXTM voice rehabilatation system: Surgical and technical aspects. (German) HNO 43:197-201, 1995. Part II: HNO 43:261-267, 1995.


39. Dijkstra MD, Balm AJM, Gregor RT, Hilgers FJM, Loftus BM. Soft tissue sarcomas of the head and neck associated with surgical trauma. J of Laryngol Otol. 109:126-129, 1995.


40. van der Laan BFAM, Baris G, Gregor RT, Hilgers FJM & Balm AJM. Radiation induced tumours of the head and neck. J of Laryngol and Otol. 109:346-349, 1995.


41. Balm AJM, Ackerstaff AH, Hilgers FJM, Gregor RT, Bos KE. Psychological aspects of major head and neck Reconstructive surgery. Facial Plast Surg 11:91-98, 1995.


42. Elias MM, Hilgers FJM, Keus RB, Gregor RT, Hart AAM & Balm AJM. Carcinoma of the pyriform sinus: a retrospective analysis of treatment results over a 20-year period. Clinical Otolaryngol 20:249-253, 1995.


43. Wedman J, Balm AJM, Hart AAM, Loftus BM, Hilgers FJM, Gregor RT, van Zandwijk N, Zoetmulder FAN. The value of resection of pulmonary metastases in patients with head and neck cancer patients. Head & Neck, 18:311-316, 1996.


44. Leemans CR, Balm AJM, Gregor RT, & Hilgers FJM, Management of carotid artery exposure with Pectoralis major myofascial flap transfer and split thickness skin coverage. J Laryngol Otol. 109:1176-1180, 1995.


45. Balm AJM, van Coevorden F, Bos KE, Fletcher CDM, Gortzak E, Gregor RT, Hilgers FJM, Keus RB, Koops W, Kroon BBR, vd Laan BFAM, Loftus BM, Nieweg OE, Somers R, Wanebo WJ. Report of a symposium on diagnosis and treatment of adult soft tissue sarcomas in the head and neck. European Journal of Surgical Oncology. 21:287-289, 1995.


46. Gregor RT, Oei SS, Baris G, Keus RB, Balm AJM, Hilgers FJM.   Supraglottic laryngectomy with postoperative radiation versus primary radiation in the management of supraglottic laryngeal cancer. Am J. Otolaryngol, 18:316-321, 1996.


47. Dijkstra MD, Balm AJM, van Coevorden F, Gregor RT, Hart AAM, Hilgers FJM, Keus RB and Loftus BM. Survival of adult patients with head and neck soft tissue sarcomas. Clinical Otolaryngol. 20:66-71, 1996


48. de Gier HHW, Balm AJM, Bruning PF, Gregor RT, Hilgers FJM. Treatment of chylous leakage after neck dissection. Head & Neck, 18:347-351, 1996.


49. Gregor RT, Valdés Olmos R, Koops W, Balm AJM, Hilgers FJM, Hoefnagel CA. Preliminary experience with Thallous Tl-201 labelled single-photon emission computed tomography scanning in head and neck cancer. Arch Otolaryngol Head Neck Surg 122:509-514, 1996.


50. Verschuur HP, Hilgers FJM, Balm AJM & Gregor RT. Tracheostoma reconstruction and Prosthetic voice rehabilitation. Laryngoscope 106:111-115, 1996.


51. Gregor RT, Oei SS, Hilgers FJM, Balm AJM and Keus RB. Management of Cervical metastases in Supraglottic Cancer. Ann Otol Rhinol Laryngol 105:845-850, 1996.


52. Verschuur HP, Keus RB, Hilgers FJM, Balm AJM & Gregor RT. Preservation of function by radiotherapy  of small primary carcinomas preceded by neck dissection for extensive nodal metastases of the head and neck. Head Neck 18:277-282, 1996.


53. Hilgers FJM, Balm AJM, Gregor RT, Ackerstaff AH & Scholtens BEGM. Voice results using the indwelling PROVOX prosthesis. Voice Update, Elsevier Science, 1996, pp173-182. (Proceedings)


54. Hilgers FJM, Ackerstaff AH, Balm AJM & Gregor RT. A new heat and moisture exchanger with speech valve (PROVOXR stomafilter) 21:414-418, 1996.


55. Knappe, M & Gregor RT, Luc's abscess - a rare complication of middle-ear infection. J Laryngol. Otol. 111:461-464, 1997.


56. Gregor RT, Plit M & Webster T. The use of the flow volume loop in assessing the results of laryngotracheal reconstruction. SA J Surg. 35:210-214, 1997.


57. Valdés Olmos, R A, Balm JM, Hilgers FJM, Koops W, Loftus BM, Tan IB, Muller SH, Hoefnagel CA & Gregor RT. Thallium SPECT in the diagnosis of head and neck cancer. J Nucl Med. 38:873-879. 1997.


58. Knappe M , Schneider JW,  Gregor RT, Pathological quiz:: Tracheal Tuberculosis. Arch. Otolaryngol H N Surg. 124:469,471, 1998.


59. Valdés Olmos R A, Koops W, Loftus BM, Gregor RT, Hoefnagel CA, Hilgers FJM & Balm AJM. Correlative 201Tl SPECT, MRI and Ex Vivo 201Tl uptake in detecting and characterizing cervical lymphadenopathy in head and neck squamous carcinoma. J Nucl Med 40:1414-1419, 1999


60. Gregor RT, Management of Chyle fistulization in association with Neck Dissection. Otolaryngol Head Neck Surg. 122:434-439, 2000.


61. Knappe M, Louw M & Gregor RT. Ultrasonagraphy-Guided fine needle aspiration for the assessment of cervical metastases. Arch Otolaryngol Head Neck Surg.126:1091-1096, 2000


62. Cornu, AS, Vlantis AC, Elliot H & Gregor RT. Voice rehabilitation after laryngectomy with the Provoxâ prosthesis in South Africa. J Laryngol Otol. 117(1): 56-9.  January 2003.


63. Pennings RJE, van der Hoogen FJA, Gregor RT. De Co2 laser bij behandeling van tumoren van larynx en hypopharynx. Ned Tijdschr KNO-Heelk. 9(1): 7-14. January 2003. (The use of the CO2 laser in treating tumours of the larynx and hypoharynx)


64. Vlantis AC, Gregor RT, Elliot H, Oudes M. Conversion from a non-indwelling to a ProvoxÒ2 indwelling voice prosthesis for speech rehabilitation: comparison of voice quality and patient preference. J. Laryngol. Otol. 117: 815-820, October 2003.


65. Ch'ng S, Maira A, Allison RS, Chaplin JM,Gregor RT, Lea R & Tan ST. Parotid and Cervical Nodal Status predict prognosis for patients with head and neck Cutaneous Squamous Carcinoma. J Surg Oncol 98: 101-105. 2008


66. Rasch C, Hauptmann M, Schornagel J, Wijers O, Buter J, Gregor RT, et al Intra-arterial Versus Intravenous Chemoradiation for Advanced Head & Neck Cancer: Results of a Randomized Phase 3 Trial. Cancer: 116: 2159-65, 2010.


67. Ackerstaff A, Rasch C, Balm A, de Boer J, Wiggenraad R, Rietveld D, Gregor RT, et al. Five Years Quality of Life Results of the Randomized Clinical phase III (RADPLAT) trial Comparing concomitant intra-arterial versus intravenous chemoradiotherapy in Locally Advanced Head and Neck Cancer. Head & Neck: 34(7): 974-980. 2011.




1. Hassman E, Michaels L & Gregor RT: Ventriculo‑saccular Carcinoma of the Larynx. Clin Otolaryngol. 5:419, 1980 (ABSTRACT)


 2. Gregor RT & Michaels L: CT Scans of the larynx, correlated with examination of the larynx by a new method. Clin Otolaryngol. 5:352; 1980 (ABSTRACT)


 3. Hammond KD, Mohammed E, & Gregor, RT: (ABS) Poster Abstract. 6th International Congress on Clinical Enzymology, Hanover Sept. 16‑19, 1987. Enzyme 38. (Suppl. 1)


 4. Mak-Kregar S, Baris G, Keus RB, Balm AJM, Gregor, RT & Hilgers, FJM. Epidemiologie en stadiëring van het orofarynxcarcinoom. Ned Tijdschr Geneeskd 138:1502 1994. ABSTRACT.


 5. Keus RB, Baris G, Hilgers FJM, Balm AJM & Gregor, RT. Conformatie-radiotherapie in het Hoofd-halsgebied: mogelijkheden van teletherapie. Ned Tijdschr Geneeskd. 138:1503. 1994. ABSTRACT.


 6. Elias MM, Hilgers FJM, Baris G, Gregor RT, Hart AA, & Balm AJM. Carcinoma of the pyriform sinus; a retrospective analysis of treatment results over a 20 year period. Clin Otolaryngol. 19:545, 1994. ABSTRACT.





1. Carcinoma of the Upper Aerodigestive Tract. 'Modern Surgery in Africa; The Baragwanath Experience.' Ed. D Pantanowitz. Southern Publishers, Johannesburg, 1988.


 2. Framework invasion in Laryngeal Carcinoma, in 'Laryngeal Cancer', Ed. Carl Silver, Thieme Medical Publishers, NY, USA 1991, pp 14‑21.


 3. Total Laryngectomy in 'Operative Otorhinolaryngology' Eds.: A. van Hasselt, C. Milford, N. Bleach. Pp 365-372. Blackwell Scientific publications, Oxford, 1997.


4. Supraglottic Laryngectomy in 'Operative Otorhinolaryngology' Eds.: A. van Hasselt, C. Milford, N. Bleach. Pp 383-386. Blackwell Scientific publications, Oxford, 1997.


5. Neck Node Metastases in "Diseases of the Head & Neck, Nose and Throat" Eds.: Jones, Philips and Hilgers. Pp 386-404, Edward Arnold, London. 1998.


6. Tumours of the Larynx in "Diseases of the Head & Neck, Nose and Throat" Eds.: Jones, Philips and Hilgers. Pp 207-229. Edward Arnold, London. 1998.