Prognostic significance of cyclin D1 protein levels in early‐stage larynx cancer treated with primary radiation

• Published in: International journal of cancer 2000-02, Vol.90 (1), p.22-28
• Main Authors: Yoo, Simon S., Carter, Darryl, Turner, Bruce C., Sasaki, Clarence T., Son, Yung H., Wilson, Lynn D., Glazer, Peter M., Haffty, Bruce G.
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Carcinoma, Squamous Cell - chemistry; Carcinoma, Squamous Cell - pathology; Carcinoma, Squamous Cell - radiotherapy; Case-Control Studies; cyclin D1; Cyclin D1 - analysis; Diseases of the upper aerodigestive tract; Ent and stomatology; Female; head and neck cancer; Humans; Laryngeal Neoplasms - chemistry; Laryngeal Neoplasms - pathology; Laryngeal Neoplasms - radiotherapy; larynx cancer; Male; Medical sciences; Middle Aged; Neoplasm Proteins - analysis; Neoplasm Recurrence, Local - chemistry; Neoplasm Recurrence, Local - pathology; Neoplasm Staging; Prognosis; proliferating cell nuclear antigen (PCNA); Proliferating Cell Nuclear Antigen - analysis; radiation sensitivity; Radiotherapy Dosage; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); squamous cell carcinoma
• ISSN: 0020-7136; 1097-0215
• DOI: 10.1002/(SICI)1097-0215(20000220)90:1<22::AID-IJC3>3.0.CO;2-T

Recent laboratory experiments have demonstrated that cyclin D1 levels (cycD1) can influence radiosensitivity. The purpose of the current study is to evaluate the prognostic significance of cycD1 for local recurrence in early‐stage larynx cancer treated with primary radiation therapy. The study was conducted using a matched case‐control design in 60 early‐stage (T1‐T2/N0) larynx cancer patients. All patients had squamous cell carcinoma of the larynx and were treated with primary radiation to a total median dose of 66 Gy in daily fractions of 2 Gy, without surgery or chemotherapy. Thirty patients who suffered a local relapse in the larynx after treatment served as the index case population. These 30 cases were matched by age, sex, site (glottic vs. supraglottic), radiation therapy technique/dose, and follow‐up, to 30 control patients who did not experience a local relapse. Immunohistochemical staining from cycD1 was performed on the paraffin‐embedded specimens. The pathologist, blinded to the clinical information, scored each of the specimens on a four‐point intensity scale (0 = no stain, 1 = faint, 2 = moderate, 3 = strong) and percent distribution. Patients were considered to be positive for cyclin D1 if the staining was 2+ or greater with a percent distribution of at least 5%. By design of the study, the two groups were evenly balanced with respect to age, sex, stage, radiation dose, and follow‐up. CycD1 levels correlated with proliferating cell nuclear antigen levels. Low levels of cycD1 significantly correlated with local relapse; 19/30 (63%) of the index cases stained negative, while only 10/30 (33%) of the control cases stained negative (P = 0.03). These data suggest that low levels of cycD1 correlate with relatively radioresistant early‐stage larynx carcinoma. With larger more confirmatory clinical and laboratory data, this data may have significant clinical implications. Int. J. Cancer (Radiat. Oncol. Invest.) 90, 22–28 (2000). © 2000 Wiley‐Liss, Inc.