Treatment of mandibular squamous cell carcinoma in cats by use of mandibulectomy and radiotherapy: Seven cases (1987-1989)

Christina A. Hutson From the Departments of Oncology (Hutson) and Surgery (Willauer), Animal Cancer Center, 1560 Pacific Coast Hwy, Hermosa Beach, CA 90254; Department of Pathology, (Walder), Veterinary Reference Lab, 1871 Chris Ln, Anaheim, CA 92805; Santa Cruz Veterinary Group Tumor Institute, 2585 Soquel Dr, Santa Cruz, CA 95065, (Stone); and the All Care Animal Referral Center, 18440 Amistad NE, Fountain Valley, CA 92708, (Klein).

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Curtis C. Willauer From the Departments of Oncology (Hutson) and Surgery (Willauer), Animal Cancer Center, 1560 Pacific Coast Hwy, Hermosa Beach, CA 90254; Department of Pathology, (Walder), Veterinary Reference Lab, 1871 Chris Ln, Anaheim, CA 92805; Santa Cruz Veterinary Group Tumor Institute, 2585 Soquel Dr, Santa Cruz, CA 95065, (Stone); and the All Care Animal Referral Center, 18440 Amistad NE, Fountain Valley, CA 92708, (Klein).

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Emily J. Walder From the Departments of Oncology (Hutson) and Surgery (Willauer), Animal Cancer Center, 1560 Pacific Coast Hwy, Hermosa Beach, CA 90254; Department of Pathology, (Walder), Veterinary Reference Lab, 1871 Chris Ln, Anaheim, CA 92805; Santa Cruz Veterinary Group Tumor Institute, 2585 Soquel Dr, Santa Cruz, CA 95065, (Stone); and the All Care Animal Referral Center, 18440 Amistad NE, Fountain Valley, CA 92708, (Klein).

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Jay L. Stone From the Departments of Oncology (Hutson) and Surgery (Willauer), Animal Cancer Center, 1560 Pacific Coast Hwy, Hermosa Beach, CA 90254; Department of Pathology, (Walder), Veterinary Reference Lab, 1871 Chris Ln, Anaheim, CA 92805; Santa Cruz Veterinary Group Tumor Institute, 2585 Soquel Dr, Santa Cruz, CA 95065, (Stone); and the All Care Animal Referral Center, 18440 Amistad NE, Fountain Valley, CA 92708, (Klein).

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Mary K. Klein From the Departments of Oncology (Hutson) and Surgery (Willauer), Animal Cancer Center, 1560 Pacific Coast Hwy, Hermosa Beach, CA 90254; Department of Pathology, (Walder), Veterinary Reference Lab, 1871 Chris Ln, Anaheim, CA 92805; Santa Cruz Veterinary Group Tumor Institute, 2585 Soquel Dr, Santa Cruz, CA 95065, (Stone); and the All Care Animal Referral Center, 18440 Amistad NE, Fountain Valley, CA 92708, (Klein).

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Summary

Seven cats with squamous cell carcinoma involving the mandible were treated by surgery and radiotherapy. Surgery consisted of hemimandibulectomy or combined rostral and hemimandibulectomy, gastrostomy tube placement, and submandibular lymph node excisional biopsy. Radiotherapy (orthovoltage or 60Co) commenced 2 weeks after surgery. Histologically, the tumor invaded surgical margins in 6 of 7 cats. Nerve infiltration was histologically identified in 2 cats. All cats had stage-3 disease with radiographic evidence of mandibular bone involvement. Age ranged between 8 and 16 years (median, 10 years). Hypercalcemia (2), feline immunodeficiency virus (2), and hyperthyroidism (1), were detected in cats prior to treatment. Survival after surgery,) was a median of 14 months (range = 3 to 36 months, mean = 15 months). Six cats were euthanatized because of recurrence of disease at 3, 7, 9, 16, 21, and 36 months. One cat was euthanatized at 14 months because of an unrelated disease. Complications of tongue lagging, drooling after meals, mandibular drift, maxillary ulceration, and alopecia of the jaw developed in a few cats. Radiation at the primary site and regional lymph nodes after surgery of curative intent extended survival in cats with mandibular squamous cell carcinoma.

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