Stereotactic Ablative Radiotherapy for Early-stage Glottic Larynx Cancer

SBRT treatment will be delivered to patients diagnosed with stage I-II glottic larynx cancer twice per week for 5 fractions (42.5 Gy cohort, low-risk) or daily for 16 fractions (58.08 Gy cohort, moderate-risk).

Low-risk is defined by:

• Planning target volume (PTV) less than 10 cc, AND
• No reported smoking within 1 month from registration

Moderate-risk is defined by:

• Planning target volume (PTV) greater than or equal to 10 cc, OR
• Smoking within 1 month from registration (no more than 1 pack per day)

Inclusion criteria

• Pathologically-proven diagnosis of squamous cell carcinoma in situ, squamous cell carcinoma or squamous cell variants (sarcomatoid, verrucous, basaloid, and papillary subtypes) involving the glottic larynx.
• Clinical stage I-II (American Joint Committee on Cancer AJCC, 7th edition) with direct laryngoscopy showing no evidence of greater than stage II true glottic larynx cancer and PET/CT or CT neck showing no evidence of regional disease.
• Age ≥ 18 years.
• ECOG Performance Status 0-2
• Women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation, and for 90 days following completion of therapy. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately.

5.1 A female of child-bearing potential is any woman (regardless of sexual orientation, having undergone a tubal ligation, or remaining celibate by choice) who meets the following criteria:

• Has not undergone a hysterectomy or bilateral oophorectomy; or
• Has not been naturally postmenopausal for at least 12 consecutive months (i.e., has had menses at any time in the preceding 12 consecutive months).
• Negative serum or urine pregnancy test within 2 weeks before registration for women of childbearing potential.
• Ability to understand and the willingness to sign a written informed consent.
• Patients with cognitive impairment or other limited decision making capacity with the ability to understand and willingly sign written informed consent or have the consent signed by a designated legally authorized representative (LAR)

Exclusion criteria

• AJCC stage III or stage IV larynx cancer
• Involvement of the arytenoid cartilage beyond the vocal process.
• Prior chemotherapy for treatment of the targeted larynx lesion
• Synchronous primaries in the head and neck
• Prior radiotherapy to the region of the study cancer that would result in overlap of radiation fields.
• Subjects smoking in excess of 1 pack of cigarettes per day.
• Subjects may not be receiving any other investigational agents.
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.
• Subjects must not be pregnant or nursing due to the potential for congenital abnormalities and the potential of this regimen to harm nursing infants.