Surgery followed by radiotherapy and chemotherapy started at the beginning of radiotherapy. Segmentectomy or lobectomy with en bloc resection of the involved chest. Radiation therapy consists of 60 Gy in 50 fractions for negative margins, or 64.8 Gy in 54 fractions for positive margins, at 1.2 Gy per fraction, 2 fractions per day, 5 days per week. Cisplatin 50 mg/M^2 given intravenously on days 1 and 8; the cycle will be repeated beginning on day 29.

Etoposide given by mouth 30-60 minutes prior to each administration of radiotherapy, on days 1-5 and days 8-12; the cycle will be repeated beginning day 29. Prophylactic Cranial Irradiation 25 Gy in 10 fractions of 2.5 Gy, 1 fraction per day, will be given at the completion of chest irradiation, and is optional.

Segmentectomy or lobectomy with en bloc resection of the involved chest.

Locoregional control (LRC) defined as disease non-recurrence in a localized area for patients with resectable superior sulcus tumors treated with surgical resection followed by adjuvant chemoradiation. LRC measured as percentage of participants without recurrence at rates of local control as measured Years 2, 5, and 10.