A 79 year old woman complaining of persistent cough presents to the clinic for chest x-ray. A small nodule is detected on the x-ray. Biopsy of the nodule reveals adenocarcinoma containing progesterone receptors. Her past history is significant for endometrial carcinoma treated 2 years ago.
What is the most effective treatment for this patient?
A-Cytotoxic agents
B-Lobectomy
C-Progestin therapy
D-Radiotherapy