Patients receive PI3K Inhibitor BKM120 orally (PO) once daily (QD) on days 1-21, cisplatin intravenously (IV) over 2 hours on day 1 and etoposide IV over 1 hour on days 1-3. Treatment repeats every 21 days for up to 6 courses in the absence of disease progression or unacceptable toxicity.