Inclusion Criteria:

1. Any patient with advanced lung cancer whether or not receiving specific anti-cancer
therapy

2. Mentally competent (but need not be fluent in French or English if capable neutral
translator available)

3. Self report of reduced food intake and/or involuntary weight loss of any extent at
time of enrollment: does not have to be documented

Exclusion Criteria:

1. Current diagnosis of primary hyperparathyroidism

2. Nephrocalcinosis

3. Current or suspected active tuberculosis, histoplasmosis, sarcoidosis, or other
granulomatous disease

4. Current using a vitamin D supplement providing > 1000 IU/day

5. Current prescribed calcitriol in any dose

6. History of extensive sunlight exposure (> 30 min summer sunlight exposure per day for
more than 5 days per week) in previous 3 months

7. Expected to die within next 2 months

8. Pregnancy