Hi,
Your father-in-law has cancer of the lung (Stage 4), which has spread to the adrenal gland.
Lung cancer has 4 stages, with Stage 1 being the earliest disease, and Stage 4 being the most advanced.
To answer your question "How many stages of cancer are there", that depends on which specific cancer we are talking about and which staging system we use. For example, some cancers (like acute leukemias) are not usually assigned stages, and some specific staging systems may assign 3 stages (like Salmon-Durie staging for multiple myeloma), or 5 stages (like the National Wilms Tumor Study Group Staging System for Wilms Tumor).
But generally speaking, most cancers are staged according to the TNM system, which assigns 4 stages, with Stage 4 representing advanced disease with spread of the primary cancer to distant organs.
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