What to ask after a colon cancer diagnosis

Short answer: After a colon cancer (or colorectal) diagnosis, the questions that shape treatment are about the exact location and stage, whether the tumor has been tested for MSI/MMR and RAS/BRAF mutations, the plan and order for surgery, chemotherapy, and (for rectal cancer) radiation, and whether a temporary or permanent ostomy might be part of recovery. Full checklist below.

Colorectal cancer treatment has changed meaningfully in the last few years — biomarker testing now unlocks immunotherapy for a subset of patients, and rectal cancer especially has new "watch-and-wait" options after chemoradiation. The questions below make sure those doors get opened before treatment starts.

Questions about the diagnosis itself

• Where exactly is the tumor — colon (which segment) or rectum? Rectal cancer is treated very differently.
• What stage is it, and what does that stage mean in practical terms?
• Has it spread to lymph nodes or elsewhere? How was that determined — CT, MRI (for rectal), PET, liver imaging?
• What was in the pathology report — grade, margins, lymphovascular invasion, perineural invasion?

Questions about biomarker and molecular testing

• Has my tumor been tested for microsatellite instability (MSI) or mismatch repair (MMR)?
• Has it been tested for KRAS, NRAS, BRAF, and HER2?
• Do the results open the door to immunotherapy or targeted therapy?
• Should I have genetic counseling for Lynch syndrome or other hereditary colorectal cancer syndromes?

Questions about treatment options

• What are all the treatment paths being considered — surgery, chemotherapy, radiation (for rectal), immunotherapy?
• What surgery is recommended, and can it be done minimally invasively (laparoscopic or robotic)?
• Will I need a temporary or permanent ostomy? If temporary, when would it be reversed?
• If rectal cancer, am I a candidate for total neoadjuvant therapy (TNT) or "watch and wait" after chemoradiation?
• Is chemotherapy needed before or after surgery, and for how many months?
• Are there clinical trials relevant to my stage and biomarker profile?

Questions about surgery specifics

• How many operations like this does the surgeon do per year?
• What's the expected hospital stay and recovery timeline?
• What are the risks specific to this surgery (leak, infection, bowel function, sexual function, urinary function)?
• Will I need an ostomy nurse consult before surgery?

Questions about timeline and logistics

• How soon does treatment need to start?
• What does the realistic week-to-week timeline look like?
• Will I be able to work, and how much time off should I plan for?

Questions about side effects and quality of life

• What are the most common side effects of the recommended chemotherapy, and which ones need an urgent call (neutropenia, neuropathy, diarrhea)?
• What long-term effects should I know about — bowel changes, neuropathy, fertility?
• What nutrition support is available before and after surgery?

Questions about support

• Is there a patient navigator or colorectal oncology social worker?
• What colorectal-specific support organizations do you recommend? (Colorectal Cancer Alliance, Fight Colorectal Cancer.)
• Are there support groups for people with an ostomy?

A note on second opinions

Colorectal cancer treatment is especially subspecialized — surgical technique, use of TNT for rectal cancer, and biomarker-driven therapy all vary between centers. A second opinion at a high-volume colorectal program rarely delays treatment.

If your first appointment left you with a report full of words you don't understand, how to read a pathology report you don't understand is a plain-language walkthrough. For the first 72 hours after diagnosis, what to do first after a cancer diagnosis walks through the order that matters.

Related reading

• Symptoms of colon cancer — early signs and when to see a doctor.
• Just diagnosed with cancer: what to do first — the first 72 hours, in order.
• Questions to ask after any new diagnosis — the full framework.

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This post is for general informational purposes and isn't a substitute for guidance from your care team.