How long can a person with pancreatic cancer be expected to live without surgery and only with chemo therapy?

Depends. This really depends on the patient's given clinical situtation including the extent of their disease, other illness that he/she may already have, and their performance status (how well they can or can not do things on their own) but a rough estimate would be about a year.
Less than a year. Patients with metastatic cancer live generally less than 6 months without treatment and had a median survival of 11 months with an aggressive chemo regimen recently studied (folfirinox). Unfortunately, patients with locally advanced and even "resectable" disease who can not get resection usually do not fare better with chemotherapy alone despite having no evidence of spread initially.
Re-research. As dr bose correctly pointed out, most patients live only 11 months even with aggressive chemotherapy, and the so called targeted therapy tarceva (erlotinib) only adds survival by 12 days, and it costs (*000, 00) dollars. In my own lab, we found many "cheap" drugs probably more effective then the expensive ones, but again, we need more research to prove it. Funding....

Related Questions

Diagnosed with stage 1 pancreatic cancer in the head of the pancreas, I don't want surgery or chemotherapy how long will I live?

Untreated, 1-2 years. Pancreatic cancer can only be staged after surgery- information provided by a pathologist is necessary to assign a stage. If you have what appears to be early stage pancreatic cancer it would be foolish not to seek treatment since surgery can cure up to 40% of cases, and while big surgery, the risk is low (around 1%). Depending on pathology findings postop chemotherapy may provide added benefit.
You can be cured! Stage I pancreas cancer can be cured! But, surgery is a must! If you don't have surgery, it will become life-threatening within months to a few years. Please go to a cancer center where a pancreas surgeon performs many procedures per year.

Are there different types of chemotherapy for a person with localized recurrent pancreatic cancer? Want to reduce dimensions. Can you name some?

Options. It depends on the size of the tumor, what therapy has already been given at the time of the original diagnosis, and the overall health of the patient but here are some possibilities: FOLFIRINOX, Gem-Abraxane, Gemcitabine, 5-FU, and checkpoint inhibitors. Hope this helps, and best wishes!

Andreas has pancreatic cancer with no spread to nearby organs. After three rounds of chemotherapy, both oral and infusion, the tumor has shrunk from 4.8 to 2.8 cm. The tumor is not operable due to scar tissues. Is there any other option?

Wait/continue Chemo. Likely your best option is to keep going with chemo. Or wait and see with frequent check-ups. It seems promising so far.
Local aggressive. Some promising results with local aggressive treatment to the persisting mass and regional lymphatics followed by more chemotherapy. We have used cybeknife radiosurgery before and or after a course of chemo radiation to the above described regions with good results. No disease spread to other areas and shrinking mass after couple of rounds of chemo is encouraging.
Vascular involvement. The key questions here if the mass has shrunk are (1) has it spread to other organs, and (2) are the major arteries involved by the tumor? If there is major vascular involvement, it is considered unresectable. That is a possible scenario if it is a pancreatic body tumor. The best options would still include chemotherapy., especially if your tumor responded initially to chemotherapy.

Besides IRE, cyberknife, chemotherapy, diet, radiotherapy and clinical trials, what else may be an upcoming procedure for pancreatic cancer patients?

Chemoimmunotherapy. An immunotherapeutic approach to metastatic pancreatic cancer having failed all forms of chemotherapy has been developed and has finished phase II trials. The results are produced by antibody Neo 102 targeting a post translational modification of MUC5ac which is an oncofetal protein expressing mucin production in the GI tract of the fetus. The mAb targets the protein by ADCC of better than 70%.
The future is coming. Nanoparticle therapy, biologic therapies, and vaccine trials are coming up in the next few years for pancreatic cancer. A lot of work still to be done!

What effects might myasthenia graves have on radiation and chemotherapy treatment for pancreatic cancer?

See prior answer. In brief, anesthesia, neuromuscular blockers, surgery itself can all result in post-operative respiratory failure, with need for trach and respirator. The chemo may also affect the neuromuscular junction. Need a careful coordinated team approach with your neurologist constantly monitoring.

Can natural/chinese therapy in conjunction with chemo be used to fight pancreatic cancer?

What is natural/ Chinese therapy? I am not aware of any controlled clinical trials assessing the efficacy of "natural/chinese therapy", therefore I am not able to provide an informed opinion. It is very important to seek traditional care at the earliest since pancreatic cancer has a high mortality rate.
Perhaps. Whenever one of my patients wants to use natural or alternative therapy for a problem. I always ask them to show me exactly what it is they are taking. Some things may help, some things may really do nothing at all, but some things may have bad side effect when combine with other medicines. Your doctor can cross check your alternative medicines with whatever they order.

Had chemotherapy and surgery treatment for testicular cancer in 2007 due to that I lost my hair. My hair are less in number as they before. Cn I regain

Thinned hair. Post chemo can be permanent. I would consult a dermatologist. Try rogain (minoxidil). Risk the hair-treatment cost folks. I am pleased and congratulate you on your 6 year survival. Male pattern baldness can be related to familial traits but also testosterone. There is no cancer recurrence risk in pursing these issues.