If you or someone close to you has been diagnosed with cancer that has spread to the peritoneum — from the colon, ovary, stomach or appendix — with peritoneal mesothelioma or with a sarcoma, this is where to find what can be done, with the published results, and how to request a second opinion with your scans in hand.
Pablo Lozano Lominchar, MD, PhD, EBPSM
Peritoneal surface malignancy, sarcoma and complex pelvic surgery · Hospital Gregorio Marañón
Start from your diagnosis
Each page explains the disease in the patient's language, with published results and their sources, and ends by saying when a second opinion is worth seeking.
Peritoneum
Sarcoma
Before deciding
Second opinion
Seeking a second opinion is not a vote of no confidence. In peritoneal disease and sarcoma it is the reasonable thing to do: these are rare diseases and the team's experience changes the outcome. The answer may be yes to surgery, no, or that something is needed before deciding. All three are useful.
Imaging in digital form — the full study, not just the report — plus the pathology and the surgical and oncology reports, with dates.
The documentation is studied before the visit, so the consultation is spent on decisions rather than on reading paperwork.
With a concrete conclusion: whether surgery is indicated, whether it is not, or what is missing before deciding. Follow-up is coordinated with your own doctor.
Clinical Expertise
Comprehensive management of peritoneal carcinomatosis from colorectal, ovarian, gastric, and appendiceal origins using CRS+HIPEC. 15 years of experience in the first group for this disease founded in Madrid.
Expert compartmental resection of retroperitoneal soft tissue sarcomas including WDLPS, DDLPS, and LMS. Complex multivisceral procedures.
Read about retroperitoneal sarcoma →Cytoreductive surgery with hyperthermic intraperitoneal chemotherapy. 50–60 procedures per year at a high-volume centre.
The operation, step by step →Recurrent pelvic tumours, sacral chordoma, pelvic reconstruction. Multidisciplinary approach.
For patients
Peritoneal carcinomatosis, sarcoma, HIPEC, palliative surgery, recovery, and FAQs — explained in plain language.
New · A book for patients
Peritoneal carcinomatosis and peritoneal metastases: why one patient is offered surgery and another is not
You have been told you have peritoneal carcinomatosis. You searched online and found figures you could not place, from studies with no date on them. This book sorts them out.
In 2003, a patient with peritoneal metastases from colorectal cancer lived a median of twelve months. In 2021, the operable patients in the PRODIGE 7 trial were past forty. None of that existed when the person treating you began training.
Written without compassion and without euphemism, for an adult reader who does not know medicine but does know how to read. Every figure comes from a published study and carries its full citation at the back, so you can check it or take it to your doctor.
This is not medical advice and does not replace your team. It exists to make the conversation with your doctor better.
International collaboration
Peritoneal carcinomatosis is uncommon in any single centre. No hospital accrues enough cases on its own to answer the questions that matter, which is why this work is done as a network.
In July 2026, took part in Beijing in the programme behind the creation of the International Research Center for Peritoneal Surface Oncology (IRCPSO) at Tsinghua University, alongside teams from China, Japan, the Netherlands, Spain and India. The appointment as Distinguished Adjunct Expert of the centre followed.
International appointment · 2026
International Research Center for Peritoneal Surface Oncology (IRCPSO)
Beijing Tsinghua Changgung Hospital · Tsinghua University · Beijing, China
The IRCPSO is the centre Tsinghua University has created to bring together the world's research on peritoneal surface malignancy. The appointment means standing participation in its multicentre projects, registries and trials.
Your experience
If you have been a patient, worked with me in theatre or on a tumour board, or taken one of the courses, I want to hear it: what worked, what did not, and what was missing. Everything gets read.
Nothing is published on this site. If a comment were ever to be quoted, permission would be asked for in writing first. Please do not include clinical details or other people's data.
For surgeons and residents
My own project
A platform for preparing surgical certification exams: a bank of more than 10,000 questions, every answer explained and referenced to a guideline, an oral exam simulator that questions you back, and a study plan matched to the specific board you are sitting.
I write it myself, as a practising surgical oncologist — not a content agency. Every question comes out of practice and is referenced to NCCN, ESMO, ESSO, PSOGI or JGCA, so what is learned is the reasoning, not the key.
50-question free trial · no credit card · no auto-renewal
Surgical oncology, HPB, coloproctology, endocrine, breast, oesophagogastric, bariatric and transplant.
The book
Surgical Oncology Board Review
A board review manual for surgical oncology: exam pearls, the trials that changed practice, TNM staging and questions with commented answers, in a single volume.
It was not born in an office but at Memorial Sloan Kettering Cancer Center, operating on retroperitoneal sarcoma and peritoneal malignant disease, and was finished at Hospital Gregorio Marañón.
Authors
Pablo Lozano Lominchar, MD, PhD, EBPSM
Luis González Bayón, MD, PhD
With Juan Carbonell, MD
574-page paperback (21.6 × 27.9 cm) and Kindle edition, both on Amazon.
Digital projects
Training & affiliations
In peritoneal disease and sarcoma, the criteria that rule surgery out are not those of other tumours. An honest review of the case can change the plan, or confirm it and put the doubt to rest.