Early Warning Signs of Cancer: Organ-by-Organ Red Flags

The early warning signs of cancer include a non-healing mouth ulcer, a cough that resists treatment, early satiety, jaundice, a change in bowel habit and rectal bleeding. Dr. Rajesh Kumar Jain, Principal Director - Surgical Oncology, BLK-Max Super Speciality Hospital, New Delhi, India, holds that awareness and a high index of clinical suspicion catch them early, when cancer is still curable.

He reduces the problem to a simple rule. A cancer diagnosed at stage 1 or 2 translates into cure; at stage 4, the chances of cure are very minimal, whatever the cancer. Early cancer detection needs no special equipment, and everything else in this article is about moving the diagnosis earlier.

The question came from the realities of practice across sub-Saharan Africa, where general practitioners carry much of the clinical load and specialists are scarce. Breast cancer has a well-understood warning sign: a lump. Cancers of the stomach, liver, pancreas, bowel or lung do not. Dr. Jain answered with an organ-by-organ tour, weighted towards the gastrointestinal tract, of the symptoms that should make any doctor think of cancer, starting at the mouth and working down. The rest of the masterclass, including breast cancer protocols and advances in precision oncology, is in the complete guide to recent trends in surgical oncology.

Why cancer patients are referred late

Where facilities are limited and public education is low, patients present late: that is Dr. Jain's diagnosis of the problem. The question put to him was that many cancer patients referred from abroad to surgical oncology teams arrive with advanced disease, when the case has moved into the domain of medical oncology and the objective has shifted from cure to palliation. His remedy has three parts: awareness, awareness and awareness. It must reach three audiences: doctors, the general population and the government.

Evidence that awareness shifts the stage at diagnosis

Over almost 30 years of surgical oncology practice, Dr. Jain and his team have run thousands of cancer-awareness camps across India, Nepal, Bhutan and Bangladesh, working with non-governmental organisations. The camps explain to the public what cancer is, how it is diagnosed, how it can be prevented and what screening involves. His team also lectures general practitioners and medical officers working in rural medicine.

The result, in his experience, is a reversal of the stage distribution. When he started practice in about 1997, around 75 to 80 per cent of patients presented in stage 3 or 4. Today, at least in metropolitan India, around 60 per cent present at an early stage. Awareness work needs trained people and organisation, not special equipment, and he hopes African countries can achieve the same shift through awareness at every level.

Cancer warning signs the public should know

The public messages are simple. Anyone with:

• a lump in the breast,
• postmenopausal bleeding,
• unexplained weight loss,
• bleeding from the rectum, or
• a persistent, unexplained fever

should seek a medical opinion promptly and should not assume the cause is benign.

Early warning signs of cancer, organ by organ

The second tool is clinical suspicion: each organ has red flag symptoms that should make any doctor think of cancer. For Dr. Jain, a high index of clinical suspicion is the key to early cancer diagnosis. His tour of the body follows.

Oral cancer: a non-healing ulcer in a tobacco user

A smoker or tobacco user with an ulcer or small lesion in the oral cavity, on the tongue or in the cheek (buccal mucosa) that has not healed in 15 to 20 days should be suspected of having oral cancer. Without any doubt, that patient should undergo a biopsy. This applies to any doctor with a basic medical qualification: a history of 20 days, a month or two months of a non-healing ulcer or lesion is enough to act on.

Laryngeal and oesophageal cancer: voice change and difficulty swallowing

A change of voice lasting more than three weeks, with no response to conservative treatment, should raise suspicion of cancer of the larynx. So should dysphagia, difficulty in swallowing, which points to the pharynx or oesophagus.

Lung cancer: the cough that does not respond to treatment

A cough is usually treated as a respiratory tract infection, and in developing countries a cough that has not responded after three or four weeks is often treated as tuberculosis. Dr. Jain's minimum standard is a plain chest X-ray, which is available everywhere and can give the first hint of cancer.

The trap is the empirical tuberculosis trial. If a patient with suspected tuberculosis has received four or five weeks of anti-tubercular treatment and is not responding, suspect cancer. A nagging cough that does not respond to general treatment should make the doctor suspect cancer.

Stomach cancer: early satiety and persistent dyspepsia

Dr. Jain singles out one symptom of stomach cancer that doctors should never forget: early satiety. A man who used to eat four or five pieces of bread now feels full after half a piece or one piece, or after a spoonful of ice cream or two sips of juice. That early fullness is classical of stomach cancer.

The second gastric warning sign is persistent dyspepsia, or indigestion. Patients and doctors attribute burning and discomfort to acidity or gastritis. If symptoms continue for more than four or five weeks, the patient should consult a doctor, have at least an ultrasound and, where endoscopy is available, undergo one.

Pancreatic and liver cancer: weight loss, appetite and fatigue

Unexplained loss of weight and unexplained loss of appetite should raise suspicion of pancreatic or liver cancer. So should easy fatigability: a patient who used to walk two or three kilometres a day without difficulty now feels exhausted after 10 or 15 steps, with no other explanation.

Jaundice: when to suspect pancreatic, gallbladder or liver cancer

Dr. Jain warns that doctors make mistakes here. A patient presents with jaundice, the doctor assumes hepatitis A, B or C, and conservative treatment begins. Testing for hepatitis and the usual causes of jaundice is necessary, but not sufficient. His rule is absolute: every patient with jaundice should have at least an ultrasound of the abdomen.

The reason is the list of cancers that present with jaundice:

• carcinoma of the pancreas,
• carcinoma of the gallbladder,
• carcinoma of the common bile duct, and
• carcinoma of the liver.

A single ultrasound lets the doctor say with confidence whether the jaundice is caused by cancer or by infection.

Colon cancer: a change in bowel habit

Everyone has a fixed bowel habit: once a day in the morning, twice a day, or some other personal pattern. Any change from that pattern should prompt investigation: unexplained diarrhoea or unexplained constipation. These are the warning signs of colon cancer.

Rectal bleeding: piles or cancer?

Not every rectal bleed is piles. When a patient presents with bleeding per rectum, almost everyone assumes haemorrhoids. Haemorrhoids are indeed the commonest cause of rectal bleeding, but rectal cancer, anal canal cancer and colonic cancer can all bleed. Dr. Jain has seen many patients treated for piles who were ultimately diagnosed with rectal cancer.

His minimum standard: put a finger in and perform a digital rectal examination. Where facilities exist, perform a sigmoidoscopy or colonoscopy.

Testicular cancer: a painless swelling in a young male

A swelling of one testicle is easily labelled infection or a hydrocele. Dr. Jain warns against doing so, especially when the swelling is painless and the patient is a boy or young adult; his examples ran from 8 to 25 years of age. Testicular cancer is most common in men aged about 15 to 35. A simple ultrasound of the scrotum distinguishes a hydrocele, a hernia and a testicular tumour. Do not diagnose a hydrocele on examination alone.

Soft tissue sarcoma: the lump that keeps growing

A soft tissue swelling is easily dismissed as a lipoma, a benign fatty lump. If it is gradually increasing in size, it may be a sarcoma, a cancer of connective tissue. A lump that is growing, deep, painful or larger than 5 cm needs an urgent ultrasound and, if it remains suspicious, a core needle biopsy, ideally planned with a sarcoma team. Fine-needle aspiration cytology (FNAC), in which a thin needle draws cells for examination, is not adequate on its own to diagnose a primary sarcoma.

When a doctor should suspect cancer: the two tools

Dr. Jain's message to general practitioners reduces to two tools that need no capital investment:

1. Awareness, awareness, awareness: among the public, among doctors and among governments, so that patients present while cure is still possible.
2. Suspicion, suspicion, suspicion: a doctor who keeps cancer on the differential for a non-healing ulcer, a persistent cough, early satiety, jaundice, a change in bowel habit or rectal bleeding will find it earlier.

The investigations he asks for are basic and widely available: biopsy, chest X-ray, ultrasound, endoscopy where possible, digital rectal examination and needle biopsy. What they require is the decision to look.

From suspicion to staging

Once suspicion is confirmed by biopsy, staging follows. For centres without PET-CT, Dr. Jain's fallback sequence (bone scan or skeletal survey for bone, CT or ultrasound for the liver, CT or chest X-ray for the lungs) is described in the article on the breast cancer treatment protocol by stage and subtype. The same logic applies to any solid tumour: use the best investigation available, and do not let the absence of the ideal one delay the diagnosis.

Organising cancer awareness camps at scale

Dr. Jain's camps model rests on partnership: non-governmental organisations provide reach into communities, clinicians provide the content, and professional networks connect doctors across countries. He regards platforms that bring Indian specialists together with African doctors as part of the same effort, and his offer to the doctors in the session was open: online or in person, his team is available to help close the gap between early and late diagnosis. The questions doctors raised in the session are on the masterclass Live Discussion.