{
  "slug": "testicular-cancer-young-men",
  "question": "What are the odds of testicular cancer in men under 35?",
  "category": "cancer",
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Testicular cancer sits in a strange perceptual gap. Most men under 35 have heard the phrase but cannot name a single person who had it, and self- examination campaigns — where they exist — tend to produce more anxiety than calibration. The disease is simultaneously \"the most common cancer in young men\" (a fact that sounds alarming) and \"extremely treatable\" (a fact that neutralises the alarm). The net effect is that most young men dramatically underestimate how common it is while overestimating how deadly it is, producing a perceived risk that is directionally wrong on both axes.\n",
    "kind": "intuition"
  },
  "native": {
    "display": "~9,810 new cases per year in US males",
    "numerator": 9810,
    "denominator": 335000000,
    "unit": "per year",
    "population": "US residents (male)"
  },
  "normalized": {
    "lifetime_us_adult": 0.004,
    "display": "~1 in 250 lifetime (US men)",
    "log_value": -2.4,
    "assumptions": "SEER data (2021-2023) reports a lifetime risk of approximately 0.4% (1 in 250) for US males. This is an age-adjusted actuarial figure integrating age-specific incidence rates over a full lifespan, not a simple annual-rate compound. The annual incidence of ~9,810 new cases (ACS 2026 estimate) against ~168 million US males gives a crude annual rate of ~0.0000584, but the SEER lifetime figure is preferred because testicular cancer has a sharply age-dependent incidence curve peaking at 20-34. The 5-year relative survival rate exceeds 95%, so the lifetime probability of dying from testicular cancer is far lower — approximately 1 in 5,000.\n",
    "uncertainty": {
      "low": 0.003,
      "high": 0.005
    },
    "scope": "subgroup_lifetime"
  },
  "sources": [
    {
      "url": "https://seer.cancer.gov/statfacts/html/testis.html",
      "title": "Cancer Stat Facts: Testicular Cancer",
      "publisher": "National Cancer Institute — Surveillance, Epidemiology, and End Results (SEER) Program",
      "source_type": "govt_report",
      "statistic": "Approximately 0.4% of men will be diagnosed with testicular cancer at some point during their lifetime, based on 2021-2023 data",
      "excerpt": "\"Approximately 0.4 percent of men will be diagnosed with testicular cancer at some point during their lifetime, based on 2021–2023 data. The rate of new cases of testicular cancer was 6.1 per 100,000 men per year based on 2019–2023 cases. Testicular cancer is most frequently diagnosed among men aged 20–34.\"\n",
      "source_date": "2025-01-15",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20260312150046/https://seer.cancer.gov/statfacts/html/testis.html",
      "calculation_notes": "SEER's 0.4% lifetime risk is the primary normalized figure. It is derived from age-specific incidence rates applied to the US male life table, making it more accurate than a simple compound of the crude annual rate. The 6.1 per 100,000 age-adjusted annual incidence rate corroborates the native numerator: 6.1 × 1,680 (per 100K males) ≈ 10,248, consistent with the ACS 2026 estimate of 9,810 new cases.\n"
    },
    {
      "url": "https://www.cancer.org/cancer/types/testicular-cancer/about/key-statistics.html",
      "title": "Key Statistics for Testicular Cancer",
      "publisher": "American Cancer Society",
      "source_type": "reputable_reference",
      "statistic": "About 9,810 new cases and 630 deaths estimated for 2026; about 1 in 250 males will develop testicular cancer in their lifetime",
      "excerpt": "\"The American Cancer Society's estimates for testicular cancer in the United States for 2026 are: About 9,810 new cases of testicular cancer diagnosed. About 630 deaths from testicular cancer. Testicular cancer is not common: about 1 of every 250 males will develop testicular cancer at some point during their lifetime. The average age at the time of diagnosis of testicular cancer is about 33. Because testicular cancer usually can be treated successfully, a man's lifetime risk of dying from this cancer is very low: about 1 in 5,000.\"\n",
      "source_date": "2026-01-01",
      "source_accessed": "2026-04-24",
      "archive_url": "http://web.archive.org/web/20260417073820/https://www.cancer.org/cancer/types/testicular-cancer/about/key-statistics.html",
      "calculation_notes": "ACS independently confirms the 1-in-250 lifetime risk and provides the 2026 case/death estimates. The 1-in-5,000 lifetime mortality risk implies a case-fatality ratio of roughly 6.4% over the full disease course (250/5000), consistent with the >95% 5-year survival reported by SEER. Used here as corroboration of both the incidence and the high-survivability framing.\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Lifetime prostate cancer (US male)",
      "lifetime_us_adult": 0.126
    },
    {
      "label": "Lifetime melanoma (US adult)",
      "lifetime_us_adult": 0.027
    },
    {
      "label": "Lifetime death from testicular cancer (US male)",
      "lifetime_us_adult": 0.0002
    }
  ],
  "short_label": "Testicular cancer",
  "myth_framing": "underrated",
  "outcome_severity": "serious_harm",
  "exposure_pattern": "recurring",
  "outcome_type": "chronic_illness",
  "valence": "negative",
  "caveats": "The 0.4% lifetime risk applies to all US males across a full lifespan. Risk is not uniformly distributed by age: incidence peaks sharply between ages 20 and 34, making the conditional probability for a man currently in that window higher than the all-ages figure suggests. Conversely, a man who reaches 45 without a diagnosis has effectively passed through the highest-risk window. Cryptorchidism (undescended testicle) raises individual risk 4-8x; family history roughly doubles it. The 1-in-250 figure is for diagnosis, not death — the lifetime mortality risk of ~1 in 5,000 reflects the >95% curability with modern treatment. SEER data may slightly undercount cases in uninsured or undocumented populations.\n",
  "quality_score": {
    "d1": 4,
    "d2": 5,
    "d3": 5,
    "d4": 4,
    "d5": 5,
    "d6": 5,
    "d7": 4,
    "d8": 5,
    "avg": 4.625,
    "scored_by": "claude-code-8d",
    "scored_at": "2026-05-25",
    "methodology_version": "1.2"
  },
  "reviewer": "8d-eval-2026-05-16",
  "last_reviewed": "2026-05-16",
  "reviewed": true,
  "generated_at": "2026-04-24",
  "image": {
    "alt": "A flat vector illustration of an abstract circular cell shape with a subtle awareness ribbon, rendered in muted blue-grey tones."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "support": "https://buymeacoffee.com/kgluszczyk?via=likelier&utm_content=api-fear-single",
  "canonical_url": "https://likelier.app/testicular-cancer-young-men"
}